WAS - SLU

$775 Find Cheap Flights from Washington, D.C. to Castries

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Washington, D.C. to Castries departing on 8/31. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Castries

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Castries, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Castries, as well as popular online travel agencies
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Cheap Flights from Washington, D.C. to Castries (WAS-SLU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington, D.C. to Castries that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Washington, D.C. to Castries

Sun, Aug 31 - Sun, Sep 7
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6:37 am - 3:50 pmBWI-SLU
33h 13m2 stops
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12:30 pm - 11:37 pmSLU-BWI
35h 07m2 stops
$775
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Sun, Aug 31 - Sun, Sep 7
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6:37 am - 3:50 pmBWI-SLU
33h 13m2 stops
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12:30 pm - 11:16 pmSLU-BWI
34h 46m3 stops
$812
Find Deal
Sat, Nov 1 - Sat, Nov 8
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8:12 pm - 3:50 pmBWI-SLU
43h 38m3 stops
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6:20 pm - 12:15 amSLU-BWI
30h 55m3 stops
$820
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Sun, Aug 31 - Sun, Sep 7
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5:30 am - 3:50 pmBWI-SLU
34h 20m3 stops
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12:30 pm - 4:46 pmSLU-BWI
28h 16m3 stops
$854
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Sat, Nov 1 - Sat, Nov 8
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8:12 pm - 3:50 pmBWI-SLU
43h 38m3 stops
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1:15 pm - 11:54 pmSLU-BWI
11h 39m2 stops
$868
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Sun, Dec 14 - Thu, Dec 18
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11:05 am - 7:00 pmDCA-SLU
30h 55m2 stops
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9:10 am - 8:55 amSLU-DCA
24h 45m2 stops
$956
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Sat, Sep 6 - Sat, Sep 13
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10:20 am - 11:45 amIAD-SLU
25h 25m3 stops
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9:10 am - 9:38 amSLU-IAD
24h 28m2 stops
$976
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Sat, Sep 6 - Sat, Sep 13
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11:00 am - 11:45 amDCA-SLU
24h 45m3 stops
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9:10 am - 8:59 amSLU-DCA
23h 49m2 stops
$976
Find Deal
Sat, Sep 6 - Sat, Sep 13
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2:25 pm - 7:00 pmIAD-SLU
28h 35m2 stops
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9:10 am - 9:38 amSLU-IAD
24h 28m2 stops
$1,009
Find Deal
Sat, Sep 6 - Sat, Sep 13
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11:00 am - 7:00 pmDCA-SLU
32h 00m2 stops
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12:35 pm - 8:59 amSLU-DCA
20h 24m2 stops
$1,009
Find Deal
Booking Insights

KAYAK's insights & trends for Washington, D.C. to Castries flights

Get data-powered insights and trends into flights from Washington, D.C. to Castries to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Washington, D.C. to Castries?

What is the cheapest month to fly from Washington, D.C. to Castries?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. to Castries, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. to Castries is January, where tickets cost $655 (return) on average. On the other hand, the most expensive months are November and July, where the average cost of round-trip tickets is $958 and $867 respectively.

Find deals

Good to know

Low seasonJune
Cheapest flight$775
Best time to beat the crowds with an average 3% drop in price.
Most popular time to fly and prices are also 14% lower on average.
Flight from Baltimore to Castries

When to book flights from Washington, D.C. to Castries

Are your dates flexible? Find out the best times to travel from Washington, D.C. to Castries based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Washington, D.C. to Castries

  • What is the cheapest flight from Washington, D.C. to Castries?

    In the last 3 days, the lowest price for a flight from Washington, D.C. to Castries was $775 for a round-trip ticket.

  • Do I need a passport to fly between Washington, D.C. and Castries?

    Yes

  • Which aircraft models fly most regularly from Washington, D.C. to Castries?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Washington, D.C. to Castries?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington, D.C. to Castries.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington, D.C. to Castries?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Castries from Washington, D.C. is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington, D.C. to Castries?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Castries with an airline and back to Washington, D.C. with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington, D.C. to Castries?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Castries from Washington, D.C. up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Washington, D.C. to Castries

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Castries. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Washington, D.C. to Castries? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.2
American AirlinesOverall score based on 10000 reviews
7.5Boarding
7.2Comfort
6.9Entertainment
6.5Food
8.0Crew
Airline reviews

Dreadful experience. Our flight was delayed more than 8 hours due to a maintenance issue and the assistance from rebooking was poor. I was travelling with a bad knee and needed assistance waited in one place more than 3 hours before someone came with a wheelchair. The woman next to me was a 91 year old great grandmother who had waited more than 4 hours. There were moments of support from the staff but it appeared as they were going against the direction of management. It was apathy, lack of ownership and dismissive responses with small moments of kindness and understanding typically from grey haired, female, veteran staff..

6.0 Goodpaul, Aug 2025SEA - ORD
Read more American Airlines reviews

Dreadful experience. Our flight was delayed more than 8 hours due to a maintenance issue and the assistance from rebooking was poor. I was travelling with a bad knee and needed assistance waited in one place more than 3 hours before someone came with a wheelchair. The woman next to me was a 91 year old great grandmother who had waited more than 4 hours. There were moments of support from the staff but it appeared as they were going against the direction of management. It was apathy, lack of ownership and dismissive responses with small moments of kindness and understanding typically from grey haired, female, veteran staff..

We had to turn around and head back to Manchester. Problem with a plane engine.

Flight was delayed. Staff at the gate effectively and proactively communicated about the delay.

Very poor delay in dfw was really bad n long

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

Because of rescheduling, they had to put me on a flight that didn't go through Dallas

It was very difficult to stretch my knee out and I am very short. I also had a torn tendon in my knee which made it extra uncomfortable anyways. My husband is 6'2" and I can't imagine him flying in that plane.

3 hour weather delay followed by 1 hour (and counting) maintenance delay. UGH!

Couldn’t get the door on the plane to close leading to a nearly 2 hour delay. But, hey at least they didn’t cancel the flight.

They are still charging me after taking 466 and 833 for round trip from AR to to Bradley airport from 19 to 21. Then poor experience. Am hurt and I will say it on social media. Please stay away from this airline. I see in my bank account they are still taking 644. Am trying to stop it. I used to fly United airlines and I suggest that if you don't want extra charges and good service you go back there. American airlines delayed my flight again and I was late for my meeting, no recompensation but charging me over and over.

Everything you need to know for your flight from Washington, D.C. to Castries

Information on your arrival and departure airports

Castries (SLU)

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