Title: $633 Cheap flights from Castries to Washington (SLU to DCA) - Expedia.com ![Washington DC in Spring](https://images.trvl-media.com/place/3763/58eb1a51-e7f1-4f17-88af-21174d495e42.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/3763/58eb1a51-e7f1-4f17-88af-21174d495e42.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # $633 Cheap Flights from Castries (SLU) to Washington (DCA) [View $633 flight on Sat, Mar 7, 2026](https://expedia.com/Flights-Search?trip=oneway&leg1=from:SLU,to:DCA,departure:3/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:632.40&airProductToken=AQqcAQoxCNeaARIDODczGPKiASDyZSi9gIcDMJeBhwM4VEAAWAFqBVNBVkVScghUMTJTQVZFUgozCNWCARIEMTcwNxjyZSCuHCiwi4cDMJmOhwM4TEABWAFqB0VDT05PTVlyCExOQTRBOURTCjII1YIBEgQzNTYzGK4cIEMouY-HAzCvkIcDOExAAVgBagdFQ09OT01ZcghMTkE0QTlEUxIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAE) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travelers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA) - ![](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:SLU,to:DCA,departure:2/19/2026TANYT&leg2=from:DCA,to:SLU,departure:2/26/2026TANYT&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:SLU,to:DCA,departure:2/19/2026TANYT&leg2=from:DCA,to:SLU,departure:2/26/2026TANYT&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:SLU,to:DCA,departure:2/19/2026TANYT&leg2=from:DCA,to:SLU,departure:2/26/2026TANYT&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:SLU,to:DCA,departure:2/19/2026TANYT&leg2=from:DCA,to:SLU,departure:2/26/2026TANYT&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:SLU,to:DCA,departure:2/19/2026TANYT&leg2=from:DCA,to:SLU,departure:2/26/2026TANYT&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:SLU,to:DCA,departure:2/19/2026TANYT&leg2=from:DCA,to:SLU,departure:2/26/2026TANYT&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:SLU,to:DCA,departure:2/19/2026TANYT&leg2=from:DCA,to:SLU,departure:2/26/2026TANYT&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 Castries to Washington (SLU-DCA) Prices were available within the past 7 days and start at $633 for one-way flights and $1,755 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![Windward Island Airways International](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/WM.gif) Thu, Feb 19 - Mon, Feb 23 SLU Castries DCA Washington $1,755 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:SLU,to:DCA,departure:2/19/2026TANYT&leg2=from:DCA,to:SLU,departure:2/23/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1754.97&airProductToken=AQqcAQovCNeaARIDODcxGPKiASDyZSiQzIUDML_NhQM4VkAAWAFqBExJVEVyB1YxMkxJVEUKNAjVggESBDE4ODAY8mUgxI0BKIzYhQMwsdqFAzhVQAFYAWoHRUNPTk9NWXIIVU5BMEE5RU4KMwjVggESBDM0MjcYxI0BIEMok9uFAzDz24UDOFVAAVgBagdFQ09OT01ZcghVTkEwQTlFTgqeAQozCNWCARIEMzQxMxhDIMSNASiU9oUDMOj2hQM4TEAAWAFqB0VDT05PTVlyCExOQTRBOURTCjQI1YIBEgQxNjI5GMSNASDyZSiw94UDMK75hQM4TEABWAFqB0VDT05PTVlyCExOQTRBOURTCjEI15oBEgM4NzMY8mUg8qIBKJz6hQMwy_uFAzhUQAFYAWoFU0FWRVJyCFQxMlNBVkVSEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwAQ) ## Alternative airports near Washington Prices were available within the past 7 days. Prices and availability are subject to change. [](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:BWI,departure:2/19/2026TANYT&leg2=from:BWI,to:UVF,departure:2/26/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) BWI Baltimore Washington Intl. Thurgood Marshall 40 min [Flights from $639 ](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:BWI,departure:2/19/2026TANYT&leg2=from:BWI,to:UVF,departure:2/26/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) [](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:2/19/2026TANYT&leg2=from:IAD,to:UVF,departure:2/26/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) IAD Washington Dulles Intl. Cheapest 36 min [Flights from $571 ](https://www.expedia.com/Flights-Search?leg1=from:UVF,to:IAD,departure:2/19/2026TANYT&leg2=from:IAD,to:UVF,departure:2/26/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) __Flights from Castries (SLU) to Washington (DCA)__ | Origin airport | George F. L. Charles | | ------------------- | --------------------------------- | | Destination airport | Ronald Reagan Washington National | | Roundtrip price | $1,755 | | Distance | 1974 mi | ## 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 February. 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 $633 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 George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA) cost? ### What is the cheapest month to fly from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)? ### What is the cheapest airline that flies from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)? ### How many flights per day from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)? ### What day of the week has the most flights from SLU to DCA? ### What is the best time to fly from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)? ### Is it cheaper to buy a plane ticket from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA) last-minute? ### Is it cheaper to book a SLU to DCA flight and hotel package? ### Can I cancel or change the date of my flight from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)? \*Flight schedules are subject to change. \*Available to One Key members.