--- title: "Castries to Washington cheap flights from $382 (SLU to IAD) - Expedia" description: "Cheap Flights from Castries (SLU) to Washington (IAD) start at $382 for one-way and $662 for round trip. Earn your airline miles on top of our rewards!" canonical: "https://www.expedia.com/lp/flights/slu/iad/castries-to-washington" language: en-US market: US currency: USD prices_as_of: 2026-11-14T08:45:44Z --- # $382 Cheap Flights from Castries (SLU) to Washington (IAD) ![A modern airport control tower with a spherical top and a curved, white-roofed building in the foreground.](https://images.trvl-media.com/place/4473161/a816c84d-81e5-4917-97c3-fb76eec1ff91.jpg?impolicy=fcrop&w=1200&h=500&q=medium) [View $382 flight on Sun, Dec 6, 2026](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:12/6/2026TANYT&trip=oneway&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:381.39&airProductToken=AQpoCjIIwYYBEgQxODc5GLQtIJjOASjPjJ8DMK2PnwM4R0AAWAFqBUJBU0lDcghHTFlFVDJCQQoyCMGGARIEODYyMBiYzgEgiBgo7JifAzDGmZ8DOEdAAVgBagVCQVNJQ3IIR0xZRVQyQkESCggCEAEYAioCQUMYASIECAEQASgCKAMoBDAN) Photo by Metropolitan Washington Airports Authority ## Popular airlines from George F. L. Charles Airport (SLU) to Washington Dulles Intl. Airport (IAD) [American Airlines](https://www.expedia.com/Flights-Search?leg1=from:SLU,to:IAD,departure:11/28/2026TANYT&leg2=from:IAD,to:SLU,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:SLU,to:IAD,departure:11/28/2026TANYT&leg2=from:IAD,to:SLU,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:SLU,to:IAD,departure:11/28/2026TANYT&leg2=from:IAD,to:SLU,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:SLU,to:IAD,departure:11/28/2026TANYT&leg2=from:IAD,to:SLU,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:SLU,to:IAD,departure:11/28/2026TANYT&leg2=from:IAD,to:SLU,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:SLU,to:IAD,departure:11/28/2026TANYT&leg2=from:IAD,to:SLU,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:SLU,to:IAD,departure:11/28/2026TANYT&leg2=from:IAD,to:SLU,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 Castries to Washington (SLU-IAD) Prices were available within the past 7 days and start at $382 for one-way flights and $662 for roundtrip, for the period specified. Prices and availability are subject to change. All deals One way Roundtrip [Select Air Canada flight, departing Sun, Nov 15 from Vieux Fort to Washington, returning Thu, Nov 26, priced at $662 Found 3 days ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:11/15/2026TANYT&leg2=from:IAD,to:UVF,departure:11/26/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:661.59&airProductToken=AQpoCjIIwYYBEgQxODc5GLQtIJjOASivoJ0DMI2jnQM4R0AAWAFqBUJBU0lDcghHS1lFVDJCQQoyCMGGARIEODYyMBiYzgEgiBgozKydAzCmrZ0DOEdAAVgBagVCQVNJQ3IIR0tZRVQyQkEKaAoyCMGGARIEODYxORiIGCCYzgEoipyeAzDhnJ4DOEdAAFgBagVCQVNJQ3IIR0xZRVQyQkEKMgjBhgESBDE4NzgYmM4BILQtKL2kngMw-KaeAzhHQAFYAWoFQkFTSUNyCEdMWUVUMkJBEgoIAhABGAIqAkFDGAEiBAgBEAEoAigDKAQwDQ) Sun, Nov 15 - Thu, Nov 26 · UVF · IAD · Roundtrip [Select Air Canada flight, departing Sun, Nov 15 from Vieux Fort to Washington, returning Thu, Nov 26, priced at $673 Found 3 days ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:11/15/2026TANYT&leg2=from:IAD,to:UVF,departure:11/26/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:672.39&airProductToken=AQpoCjIIwYYBEgQxODc5GLQtIJjOASivoJ0DMI2jnQM4R0AAWAFqBUJBU0lDcghHS1lFVDJCQQoyCMGGARIEODYyMBiYzgEgiBgozKydAzCmrZ0DOEdAAVgBagVCQVNJQ3IIR0tZRVQyQkEKdAo-CMGGARIEMzg1NxiIGCCYzgEo3p6eAzDEn54DOEdAAFgBagVCQVNJQ3IIR0xZRVQyQkF6CgjVggESBDM1MTUKMgjBhgESBDE4NzgYmM4BILQtKL2kngMw-KaeAzhHQAFYAWoFQkFTSUNyCEdMWUVUMkJBEgoIARABGAEqAkFDGAEiBAgBEAEoAigDKAQwDQ) Sun, Nov 15 - Thu, Nov 26 · UVF · IAD · Roundtrip [Select Air Canada flight, departing Mon, Nov 16 from Vieux Fort to Washington, returning Sat, Nov 28, priced at $679 Found 2 days ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:11/16/2026TANYT&leg2=from:IAD,to:UVF,departure:11/28/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:678.78&airProductToken=AQpoCjIIwYYBEgQxODc5GLQtIJjOASjPq50DMK2unQM4R0AAWAFqBUJBU0lDcghHS1lFVDJCQQoyCMGGARIEODYyMBiYzgEgiBgo7LedAzDGuJ0DOEdAAVgBagVCQVNJQ3IIR0tZRVQyQkEKaAoyCMGGARIEODYxNRiIGCCYzgEov6-eAzCWsJ4DOEdAAFgBagVCQVNJQ3IIR0xZRVQyQkEKMgjBhgESBDE4NzgYmM4BILQtKP26ngMwuL2eAzhHQAFYAWoFQkFTSUNyCEdMWUVUMkJBEgoIAhABGAIqAkFDGAEiBAgBEAEoAigDKAQwDQ) Mon, Nov 16 - Sat, Nov 28 · UVF · IAD · Roundtrip [Select Air Canada flight, departing Fri, Nov 20 from Vieux Fort to Washington, returning Wed, Dec 2, priced at $689 Found 7 hours ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:11/20/2026TANYT&leg2=from:IAD,to:UVF,departure:12/2/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:688.28&airProductToken=AQpoCjIIwYYBEgQxODc5GLQtIJjOASjP2J0DMK3bnQM4S0AAWAFqBUJBU0lDcghLTFlFVDJCQQoyCMGGARIEODYxOBiYzgEgiBgo4-KdAzC9450DOEtAAVgBagVCQVNJQ3IIS0xZRVQyQkEKaAoyCMGGARIEODYxNRiIGCCYzgEov9yeAzCW3Z4DOEtAAFgBagVCQVNJQ3IIS0xZRVQyQkEKMgjBhgESBDE4NzgYmM4BILQtKP3nngMwuOqeAzhLQAFYAWoFQkFTSUNyCEtMWUVUMkJBEgoIAhABGAIqAkFDGAEiBAgBEAEoAigDKAQwDQ) Fri, Nov 20 - Wed, Dec 2 · UVF · IAD · Roundtrip [Select Air Canada flight, departing Mon, Nov 16 from Vieux Fort to Washington, returning Sat, Nov 28, priced at $690 Found 2 days ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:11/16/2026TANYT&leg2=from:IAD,to:UVF,departure:11/28/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:689.59&airProductToken=AQpoCjIIwYYBEgQxODc5GLQtIJjOASjPq50DMK2unQM4R0AAWAFqBUJBU0lDcghHS1lFVDJCQQoyCMGGARIEODYyMBiYzgEgiBgo7LedAzDGuJ0DOEdAAVgBagVCQVNJQ3IIR0tZRVQyQkEKdAo-CMGGARIEMzg1NxiIGCCYzgEonrWeAzCEtp4DOEdAAFgBagVCQVNJQ3IIR0xZRVQyQkF6CgjVggESBDM1MTUKMgjBhgESBDE4NzgYmM4BILQtKP26ngMwuL2eAzhHQAFYAWoFQkFTSUNyCEdMWUVUMkJBEgoIARABGAEqAkFDGAEiBAgBEAEoAigDKAQwDQ) Mon, Nov 16 - Sat, Nov 28 · UVF · IAD · Roundtrip [Select Air Canada flight, departing Fri, Nov 20 from Vieux Fort to Washington, returning Thu, Dec 3, priced at $692 Found 2 days ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:11/20/2026TANYT&leg2=from:IAD,to:UVF,departure:12/3/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:691.78&airProductToken=AQp0CjIIwYYBEgQxODc5GLQtIJjOASjP2J0DMK3bnQM4R0AAWAFqBUJBU0lDcghHTFlFVDJCQQo-CMGGARIEMzkzNxiYzgEgiBgo5OCdAzDN4Z0DOEdAAVgBagVCQVNJQ3IIR0xZRVQyQkF6CgjVggESBDM2MjkKpgEKPQjBhgESBDQ5NDIYiBggmF0oq-meAzCg6p4DOEdAAFgBagVCQVNJQ3IIR0xZRVQyQkF6CgjVggESBDM1MzkKMQjBhgESAzQyORiYXSCYzgEojO2eAzDs7Z4DOEdAAVgBagVCQVNJQ3IIR0xZRVQyQkEKMgjBhgESBDE4NzgYmM4BILQtKJ3zngMw2PWeAzhHQAFYAWoFQkFTSUNyCEdMWUVUMkJBEgoIARABGAEqAkFDGAEiBAgBEAEoAigDKAQwDQ) Fri, Nov 20 - Thu, Dec 3 · UVF · IAD · Roundtrip [Select Air Canada flight, departing Mon, Nov 16 from Vieux Fort to Washington, returning Sun, Nov 29, priced at $693 Found 2 days ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:11/16/2026TANYT&leg2=from:IAD,to:UVF,departure:11/29/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:692.89&airProductToken=AQpoCjIIwYYBEgQxODc5GLQtIJjOASjPq50DMK2unQM4R0AAWAFqBUJBU0lDcghHS1lFVDJCQQoyCMGGARIEODYyMBiYzgEgiBgo7LedAzDGuJ0DOEdAAVgBagVCQVNJQ3IIR0tZRVQyQkEKmgEKMQjBhgESBDg3MjQYiBggmF0o37qeAzDGu54DOEdAAFgBagVCQVNJQ3IIR0xZRVQyQkEKMQjBhgESAzQyORiYXSCYzgEotMCeAzCUwZ4DOEdAAVgBagVCQVNJQ3IIR0xZRVQyQkEKMgjBhgESBDE4NzgYmM4BILQtKJ3GngMw2MieAzhHQAFYAWoFQkFTSUNyCEdMWUVUMkJBEgoIAhABGAIqAkFDGAEiBAgBEAEoAigDKAQwDQ) Mon, Nov 16 - Sun, Nov 29 · UVF · IAD · Roundtrip [Select American Airlines flight, departing Tue, Dec 29 from Vieux Fort to Washington, returning Mon, Jan 4, priced at $711 Found 4 days ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:12/29/2026TANYT&leg2=from:IAD,to:UVF,departure:1/4/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:710.79&airProductToken=AQplCjEIwYIBEgQyODYwGLQtIIwCKNaNoQMwyI-hAzhCQABYAWoFQkFTSUNyCE9OVTVBSEJaCjAIwYIBEgM1NTEYjAIgiBgompGhAzDFkqEDOEJAAVgBagVCQVNJQ3IIT05VNUFIQloKZQowCMGCARIDNTUyGIgYIIwCKPXNoQMwns-hAzhCQABYAWoFQkFTSUNyCE9OVTVBSEJaCjEIwYIBEgQyOTU5GIwCILQtKPPPoQMwx9GhAzhCQAFYAWoFQkFTSUNyCE9OVTVBSEJaEgwIARABGAEqAkFBMgAYASIECAEQASgCKAMoBDAL) Tue, Dec 29 - Mon, Jan 4 · UVF · IAD · Roundtrip [Select Delta flight, departing Fri, Dec 4 from Vieux Fort to Washington, returning Tue, Dec 8, priced at $717 Found 2 days ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:12/4/2026TANYT&leg2=from:IAD,to:UVF,departure:12/8/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:716.79&airProductToken=AQpuCjUIxJgBEgQxNzg1GLQtIOBcKMr1ngMwhPieAzhFQABYAWoJTUFJTkJBU0lDcghUTk5MME5CWgo1CMSYARIEMjU0ORjgXCCIGCiQ-Z4DMPX5ngM4RUABWAFqCU1BSU5CQVNJQ3IIVE5OTDBOQloSCggBEAEYASoCREwYASIECAEQASgCKAMoBDAB) Fri, Dec 4 - Tue, Dec 8 · UVF · IAD · Roundtrip [Select United flight, departing Sat, Dec 26 from Vieux Fort to Washington, returning Thu, Dec 31, priced at $742 Found 2 days ago](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:12/26/2026TANYT&leg2=from:IAD,to:UVF,departure:12/31/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:741.89&airProductToken=AQpuCjUI1YIBEgM1NDEYtC0grhwo8OugAzDv7qADOE5AAFgBagoxX2Jhc2ljZWNvcghTTkE4RTlCTgo1CNWCARIDMjQ3GK4cIIgYKLfwoAMwsvGgAzhOQABYAWoKMV9iYXNpY2Vjb3IIU05BOEU5Qk4KcQo3CNWCARIEMTM1ORiIGCDEjQEo-aChAzDEoaEDOE5AAFgBagoxX2Jhc2ljZWNvcghUTlg2QTlCTgo2CNWCARIDNDQ5GMSNASC0LSiSoqEDMKekoQM4TkAAWAFqCjFfYmFzaWNlY29yCFROWDZBOUJOEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwCw) Sat, Dec 26 - Thu, Dec 31 · UVF · IAD · Roundtrip ## Alternative airports near Washington Prices were available within the past 7 days. Prices and availability are subject to change. [Select flight to Ronald Reagan Washington National DCA. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $1,415](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:DCA,departure:11/28/2026TANYT&leg2=from:DCA,to:UVF,departure:12/2/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) 8 min ## Book with confidence ### Castries to Washington Flights #### The cheapest times to fly from Castries to Washington 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 Castries to Washington are during the month of November. You can find some of the cheapest flights from Castries to Washington with Expedia's search tool and vast selection of airlines. #### The best time to book a flight from Castries to Washington Sunday is one of the best days to book for cheap flights from Castries to Washington: 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 Castries to Washington 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 Castries to Washington in 2026\. You can also book with separate airlines for your outbound and return journeys, from $382 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 Castries to Washington 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 Castries to Washington 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.) cost? You can find cheap one-way flights from $382 and cheap return flights $662 SLU to IAD 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 SLU to IAD ticket fares go up or down. ### What is the cheapest month to fly from Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.)? The cheapest month to fly from SLU to IAD is November 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.)? Enter SLU to IAD and your travel dates, then apply the 'Nonstop' filter to see only direct flights. ### What is the cheapest airline that flies from Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.)? Caribbean Airlines and Windward Island Airways International are just some of the carriers that fly from Castries (SLU) to Washington, DC (IAD). 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.)? To find a cheap flight from Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.), 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.)? 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.)? Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from SLU to IAD. To compare more early flights, use the "Early Morning" and "Morning" filters in your search. ### How long does it take to fly from Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.)? Flights from SLU to IAD with one stop typically take around 8 hours 20 minutes, covering approximately 1,993 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.)? Select the "Business class" and "First class" filters when looking for SLU to IAD 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.) flight with Expedia? It's easy to earn miles on a Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.) 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.) at the last minute? Typically, booking a last minute flight from Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.) 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.) flight and hotel package? Securing a Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.) [Fairfax County Vacation Packages](https://www.expedia.com/chantilly.d8638.destination-travel-guides) 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 Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.)? If you booked your Castries (SLU-George F. L. Charles) to Washington, DC (IAD-Washington Dulles Intl.) 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 | George F. L. Charles Airport | | ------------------- | ------------------------------- | | Destination airport | Washington Dulles Intl. Airport | | Distance | 1,993 miles away | | Roundtrip price | $662 | ## Explore a world of travel with Expedia - [Flights](?equalTargetTab=tab-0) - [Flights from West Palm Beach (PBI) to Washington (DCA)](https://www.expedia.com/lp/flights/pbi/dca/west-palm-beach-to-washington) - [Flights from Barcelona (BCN) to Washington (IAD)](https://www.expedia.com/lp/flights/bcn/iad/barcelona-to-washington) - [Flights from Ho Chi Minh City (SGN) to Washington (IAD)](https://www.expedia.com/lp/flights/sgn/iad/ho-chi-minh-city-to-washington) - [Flights from Karachi (KHI) to Washington (IAD)](https://www.expedia.com/lp/flights/khi/iad/karachi-to-washington) - [Flights from Addis Ababa (ADD) to Washington (IAD)](https://www.expedia.com/lp/flights/add/iad/addis-ababa-to-washington) - [Flights from Cairo (CAI) to Washington (IAD)](https://www.expedia.com/lp/flights/cai/iad/cairo-to-washington) - [Flights from Pittsburgh (PIT) to Washington (IAD)](https://www.expedia.com/lp/flights/pit/iad/pittsburgh-to-washington) - [Flights from St. Louis (STL) to Washington (DCA)](https://www.expedia.com/lp/flights/stl/dca/st-louis-to-washington) - [Flights from Lahore (LHE) to Washington (IAD)](https://www.expedia.com/lp/flights/lhe/iad/lahore-to-washington) - [Flights from Newark Liberty Intl. 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