--- title: "Washington to Posadas cheap flights from $1,309 (IAD to PSS) - Expedia" description: "Cheap Flights from Washington (IAD) to Posadas (PSS) start at $1,309 for one-way and $1,374 for round trip. Earn your airline miles on top of our rewards!" canonical: "https://www.expedia.com/lp/flights/iad/pss/washington-to-posadas" language: en-US market: US currency: USD prices_as_of: 2026-11-14T06:22:59Z --- # $1,309 Cheap Flights from Washington (IAD) to Posadas (PSS) ![A natural rock arch formation in turquoise waters with a mountainous backdrop.](https://images.trvl-media.com/place/2887/d836a022-182c-4be3-ade6-4b3bb9158f9d.jpg?impolicy=fcrop&w=1200&h=500&q=medium) [View $1,309 flight on Mon, Jan 4, 2027](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:1/4/2027TANYT&trip=oneway&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:1308.60&airProductToken=AQqWAQoyCMGsARIDMTQ5GIgYIMEzKOrNoQMwr9ChAzhIQABYAWoHQ0xBU1NJQ3IISEVPQjJCUlMKMgjBrAESAzE1NRjBMyCAeSiH1aEDMIjYoQM4SEABWAFqB0NMQVNTSUNyCEhFT0IyQlJTCiwIwaQBEgQxNzYyGIB5IM-UASij2aEDMIfaoQM4TUABWAFqAkVGcgVNMlVFRhIKCAEQARgBKgJBVhgBIgQIARABKAIoAygEMAE) ## Popular airlines from Washington Dulles Intl. Airport (IAD) to Posadas (PSS-Libertador General Jose de San Martin) [American Airlines](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:11/28/2026TANYT&leg2=from:PSS,to:IAD,departure:12/5/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) [United](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:11/28/2026TANYT&leg2=from:PSS,to:IAD,departure:12/5/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) [Southwest Airlines](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:11/28/2026TANYT&leg2=from:PSS,to:IAD,departure:12/5/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) [Delta](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:11/28/2026TANYT&leg2=from:PSS,to:IAD,departure:12/5/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) [Frontier Airlines](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:11/28/2026TANYT&leg2=from:PSS,to:IAD,departure:12/5/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F9"}}]) [JetBlue Airways](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:11/28/2026TANYT&leg2=from:PSS,to:IAD,departure:12/5/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"B6"}}]) [Alaska Airlines](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:11/28/2026TANYT&leg2=from:PSS,to:IAD,departure:12/5/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) ### Be in the know Get alerts if flight prices drop or rise\* ### Book smarter Save up to 30% on select hotels after you book a flight\* ### Earn twice Earn your airline miles on top of our OneKeyCash [Learn about One Key](https://www.expedia.com/welcome-one-key) ## Cheap Flights from Washington to Posadas (IAD-PSS) Prices were available within the past 7 days and start at $1,309 for one-way flights and $1,374 for roundtrip, for the period specified. Prices and availability are subject to change. All deals One way Roundtrip [Select Avianca flight, departing Wed, Feb 3 from Washington to Posadas, returning Tue, Feb 16, priced at $1,374 Found 4 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:2/3/2027TANYT&leg2=from:PSS,to:IAD,departure:2/16/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:1373.09&airProductToken=AQqXAQoyCMGsARIDMTQ5GIgYIMEzKKqfpAMw76GkAzhTQABYAWoHQ0xBU1NJQ3IIU0VBQjJCUlMKMwjBrAESBDgzOTUYwTMgpCYomqukAzCgrqQDOFNAAVgBagdDTEFTU0lDcghTRUFCMkJSUwosCMGkARIEMTc2OBikJiDPlAEohrCkAzDqsKQDOE1AAVgBagJFRnIFTTJVRUYKlgEKLAjBpAESBDE3NjkYz5QBIIB5KI24pQMw8bilAzhNQABYAWoCRUZyBU0yVUVGCjIIwawBEgMxNTQYgHkgwTMovbylAzC-v6UDOFdAAVgBagdDTEFTU0lDcghXRUFCMkJSUwoyCMGsARIDMTQ4GMEzIIgYKObEpQMwuselAzhXQAFYAWoHQ0xBU1NJQ3IIV0VBQjJCUlMSCggBEAEYASoCQVYYASIECAEQASgCKAMoBDAB) Wed, Feb 3 - Tue, Feb 16 · IAD · PSS · Roundtrip [Select Avianca flight, departing Wed, Feb 3 from Washington to Posadas, returning Tue, Feb 16, priced at $1,560 Found 4 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:2/3/2027TANYT&leg2=from:PSS,to:IAD,departure:2/16/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:1559.09&airProductToken=AQqWAQoyCMGsARIDMTQ5GIgYIMEzKKqfpAMw76GkAzhLQABYAWoHQ0xBU1NJQ3IIS0VBQjJCUlMKMgjBrAESAzE1NRjBMyCAeSjHpqQDMMippAM4S0ABWAFqB0NMQVNTSUNyCEtFQUIyQlJTCiwIwaQBEgQxNzY0GIB5IM-UASjErKQDMKitpAM4TUABWAFqAkVGcgVNMlVFRgqWAQosCMGkARIEMTc2ORjPlAEggHkojbilAzDxuKUDOE1AAFgBagJFRnIFTTJVRUYKMgjBrAESAzE1NBiAeSDBMyi9vKUDML6%5FpQM4V0ABWAFqB0NMQVNTSUNyCFdFQUIyQlJTCjIIwawBEgMxNDgYwTMgiBgo5sSlAzC6x6UDOFdAAVgBagdDTEFTU0lDcghXRUFCMkJSUxIKCAEQARgBKgJBVhgBIgQIARABKAIoAygEMAE) Wed, Feb 3 - Tue, Feb 16 · IAD · PSS · Roundtrip [Select Avianca flight, departing Wed, Feb 3 from Washington to Posadas, returning Tue, Feb 16, priced at $1,607 Found 4 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:2/3/2027TANYT&leg2=from:PSS,to:IAD,departure:2/16/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:1606.09&airProductToken=AQqWAQoyCMGsARIDMjQ3GIgYIMEzKLKjpAMwhqakAzhFQABYAWoHQ0xBU1NJQ3IIRUVBQjJCUlMKMgjBrAESAzE1NRjBMyCAeSjHpqQDMMippAM4RUABWAFqB0NMQVNTSUNyCEVFQUIyQlJTCiwIwaQBEgQxNzY0GIB5IM-UASjErKQDMKitpAM4TUABWAFqAkVGcgVNMlVFRgqWAQosCMGkARIEMTc2ORjPlAEggHkojbilAzDxuKUDOE1AAFgBagJFRnIFTTJVRUYKMgjBrAESAzE1NBiAeSDBMyi9vKUDML6%5FpQM4V0ABWAFqB0NMQVNTSUNyCFdFQUIyQlJTCjIIwawBEgMxNDgYwTMgiBgo5sSlAzC6x6UDOFdAAVgBagdDTEFTU0lDcghXRUFCMkJSUxIKCAEQARgBKgJBVhgBIgQIARABKAIoAygEMAE) Wed, Feb 3 - Tue, Feb 16 · IAD · PSS · Roundtrip [Select Avianca flight, departing Sun, Mar 21 from Washington to Posadas, returning Wed, Mar 24, priced at $1,850 Found 6 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:3/21/2027TANYT&leg2=from:PSS,to:IAD,departure:3/24/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:1849.09&airProductToken=AQqWAQoyCMGsARIDMTQ5GIgYIMEzKOqkqAMwr6eoAzhIQABYAWoHQ0xBU1NJQ3IISEVBQjJCUlMKMgjBrAESAzE1NRjBMyCAeSiHrKgDMIivqAM4SEABWAFqB0NMQVNTSUNyCEhFQUIyQlJTCiwIwaQBEgQxNzYyGIB5IM-UASi8sKgDMKCxqAM4TUABWAFqAkVGcgVNMlVFRgqVAQosCMGkARIEMTc2ORjPlAEgpCYojc2oAzDxzagDOE1AAFgBagJFRnIFTTJVRUYKMQjBrAESAjg4GKQmIMEzKNHRqAMw0tSoAzhTQAFYAWoHQ0xBU1NJQ3IIU0VBQjJCUlMKMgjBrAESAzI0NhjBMyCIGCj43agDMMLgqAM4U0ABWAFqB0NMQVNTSUNyCFNFQUIyQlJTEgoIARABGAEqAkFWGAEiBAgBEAEoAigDKAQwAQ) Sun, Mar 21 - Wed, Mar 24 · IAD · PSS · Roundtrip [Select Avianca flight, departing Sun, Mar 21 from Washington to Posadas, returning Wed, Mar 24, priced at $1,919 Found 6 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:3/21/2027TANYT&leg2=from:PSS,to:IAD,departure:3/24/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:1918.09&airProductToken=AQqWAQoyCMGsARIDMTQ5GIgYIMEzKOqkqAMwr6eoAzhIQABYAWoHQ0xBU1NJQ3IISEVBQjJCUlMKMgjBrAESAzE1NRjBMyCAeSiHrKgDMIivqAM4SEABWAFqB0NMQVNTSUNyCEhFQUIyQlJTCiwIwaQBEgQxNzY4GIB5IM-UASi8tagDMKC2qAM4TUABWAFqAkVGcgVNMlVFRgqXAQosCMGkARIEMTc2ORjPlAEgpCYojc2oAzDxzagDOE1AAFgBagJFRnIFTTJVRUYKMwjBrAESBDgzOTYYpCYgwTMohtaoAzCW2agDOFBAAVgBagdDTEFTU0lDcghQRUFCMkJSUwoyCMGsARIDMTQ4GMEzIIgYKObZqAMwutyoAzhQQAFYAWoHQ0xBU1NJQ3IIUEVBQjJCUlMSCggBEAEYASoCQVYYASIECAEQASgCKAMoBDAB) Sun, Mar 21 - Wed, Mar 24 · IAD · PSS · Roundtrip [Select Avianca flight, departing Sun, Mar 21 from Washington to Posadas, returning Wed, Mar 24, priced at $2,259 Found 6 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:3/21/2027TANYT&leg2=from:PSS,to:IAD,departure:3/24/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:2258.29&airProductToken=AQqWAQoyCMGsARIDMjQ3GIgYIMEzKPKoqAMwxquoAzhIQABYAWoHQ0xBU1NJQ3IISEVPQjJCUlMKMgjBrAESAzE1NRjBMyCAeSiHrKgDMIivqAM4SEABWAFqB0NMQVNTSUNyCEhFT0IyQlJTCiwIwaQBEgQxNzY4GIB5IM-UASi8tagDMKC2qAM4TUABWAFqAkVGcgVNMlVFRhIKCAEQARgBKgJBVhgBIgQIARABKAIoAygEMAE) Sun, Mar 21 - Wed, Mar 24 · IAD · PSS · Roundtrip [Select Avianca flight, departing Tue, Jan 5 from Washington to Posadas, returning Wed, Jan 20, priced at $2,270 Found 5 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:1/5/2027TANYT&leg2=from:PSS,to:IAD,departure:1/20/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:2269.09&airProductToken=AQqWAQoyCMGsARIDMjQ3GIgYIMEzKJLdoQMw5t-hAzhRQABYAWoHQ0xBU1NJQ3IIUUVBQjJCUlMKMgjBrAESAzIxNxjBMyCkJiiH6aEDMJLsoQM4UUABWAFqB0NMQVNTSUNyCFFFQUIyQlJTCiwIwaQBEgQxNzY4GKQmIM-UASiG9aEDMOr1oQM4TUABWAFqAkVGcgVNMlVFRgqWAQosCMGkARIEMTc2MxjPlAEggHkoj4OjAzDzg6MDOE1AAFgBagJFRnIFTTJVRUYKMgjBrAESAzE1NBiAeSDBMyjdjKMDMN6PowM4SEABWAFqB0NMQVNTSUNyCEhFQUIyQlJTCjIIwawBEgMxNDgYwTMgiBgohpWjAzDal6MDOEhAAVgBagdDTEFTU0lDcghIRUFCMkJSUxIKCAEQARgBKgJBVhgBIgQIARABKAIoAygEMAE) Tue, Jan 5 - Wed, Jan 20 · IAD · PSS · Roundtrip [Select Avianca flight, departing Tue, Jan 5 from Washington to Posadas, returning Wed, Jan 20, priced at $2,348 Found 5 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:1/5/2027TANYT&leg2=from:PSS,to:IAD,departure:1/20/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:2347.09&airProductToken=AQqWAQoyCMGsARIDMTQ5GIgYIMEzKIrZoQMwz9uhAzhIQABYAWoHQ0xBU1NJQ3IISEVBQjJCUlMKMgjBrAESAzE1NRjBMyCAeSin4KEDMKjjoQM4SEABWAFqB0NMQVNTSUNyCEhFQUIyQlJTCiwIwaQBEgQxNzY0GIB5IM-UASik5qEDMIjnoQM4TUABWAFqAkVGcgVNMlVFRgqWAQosCMGkARIEMTc2MxjPlAEggHkoj4OjAzDzg6MDOE1AAFgBagJFRnIFTTJVRUYKMgjBrAESAzE1NBiAeSDBMyjdjKMDMN6PowM4SEABWAFqB0NMQVNTSUNyCEhFQUIyQlJTCjIIwawBEgMyNDYYwTMgiBgomJmjAzDim6MDOEhAAVgBagdDTEFTU0lDcghIRUFCMkJSUxIKCAEQARgBKgJBVhgBIgQIARABKAIoAygEMAE) Tue, Jan 5 - Wed, Jan 20 · IAD · PSS · Roundtrip [Select Avianca flight, departing Fri, Jan 1 from Washington to Posadas, returning Fri, Jan 8, priced at $2,375 Found 2 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:1/1/2027TANYT&leg2=from:PSS,to:IAD,departure:1/8/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:2374.09&airProductToken=AQqWAQoyCMGsARIDMjQ3GIgYIMEzKJKwoQMw5rKhAzhBQABYAWoHQ0xBU1NJQ3IIQUVBQjJCUlMKMgjBrAESAzE1NRjBMyCAeSins6EDMKi2oQM4QUABWAFqB0NMQVNTSUNyCEFFQUIyQlJTCiwIwaQBEgQxNzY4GIB5IM-UASiUu6EDMPi7oQM4TUABWAFqAkVGcgVNMlVFRgqWAQosCMGkARIEMTc2NRjPlAEggHkok%5F6hAzD3%5FqEDOE1AAFgBagJFRnIFTTJVRUYKMgjBrAESAzE1NBiAeSDBMyjdhaIDMN6IogM4QkABWAFqB0NMQVNTSUNyCEJFQUIyQlJTCjIIwawBEgMxNDgYwTMgiBgoho6iAzDakKIDOEJAAVgBagdDTEFTU0lDcghCRUFCMkJSUxIMCAEQARgBKgJBVjIAGAEiBAgBEAEoAigDKAQwAQ) Fri, Jan 1 - Fri, Jan 8 · IAD · PSS · Roundtrip [Select Air Canada flight, departing Fri, Jan 1 from Washington to Posadas, returning Fri, Jan 8, priced at $3,779 Found 2 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:1/1/2027TANYT&leg2=from:PSS,to:IAD,departure:1/8/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:3778.29&airProductToken=AQqmAQpBCMGGARIEMzg1NxiIGCCYzgEo3bOhAzDEtKEDOEhAAFgBaghTVEFOREFSRHIISEhVUzA2VEd6CgjVggESBDM1MTUKMwjBhgESAjkwGJjOASCkJiiXv6EDMP3FoQM4SEABWAFqCFNUQU5EQVJEcghISFVTMDZURwosCMGkARIEMTc2MhikJiDPlAEonM6hAzCAz6EDOE1AAVgBagJFRnIFTTJVRUYSDAgBEAEYASoCQUMyABgBIgQIARABKAIoAygEMAE) Fri, Jan 1 - Fri, Jan 8 · IAD · PSS · Roundtrip [Select United flight, departing Fri, Dec 18 from Washington to Posadas, returning Sat, Jan 2, priced at $5,107 Found 6 days ago](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:PSS,departure:12/18/2026TANYT&leg2=from:PSS,to:IAD,departure:1/2/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:5106.19&airProductToken=AQqWAQoyCNWCARIDODYxGIgYIKakASitlqADMICboAM4TUAAWAFqBkVDT1JFRnIITU5BMEEwRVkKMgjHZhIENzY0NBimpAEggHkozJ6gAzCAoKADOE9AAVgBagZFQ09SRUZyCE1OQTBBMEVZCiwIwaQBEgQxNzYwGIB5IM-UASiMpqADMPCmoAM4WUABWAFqAkVGcgVZMlVFRhIKCAEQARgBKgJVQRgBIgQIARABKAIoBCgGMAE) Fri, Dec 18 - Sat, Jan 2 · IAD · PSS · Roundtrip ## Book with confidence ### Washington to Posadas Flights #### The cheapest times to fly from Washington to Posadas On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Posadas are during the month of February. You can find some of the cheapest flights from Washington to Posadas with Expedia's search tool and vast selection of airlines. #### The best time to book a flight from Washington to Posadas Sunday is one of the best days to book for cheap flights from Washington to Posadas: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance. #### How to find cheap round-trip tickets from Washington to Posadas Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Posadas in 2026\. You can also book with separate airlines for your outbound and return journeys, from $1,309 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference\*. This is available for a small fee, and is free to One Key Gold and Platinum tier members. Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Posadas flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps. You could also save big by booking one of Expedia's [vacation packages](https://www.expedia.com/package-deals). Bundling together your Washington to Posadas airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures. *\*Terms apply.* *Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023\. The percentages you see are averages.* ## Frequently Asked Questions ### How much does a flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) cost? You can find cheap one-way flights from $1,309 and cheap return flights $1,374 IAD to PSS with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when IAD to PSS ticket fares go up or down. ### What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)? The cheapest month to fly from IAD to PSS is February when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route. ### Which airlines fly direct from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)? Enter IAD to PSS and your travel dates, then apply the 'Nonstop' filter to see only direct flights. ### What is the cheapest airline that flies from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)? Avianca and United are just some of the carriers that fly from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin). Use Expedia's flight search tool to compare airlines on this route and find our cheapest option for your trip. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget. *\*Prices based on flights available on Expedia in the last year.* ### How do I find cheap flights from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)? To find a cheap flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up [Price Tracking](https://www.expedia.com/why/price-tracking) and receive alerts when fares go up or down. ### What is the best time to fly from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)? The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience. ### What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)? Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from IAD to PSS. To compare more early flights, use the "Early Morning" and "Morning" filters in your search. ### How long does it take to fly from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)? A flight from IAD to PSS with a layover takes around 20 hours 50 minutes, with the route covering approximately 4,789 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic. ### Can you fly business or first class from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)? Select the "Business class" and "First class" filters when looking for IAD to PSS flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip. ### How do I earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight with Expedia? It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of [One Key™](https://www.expedia.com/welcome-one-key), you can also earn OneKeyCash™\* on top of your airline miles when you book with Expedia. \*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands. ### Is it cheaper to buy a plane ticket from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) at the last minute? Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare. ### Is it cheaper to book a Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight and hotel package? Securing a Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars. ### Can I cancel or change the date of my flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)? If you booked your Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in [your itinerary](https://www.expedia.com/trips) or confirmation email. Or, head to our [Customer Service portal](https://www.expedia.com/helpcenter/) if you'd like more information. ## Travel information | Origin airport | Washington Dulles Intl. Airport | | ------------------- | ------------------------------- | | Destination airport | Posadas | | Distance | 4,788 miles away | | Roundtrip price | $1,374 | ## Explore a world of travel with Expedia - [Flights](?equalTargetTab=tab-0) - [Flights from Columbia (CAE) to Posadas (PSS)](https://www.expedia.com/lp/flights/cae/pss/columbia-to-posadas) - [Flights from Formosa (FMA) to Posadas (PSS)](https://www.expedia.com/lp/flights/fma/pss/formosa-to-posadas) - [Flights from Lima (LIM) to Posadas (PSS)](https://www.expedia.com/lp/flights/lim/pss/lima-to-posadas) - [Flights from Chicago (ORD) to Posadas (PSS)](https://www.expedia.com/lp/flights/ord/pss/chicago-to-posadas) - [Flights from Washington (DCA) to Posadas (PSS)](https://www.expedia.com/lp/flights/dca/pss/washington-to-posadas) - [Flights from Baltimore (BWI) to Posadas (PSS)](https://www.expedia.com/lp/flights/bwi/pss/baltimore-to-posadas) - [Flights from São Paulo (CGH) to Posadas (PSS)](https://www.expedia.com/lp/flights/cgh/pss/sao-paulo-to-posadas) - [Flights from Dallas (DFW) to Posadas (PSS)](https://www.expedia.com/lp/flights/dfw/pss/dallas-to-posadas) - [Flights from Detroit (DTW) to Posadas (PSS)](https://www.expedia.com/lp/flights/dtw/pss/detroit-to-posadas) - [Flights from Neuquén (NQN) to Posadas (PSS)](https://www.expedia.com/lp/flights/nqn/pss/neuquen-to-posadas) - [Flights from Colorado Springs (COS) to Posadas (PSS)](https://www.expedia.com/lp/flights/cos/pss/colorado-springs-to-posadas) - [Flights from Boston (BOS) to Posadas (PSS)](https://www.expedia.com/lp/flights/bos/pss/boston-to-posadas) - [Flights from Mar Del Plata (MDQ) to Posadas (PSS)](https://www.expedia.com/lp/flights/mdq/pss/mar-del-plata-to-posadas) - [Flights from Minneapolis (MSP) to Posadas (PSS)](https://www.expedia.com/lp/flights/msp/pss/minneapolis-to-posadas) - [Flights from Santo Domingo (SDQ) to Posadas (PSS)](https://www.expedia.com/lp/flights/sdq/pss/santo-domingo-to-posadas) - [Flights from New York (LGA) to Posadas (PSS)](https://www.expedia.com/lp/flights/lga/pss/new-york-to-posadas) - [Flights from Ushuaia (USH) to Posadas (PSS)](https://www.expedia.com/lp/flights/ush/pss/ushuaia-to-posadas) - [Flights from Philadelphia (PHL) to Posadas (PSS)](https://www.expedia.com/lp/flights/phl/pss/philadelphia-to-posadas) - [Flights from Panama City (PTY) to Posadas (PSS)](https://www.expedia.com/lp/flights/pty/pss/panama-city-to-posadas) - [Flights from La Rioja (IRJ) to Posadas (PSS)](https://www.expedia.com/lp/flights/irj/pss/la-rioja-to-posadas) - [Flights from San Martin de los Andes (CPC) to Posadas (PSS)](https://www.expedia.com/lp/flights/cpc/pss/san-martin-de-los-andes-to-posadas) - [Flights from San Francisco (SFO) to Posadas (PSS)](https://www.expedia.com/lp/flights/sfo/pss/san-francisco-to-posadas) - [Flights from Lisbon (LIS) to Posadas (PSS)](https://www.expedia.com/lp/flights/lis/pss/lisbon-to-posadas) - [Flights from Georgetown (GEO) to Posadas (PSS)](https://www.expedia.com/lp/flights/geo/pss/georgetown-to-posadas) - [Flights from Fort Lauderdale (FLL) to Posadas (PSS)](https://www.expedia.com/lp/flights/fll/pss/fort-lauderdale-to-posadas) - [Flights from Vancouver (YVR) to Posadas (PSS)](https://www.expedia.com/lp/flights/yvr/pss/vancouver-to-posadas) - [Flights from Boa Vista (BVB) to Posadas (PSS)](https://www.expedia.com/lp/flights/bvb/pss/boa-vista-to-posadas) - [Flights from Montevideo (MVD) to Posadas (PSS)](https://www.expedia.com/lp/flights/mvd/pss/montevideo-to-posadas) - [Flights from Esquel (EQS) to Posadas (PSS)](https://www.expedia.com/lp/flights/eqs/pss/esquel-to-posadas) - [Flights from Orlando (MCO) to Posadas (PSS)](https://www.expedia.com/lp/flights/mco/pss/orlando-to-posadas) - [Flights from Santa Fe (SFN) to Posadas (PSS)](https://www.expedia.com/lp/flights/sfn/pss/santa-fe-to-posadas) - [Flights from Reno (RNO) to Posadas (PSS)](https://www.expedia.com/lp/flights/rno/pss/reno-to-posadas) - [Flights from Salt Lake City (SLC) to Posadas (PSS)](https://www.expedia.com/lp/flights/slc/pss/salt-lake-city-to-posadas) - [Flights from Chapeco (XAP) to Posadas (PSS)](https://www.expedia.com/lp/flights/xap/pss/chapeco-to-posadas) - [Flights from El Calafate (FTE) to Posadas (PSS)](https://www.expedia.com/lp/flights/fte/pss/el-calafate-to-posadas) - [Flights from Belize City (BZE) to Posadas (PSS)](https://www.expedia.com/lp/flights/bze/pss/belize-city-to-posadas) - [Flights from Madison (MSN) to Posadas (PSS)](https://www.expedia.com/lp/flights/msn/pss/madison-to-posadas) - [Flights from Bariloche (BRC) to Posadas (PSS)](https://www.expedia.com/lp/flights/brc/pss/bariloche-to-posadas) - [Flights from Houston (IAH) to Posadas (PSS)](https://www.expedia.com/lp/flights/iah/pss/houston-to-posadas) - [Flights from Rio Cuarto (RCU) to Posadas (PSS)](https://www.expedia.com/lp/flights/rcu/pss/rio-cuarto-to-posadas) - [Flights from Asuncion (ASU) to Posadas (PSS)](https://www.expedia.com/lp/flights/asu/pss/asuncion-to-posadas) - [Flights from Sacramento (SMF) to Posadas (PSS)](https://www.expedia.com/lp/flights/smf/pss/sacramento-to-posadas) - [Flights from Curitiba (CWB) to Posadas (PSS)](https://www.expedia.com/lp/flights/cwb/pss/curitiba-to-posadas) - [Flights from Phoenix (PHX) to Posadas (PSS)](https://www.expedia.com/lp/flights/phx/pss/phoenix-to-posadas) - [Flights from New York (NYC) to Posadas (PSS)](https://www.expedia.com/lp/flights/nyc/pss/new-york-to-posadas) - [Flights from Tampa (TPA) to Posadas (PSS)](https://www.expedia.com/lp/flights/tpa/pss/tampa-to-posadas) - [Flights from Oklahoma City (OKC) to Posadas (PSS)](https://www.expedia.com/lp/flights/okc/pss/oklahoma-city-to-posadas) - [Flights from Toronto (YYZ) to Posadas (PSS)](https://www.expedia.com/lp/flights/yyz/pss/toronto-to-posadas) - [Flights from Córdoba (COR) to Posadas (PSS)](https://www.expedia.com/lp/flights/cor/pss/cordoba-to-posadas) - [Flights from Guayaquil (GYE) to Posadas (PSS)](https://www.expedia.com/lp/flights/gye/pss/guayaquil-to-posadas) - [Flights from San Salvador (SAL) to Posadas (PSS)](https://www.expedia.com/lp/flights/sal/pss/san-salvador-to-posadas) - [Flights from Nairobi (NBO) to Posadas (PSS)](https://www.expedia.com/lp/flights/nbo/pss/nairobi-to-posadas) - [Flights from Buenos Aires (BUE) to Posadas (PSS)](https://www.expedia.com/lp/flights/bue/pss/buenos-aires-to-posadas) - [Flights from Lafayette (LFT) to Posadas (PSS)](https://www.expedia.com/lp/flights/lft/pss/lafayette-to-posadas) - [Flights from Rosario (ROS) to Posadas (PSS)](https://www.expedia.com/lp/flights/ros/pss/rosario-to-posadas) - [Flights from Naples (NAP) to Posadas (PSS)](https://www.expedia.com/lp/flights/nap/pss/naples-to-posadas) - [Flights from Athens (ATH) to Posadas (PSS)](https://www.expedia.com/lp/flights/ath/pss/athens-to-posadas) - [Flights from Rio de Janeiro (RIO) to Posadas (PSS)](https://www.expedia.com/lp/flights/rio/pss/rio-de-janeiro-to-posadas) - [Flights from Iguazu (IGR) to Posadas (PSS)](https://www.expedia.com/lp/flights/igr/pss/iguazu-to-posadas) - [Flights from Manaus (MAO) to Posadas (PSS)](https://www.expedia.com/lp/flights/mao/pss/manaus-to-posadas) - [Flights from Cape Town (CPT) to Posadas (PSS)](https://www.expedia.com/lp/flights/cpt/pss/cape-town-to-posadas) - [Flights from Bahia Blanca (BHI) to Posadas (PSS)](https://www.expedia.com/lp/flights/bhi/pss/bahia-blanca-to-posadas) - [Flights from Iguassu Falls (IGU) to Posadas (PSS)](https://www.expedia.com/lp/flights/igu/pss/iguassu-falls-to-posadas) - [Flights from La Paz (LPB) to Posadas (PSS)](https://www.expedia.com/lp/flights/lpb/pss/la-paz-to-posadas) - [Flights from Buenos Aires (AEP) to Posadas (PSS)](https://www.expedia.com/lp/flights/aep/pss/buenos-aires-to-posadas) - [Flights from Villa Gesell (VLG) to Posadas (PSS)](https://www.expedia.com/lp/flights/vlg/pss/villa-gesell-to-posadas) - [Flights from Santa Cruz (VVI) to Posadas (PSS)](https://www.expedia.com/lp/flights/vvi/pss/santa-cruz-to-posadas) - [Flights from Newark Liberty Intl. Airport (EWR) to Posadas (PSS)](https://www.expedia.com/lp/flights/ewr/pss/newark-liberty-intl-airport-to-posadas) - [Flights from Mexico City (MEX) to Posadas (PSS)](https://www.expedia.com/lp/flights/mex/pss/mexico-city-to-posadas) - [Flights from Budapest (BUD) to Posadas (PSS)](https://www.expedia.com/lp/flights/bud/pss/budapest-to-posadas) - [Flights from Rio de Janeiro (GIG) to Posadas (PSS)](https://www.expedia.com/lp/flights/gig/pss/rio-de-janeiro-to-posadas) - [Flights from Los Angeles (LAX) to Posadas (PSS)](https://www.expedia.com/lp/flights/lax/pss/los-angeles-to-posadas) - [Flights from Mendoza (MDZ) to Posadas (PSS)](https://www.expedia.com/lp/flights/mdz/pss/mendoza-to-posadas) - [Flights from Santiago (SCL) to Posadas (PSS)](https://www.expedia.com/lp/flights/scl/pss/santiago-to-posadas) - [Flights from Springfield (SGF) to Posadas (PSS)](https://www.expedia.com/lp/flights/sgf/pss/springfield-to-posadas) - [Flights from Denver (DEN) to Posadas (PSS)](https://www.expedia.com/lp/flights/den/pss/denver-to-posadas) - [Flights from San Juan (SJU) to Posadas (PSS)](https://www.expedia.com/lp/flights/sju/pss/san-juan-to-posadas) - [Flights from Miami (MIA) to Posadas (PSS)](https://www.expedia.com/lp/flights/mia/pss/miami-to-posadas) - [Flights from Jacksonville (JAX) to Posadas (PSS)](https://www.expedia.com/lp/flights/jax/pss/jacksonville-to-posadas) - [Flights from Lansing (LAN) to Posadas (PSS)](https://www.expedia.com/lp/flights/lan/pss/lansing-to-posadas) - [Flights from Comodoro Rivadavia (CRD) to Posadas (PSS)](https://www.expedia.com/lp/flights/crd/pss/comodoro-rivadavia-to-posadas) - [Flights from Rio de Janeiro (SDU) to Posadas (PSS)](https://www.expedia.com/lp/flights/sdu/pss/rio-de-janeiro-to-posadas) - [Flights from San José (SJO) to Posadas (PSS)](https://www.expedia.com/lp/flights/sjo/pss/san-jose-to-posadas) - [Flights from Atlanta (ATL) to Posadas (PSS)](https://www.expedia.com/lp/flights/atl/pss/atlanta-to-posadas) - [Flights from Tucuman (TUC) to Posadas (PSS)](https://www.expedia.com/lp/flights/tuc/pss/tucuman-to-posadas) - [Flights from Punta Del Este (PDP) to Posadas (PSS)](https://www.expedia.com/lp/flights/pdp/pss/punta-del-este-to-posadas) - [Flights from Parana (PRA) to Posadas (PSS)](https://www.expedia.com/lp/flights/pra/pss/parana-to-posadas) - [Flights from Buenos Aires (EZE) to Posadas (PSS)](https://www.expedia.com/lp/flights/eze/pss/buenos-aires-to-posadas) - [Flights from Rome (FCO) to Posadas (PSS)](https://www.expedia.com/lp/flights/fco/pss/rome-to-posadas) - [Flights from San Antonio (SAT) to Posadas (PSS)](https://www.expedia.com/lp/flights/sat/pss/san-antonio-to-posadas) - [Flights from New York (JFK) to Posadas (PSS)](https://www.expedia.com/lp/flights/jfk/pss/new-york-to-posadas) - [Flights from Dresden (DRS) to Posadas (PSS)](https://www.expedia.com/lp/flights/drs/pss/dresden-to-posadas) - [Flights from Florianópolis (FLN) to Posadas (PSS)](https://www.expedia.com/lp/flights/fln/pss/florianopolis-to-posadas) - [Flights from Bogotá (BOG) to Posadas (PSS)](https://www.expedia.com/lp/flights/bog/pss/bogota-to-posadas) - [Flights from Raleigh (RDU) to Posadas (PSS)](https://www.expedia.com/lp/flights/rdu/pss/raleigh-to-posadas) - [Flights from Salta (SLA) to Posadas (PSS)](https://www.expedia.com/lp/flights/sla/pss/salta-to-posadas) - [Flights from Las Vegas (LAS) to Posadas (PSS)](https://www.expedia.com/lp/flights/las/pss/las-vegas-to-posadas) - [Flights from London (LHR) to Posadas (PSS)](https://www.expedia.com/lp/flights/lhr/pss/london-to-posadas) - [Flights from São Paulo (GRU) to Posadas (PSS)](https://www.expedia.com/lp/flights/gru/pss/sao-paulo-to-posadas) - [Flights from Concordia (COC) to Posadas (PSS)](https://www.expedia.com/lp/flights/coc/pss/concordia-to-posadas) \*Available to One Key members. ## Other language versions ```yaml hreflang: x-default: https://www.expedia.com/lp/flights/iad/pss/washington-to-posadas es-ES: https://www.expedia.es/lp/vuelos/iad/pss/washington-a-posadas ar: https://www.expedia.sa/lp/flights/iad/pss/washington-to-posadas pt-BR: https://www.expedia.com.br/lp/voos/iad/pss/washington-para-posadas en-US: https://www.expedia.com/lp/flights/iad/pss/washington-to-posadas ```