$422 Cheap Flights from Castries (SLU) to Washington (IAD)

View $422 flight on Sun, May 31, 2026Opens in a new window

Popular airlines from George F. L. Charles Airport (SLU) to Washington Dulles Intl. Airport (IAD)

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Cheap Flights from Castries to Washington (SLU-IAD)

Prices were available within the past 7 days and start at $422 for one-way flights and $3,084 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Caribbean Airlines
Fri, May 15 - Sat, Jun 13
SLU
Castries
IAD
Washington
$3,084 Roundtrip, found 17 hours ago
$3,084
Roundtrip
found 17 hours ago
Select Caribbean Airlines flight, departing Fri, May 15 from Castries to Washington, returning Sat, Jun 13, priced at $3,084 found 17 hours ago

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 $446
DCA
Ronald Reagan Washington National
CheapestClosest
Average driving time to city center8 min
Flights from $446

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 $422 and cheap return flights from $3,084 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 May 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 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™, 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 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 or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
George F. L. Charles
Destination airport
Washington Dulles Intl.
Roundtrip price
$3,084
Distance
1993 mi

*Flight schedules are subject to change.

*Available to One Key members.

 

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