$423 Cheap Flights from Washington (DCA) to Castries (SLU)

View $423 flight on Wed, Dec 10, 2025Opens in a new window

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

Cheap Flights from Washington to Castries (DCA-SLU)

Prices were available within the past 7 days and start at $423 for one-way flights and $1,190 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

JetBlue Airways
Wed, May 20 - Mon, May 25
DCA
Washington
SLU
Castries
$1,190 Roundtrip, found 3 days ago
$1,190
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Wed, May 20 from Washington to Castries, returning Mon, May 25, priced at $1,190 found 3 days ago

Find the cheapest month to fly from Washington (DCA) to Castries (SLU)

September is typically the cheapest month to fly

From $397 - $680 per traveler.

Alternative airports near Castries

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Hewanorra Intl. UVF. Cheapest option available. Average driving time to city center is 53 minutes. Flights from $561
UVF
Hewanorra Intl.
Cheapest
Average driving time to city center53 min
Flights from $561

Frequently asked questions

How much does a flight from Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU) cost?
Get a cheap one-way flight from $423 or cheap return flight from $1,190 from Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU)?
Traveling in May is a great way to save, as it's the cheapest month for flights between DCA and SLU. You'll often find the lowest prices during off-peak months.
What is the cheapest airline that flies from Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll fly you from DCA to SLU. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU)?
Direct flights from Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel details and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from DCA to SLU?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU)?
To avoid possible delays on the Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU) route, fly before 3 PM. Later departures are 22% more likely to be canceled.**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 Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU) last-minute?
Waiting until just before your trip to book a ticket from DCA to SLU generally means paying more. While you may come across some last-minute deals, they're not always guaranteed. Allow some flexibility in your schedule to boost your chances of snagging a bargain.
Is it cheaper to book a DCA to SLU flight and hotel package?
Booking a DCA to SLU flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Choose from our extensive range of hotels and then add activities, flights 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 Ronald Reagan Washington National Airport (DCA) to George F. L. Charles Airport (SLU)?
In most cases, you can cancel or reschedule your DCA to SLU flight. However, there may be additional fees, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline's policies and fees on flight changes, or if you need more details, go to our Customer Service portal.

Travel information

Origin airport
Ronald Reagan Washington National
Destination airport
George F. L. Charles
Roundtrip price
$1,189
Distance
1974 mi

Book with confidence

Washington to Castries Flights

The cheapest times to fly from Washington to Castries

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 Castries are during the month of May. You can find some of the cheapest flights from Washington to Castries with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Castries

Sunday is one of the best days to book for cheap flights from Washington to Castries: 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 Castries

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 Castries in 2025. You can also book with separate airlines for your outbound and return journeys, from $423 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 Castries 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 Washington to Castries 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.

 

Washington to Castries Flights

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*Available to One Key members.