Title: $598 Cheap flights from Chicago to Posadas (ORD to PSS) - Expedia.com ![Rock formation "El Arco" at Lake Posadas, Argentina](https://images.trvl-media.com/place/2887/d836a022-182c-4be3-ade6-4b3bb9158f9d.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/2887/d836a022-182c-4be3-ade6-4b3bb9158f9d.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # $598 Cheap Flights from Chicago (ORD) to Posadas (PSS) [View $598 flight on Sat, Apr 18, 2026](https://expedia.com/Flights-Search?trip=oneway&leg1=from:ORD,to:PSS,departure:4/18/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:597.70&airProductToken=AQqZAQowCMGsARIDMjYzGK4cIMEzKOTdigMw1uCKAzhQQABYAWoFTElHSFRyCFBMT0IxQlJTCjEIwawBEgQ4Mzk1GMEzIKQmKL_higMwwOSKAzhQQAFYAWoFTElHSFRyCFBFTUIxQlJHCjIIwaQBEgQxNzYyGKQmIM-UASjk7IoDMMjtigM4VEABWAFqBUxJR0hUcghQRU1CMUJSRxIKCAEQARgBKgJBVhgBIgQIARABKAIoAygEMAE) ## Popular airlines from Chicago O'Hare Intl. Airport (ORD) to Posadas (PSS-Libertador General Jose de San Martin) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.com/Flights-Search?leg1=from:ORD,to:PSS,departure:3/30/2026TANYT&leg2=from:PSS,to:ORD,departure:4/6/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.com/Flights-Search?leg1=from:ORD,to:PSS,departure:3/30/2026TANYT&leg2=from:PSS,to:ORD,departure:4/6/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WN.svg) Southwest Airlines [](https://www.expedia.com/Flights-Search?leg1=from:ORD,to:PSS,departure:3/30/2026TANYT&leg2=from:PSS,to:ORD,departure:4/6/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.com/Flights-Search?leg1=from:ORD,to:PSS,departure:3/30/2026TANYT&leg2=from:PSS,to:ORD,departure:4/6/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_F9.svg) Frontier Airlines [](https://www.expedia.com/Flights-Search?leg1=from:ORD,to:PSS,departure:3/30/2026TANYT&leg2=from:PSS,to:ORD,departure:4/6/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F9"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_B6.svg) JetBlue Airways [](https://www.expedia.com/Flights-Search?leg1=from:ORD,to:PSS,departure:3/30/2026TANYT&leg2=from:PSS,to:ORD,departure:4/6/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"B6"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AS.svg) Alaska Airlines [](https://www.expedia.com/Flights-Search?leg1=from:ORD,to:PSS,departure:3/30/2026TANYT&leg2=from:PSS,to:ORD,departure:4/6/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) - ![](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* - ![](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* - ![](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### 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 Chicago to Posadas (ORD-PSS) Prices were available within the past 7 days and start at $598 for one-way flights and $3,405 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![avianca](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/av.gif) Sat, Dec 5 - Sat, Dec 19 ORD Chicago PSS Posadas $3,405 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:12/5/2026TANYT&leg2=from:PSS,to:ORD,departure:12/19/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:3404.93&airProductToken=AQqWAQoyCMGsARIDMjYzGK4cIMEzKMSEnwMwtoefAzhCQABYAWoHQ0xBU1NJQ3IIQkxPQjJCUlMKMgjBrAESAzE1NRjBMyCAeSjnjp8DMOiRnwM4QkABWAFqB0NMQVNTSUNyCEJMT0IyQlJTCiwIwaQBEgQxNzYyGIB5IM-UASick58DMICUnwM4TUABWAFqAkVGcgVNMlVFRgqWAQosCMGkARIEMTc2MRjPlAEggHkohZugAzDpm6ADOE1AAFgBagJFRnIFTTJVRUYKMgjBrAESAzE1NBiAeSDBMyjYpKADMM-noAM4WUABWAFqB0NMQVNTSUNyCFlIT0IyQlJTCjIIwawBEgMyNjIYwTMgrhwopqmgAzCsrKADOFlAAVgBagdDTEFTU0lDcghZSE9CMkJSUxIKCAEQARgBKgJBVhgBIgQIARABKAIoAygEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,152 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4151.03&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQxGKakASCAeSiY9IgDMMz1iAM4S0ABWAFqAkVGcgVLTDJFRgosCMGkARIEMTc2MhiAeSDPlAEo0f-IAzC1gIkDOEtAAVgBagJFRnIFS0wyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIISE5BMEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4SEABWAFqB0VDT05PTVlyCEhOQTBBMEVOCjMI1YIBEgQyMTgyGIg4IK4cKITEiQMwqcWJAzhIQAFYAWoHRUNPTk9NWXIISE5BMEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,168 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4167.92&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQxGKakASCAeSiY9IgDMMz1iAM4S0ABWAFqAkVGcgVLTDJFRgosCMGkARIEMTc2MhiAeSDPlAEo0f-IAzC1gIkDOEtAAVgBagJFRnIFS0wyRUYKngEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIISE5BMEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4SEABWAFqB0VDT05PTVlyCEhOQTBBMEVOCjII1YIBEgM3ODcYiDggrhwo-cqJAzCZzIkDOEhAAVgBagdFQ09OT01ZcghITkEwQTBFThIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,224 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4223.03&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQxGKakASCAeSiY9IgDMMz1iAM4VUABWAFqAkVGcgVVTDJFRgosCMGkARIEMTc2OBiAeSDPlAEo4fiIAzDF-YgDOFVAAVgBagJFRnIFVUwyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIISE5BMEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4SEABWAFqB0VDT05PTVlyCEhOQTBBMEVOCjMI1YIBEgQxNjE3GIg4IK4cKMPEiQMw58WJAzhIQAFYAWoHRUNPTk9NWXIISE5BMEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,240 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4239.92&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQxGKakASCAeSiY9IgDMMz1iAM4VUABWAFqAkVGcgVVTDJFRgosCMGkARIEMTc2NBiAeSDPlAEovPeIAzCg-IgDOFVAAVgBagJFRnIFVUwyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIISE5BMEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4SEABWAFqB0VDT05PTVlyCEhOQTBBMEVOCjMI1YIBEgQyNDQ5GIg4IK4cKKHLiQMwwsyJAzhIQAFYAWoHRUNPTk9NWXIISE5BMEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,293 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4292.03&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQ3GKakASCAeSjk7YgDMJjviAM4TUABWAFqAkVGcgVNTDJFRgosCMGkARIEMTc2OBiAeSDPlAEo4fiIAzDF-YgDOE1AAVgBagJFRnIFTUwyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIISE5BMEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4SEABWAFqB0VDT05PTVlyCEhOQTBBMEVOCjMI1YIBEgQyMTgyGIg4IK4cKITEiQMwqcWJAzhIQAFYAWoHRUNPTk9NWXIISE5BMEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,309 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4308.92&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQ3GKakASCAeSjk7YgDMJjviAM4TUABWAFqAkVGcgVNTDJFRgosCMGkARIEMTc2OBiAeSDPlAEo4fiIAzDF-YgDOE1AAVgBagJFRnIFTUwyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIISE5BMEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4SEABWAFqB0VDT05PTVlyCEhOQTBBMEVOCjMI1YIBEgQxOTk0GIg4IK4cKJjOiQMwvM-JAzhIQAFYAWoHRUNPTk9NWXIISE5BMEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,371 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4370.03&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQ3GKakASCAeSjk7YgDMJjviAM4QkABWAFqAkVGcgVCTDJFRgosCMGkARIEMTc2NBiAeSDPlAEovPeIAzCg-IgDOEJAAVgBagJFRnIFQkwyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIISE5BMEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4SEABWAFqB0VDT05PTVlyCEhOQTBBMEVOCjMI1YIBEgQyMTgyGIg4IK4cKITEiQMwqcWJAzhIQAFYAWoHRUNPTk9NWXIISE5BMEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,372 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4371.03&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQxGKakASCAeSiY9IgDMMz1iAM4S0ABWAFqAkVGcgVLTDJFRgosCMGkARIEMTc2MhiAeSDPlAEo0f-IAzC1gIkDOEtAAVgBagJFRnIFS0wyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIIVU5BNEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4VUABWAFqB0VDT05PTVlyCFVOQTRBMEVOCjMI1YIBEgQyMTI0GIg4IK4cKKvFiQMw1caJAzhVQAFYAWoHRUNPTk9NWXIIVU5BNEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,387 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4386.92&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQ3GKakASCAeSjk7YgDMJjviAM4QkABWAFqAkVGcgVCTDJFRgosCMGkARIEMTc2NBiAeSDPlAEovPeIAzCg-IgDOEJAAVgBagJFRnIFQkwyRUYKngEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIISE5BMEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4SEABWAFqB0VDT05PTVlyCEhOQTBBMEVOCjII1YIBEgM3ODcYiDggrhwo-cqJAzCZzIkDOEhAAVgBagdFQ09OT01ZcghITkEwQTBFThIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,391 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4390.28&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQxGKakASCAeSiY9IgDMMz1iAM4S0ABWAFqAkVGcgVLTDJFRgosCMGkARIEMTc2MhiAeSDPlAEo0f-IAzC1gIkDOEtAAVgBagJFRnIFS0wyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIIVU5BNEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4VUABWAFqB0VDT05PTVlyCFVOQTRBMEVOCjMI1YIBEgQyMTk3GIg4IK4cKKzJiQMw18qJAzhVQAFYAWoHRUNPTk9NWXIIVU5BNEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,444 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4443.03&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQxGKakASCAeSiY9IgDMMz1iAM4VUABWAFqAkVGcgVVTDJFRgosCMGkARIEMTc2OBiAeSDPlAEo4fiIAzDF-YgDOFVAAVgBagJFRnIFVUwyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIIVU5BNEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4VUABWAFqB0VDT05PTVlyCFVOQTRBMEVOCjMI1YIBEgQyMTI0GIg4IK4cKKvFiQMw1caJAzhVQAFYAWoHRUNPTk9NWXIIVU5BNEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Mar 27 - Fri, Apr 3 ORD Chicago PSS Posadas $4,463 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:3/27/2026TANYT&leg2=from:PSS,to:ORD,departure:4/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4462.28&airProductToken=AQqRAQozCNWCARIDODQ1GK4cIKakASiW5IgDMIfpiAM4TUAAWAFqB0VDT05PTVlyCE1OVzBBVUVOCiwIwaQBEgQxMjQxGKakASCAeSiY9IgDMMz1iAM4VUABWAFqAkVGcgVVTDJFRgosCMGkARIEMTc2OBiAeSDPlAEo4fiIAzDF-YgDOFVAAVgBagJFRnIFVUwyRUYKnwEKNAjBpAESBDE3NjkYz5QBIKQmKMaziQMwqrSJAzhUQABYAWoHRUNPTk9NWXIIVU5BNEEwRU4KMgjVggESAzgxOBikJiCIOCigvokDMILDiQM4VUABWAFqB0VDT05PTVlyCFVOQTRBMEVOCjMI1YIBEgQyMTk3GIg4IK4cKKzJiQMw18qJAzhVQAFYAWoHRUNPTk9NWXIIVU5BNEEwRU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ## Frequently asked questions ### How much does a flight from O'Hare Intl. Airport (ORD) to Libertador General Jose de San Martin Airport (PSS) cost? ### What is the cheapest month to fly from O'Hare Intl. Airport (ORD) to Libertador General Jose de San Martin Airport (PSS)? ### What is the cheapest airline that flies from O'Hare Intl. Airport (ORD) to Libertador General Jose de San Martin Airport (PSS)? ### How many flights per day from O'Hare Intl. Airport (ORD) to Libertador General Jose de San Martin Airport (PSS)? ### What day of the week has the most flights from ORD to PSS? ### What is the best time to fly from O'Hare Intl. Airport (ORD) to Libertador General Jose de San Martin Airport (PSS)? ### Is it cheaper to buy a plane ticket from O'Hare Intl. Airport (ORD) to Libertador General Jose de San Martin Airport (PSS) last-minute? ### Is it cheaper to book an ORD to PSS flight and hotel package? ### Can I cancel or change the date of my flight from O'Hare Intl. Airport (ORD) to Libertador General Jose de San Martin Airport (PSS)? ## Travel information | Origin airport | O'Hare Intl. | | ------------------- | ------------------------------------- | | Destination airport | Libertador General Jose de San Martin | | Roundtrip price | $3,405 | | Distance | 5207 mi | ## Book with confidence # Chicago to Posadas Flights The cheapest times to fly from Chicago 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 Chicago to Posadas are during the month of December. You can find some of the cheapest flights from Chicago to Posadas with Expedia's search tool and vast selection of airlines. The best time to book a flight from Chicago to Posadas Sunday is one of the best days to book for cheap flights from Chicago 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 Chicago 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 Chicago to Posadas in 2026\. You can also book with separate airlines for your outbound and return journeys, from $598 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 Chicago 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 Chicago 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. \*Flight schedules are subject to change. ## Explore a world of travel with Expedia - Lodging - Flights - Packages - Cars - Vacation Rentals - Other - [Posadas Hotels ](https://www.expedia.com/Posadas-Hotels.d2887.Travel-Guide-Hotels) - [Adults Only Resorts & in Posadas ](https://www.expedia.com/Posadas-Hotels-Adults-Only-Resorts.0-0-d2887-tAdultsOnlyResorts.Travel-Guide-Filter-Hotels) - [5 Star Hotels in Posadas ](https://www.expedia.com/5Star-Posadas-Hotels.s50-0-d2887.Travel-Guide-Filter-Hotels) - [Beach Hotels in Posadas ](https://www.expedia.com/Posadas-Hotels-Beach-Hotel.0-0-d2887-tBeachHotel.Travel-Guide-Filter-Hotels) - [Luxury Hotels in Posadas ](https://www.expedia.com/Posadas-Hotels-Luxury-Hotel.0-0-d2887-tLuxuryHotel.Travel-Guide-Filter-Hotels) - [Hotel Wedding Venues Hotels in Posadas ](https://www.expedia.com/Posadas-Hotels-Wedding-Hotels.0-0-d2887-tWeddingHotels.Travel-Guide-Filter-Hotels) - [Romantic Hotels in Posadas ](https://www.expedia.com/Posadas-Hotels-Romantic-Hotel.0-0-d2887-tRomanticHotel.Travel-Guide-Filter-Hotels) - 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