$644 Cheap Flights from Castries (SLU) to Washington (DCA)

View $644 flight on Thu, Mar 5, 2026Opens in a new window

Popular airlines from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)

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Cheap Flights from Castries to Washington (SLU-DCA)

Prices were available within the past 7 days and start at $644 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

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Frequently asked questions

How much does a flight from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA) cost?
Snag a cheap one-way flight from $644 or cheap return flight from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)?
is the cheapest month to fly from SLU to DCA. Traveling outside of peak seasons is often the key to better flight prices.
What is the cheapest airline that flies from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest SLU to DCA flight.
How many flights per day from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)?
You'll have to catch a flight with a layover if you're traveling from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA). There are no daily direct flights on this route. However, simply filter your search to include one or more stops to discover an option that works for you.
What day of the week has the most flights from SLU to DCA?
Usually you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)?
Opt for a flight from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA) that leaves before 3 PM to reduce the risk of cancellations and delays. Later departures have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA) last-minute?
Booking your ticket from SLU to DCA right before your journey is typically more expensive. However, if there's some wiggle room with your schedule, you could snag a cheap last-minute fare.
Is it cheaper to book a SLU to DCA flight and hotel package?
Compared with arranging hotels and flights separately, booking a SLU to DCA flight and hotel package with Expedia could result in significant savings. Better yet, having everything in one place will take the hassle out of travel planning. Just secure your flights and choose from our extensive range of stays, then personalize your trip with other add-ons like activities and car rentals.
Can I cancel or change the date of my flight from George F. L. Charles Airport (SLU) to Ronald Reagan Washington National Airport (DCA)?
If you reserved your SLU to DCA flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal if you'd like more information.

Travel information

Origin airport
George F. L. Charles
Destination airport
Ronald Reagan Washington National
Distance
1974 mi

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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 . 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 $644 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. 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.

 

Castries to Washington Flights

*Flight schedules are subject to change.

*Available to One Key members.