WAS - SLU

$496 Find Cheap Flights from Washington, D.C. to Castries

This is the cheapest one-way 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 5/15. 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, 0 bags

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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Everything you should know

Cheapest round-trip
$926
Multiple Airlines
Fri 6/12Mon 6/15
DCA - SLU • 2 stops
Cheapest one-way
$465
Multiple Airlines
Fri 5/15
DCA - SLU • 2 stops
When to travel
September
Cheapest • 100% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Castries!
Flight Deals
Booking Insights
Flight Deals

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

Fri, Jun 12 - Mon, Jun 15
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
12:35 pm - 8:53 am
SLU
-
DCA
20h 18m
2 stops
$926Multiple Airlines
Tue, Jun 16 - Sat, Jun 20
Multiple Airlines Logo
8:40 pm - 7:00 pm
DCA
-
SLU
22h 20m
2 stops
Multiple Airlines Logo
12:35 pm - 8:52 am
SLU
-
DCA
20h 17m
2 stops
$930Multiple Airlines
Sat, Jun 13 - Thu, Jun 18
Multiple Airlines Logo
6:55 pm - 7:00 pm
DCA
-
SLU
24h 05m
2 stops
Multiple Airlines Logo
3:45 pm - 8:52 am
SLU
-
DCA
41h 07m
2 stops
$944Multiple Airlines
Sun, May 31 - Wed, Jun 3
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
12:35 pm - 10:28 pm
SLU
-
DCA
33h 53m
2 stops
$948Multiple Airlines
Fri, Jun 19 - Wed, Jun 24
Multiple Airlines Logo
6:55 pm - 7:00 pm
DCA
-
SLU
24h 05m
2 stops
Multiple Airlines Logo
12:35 pm - 10:31 pm
SLU
-
DCA
33h 56m
2 stops
$968Multiple Airlines
Sat, Jun 13 - Thu, Jun 18
Multiple Airlines Logo
5:15 pm - 7:00 pm
IAD
-
SLU
25h 45m
2 stops
Multiple Airlines Logo
3:45 pm - 4:12 pm
SLU
-
IAD
48h 27m
2 stops
$984Multiple Airlines
Fri, Jun 19 - Sat, Jun 27
Multiple Airlines Logo
6:55 pm - 7:00 pm
DCA
-
SLU
24h 05m
2 stops
Multiple Airlines Logo
12:35 pm - 8:52 am
SLU
-
DCA
20h 17m
2 stops
$1,001Multiple Airlines
Sat, Oct 3 - Mon, Oct 12
Multiple Airlines Logo
4:00 pm - 7:00 pm
IAD
-
SLU
27h 00m
2 stops
Multiple Airlines Logo
12:35 pm - 3:25 pm
SLU
-
IAD
26h 50m
2 stops
$1,002Multiple Airlines
Thu, Sep 10 - Sun, Sep 13
Multiple Airlines Logo
8:40 pm - 7:00 pm
DCA
-
SLU
22h 20m
2 stops
Multiple Airlines Logo
12:35 pm - 8:55 am
SLU
-
DCA
20h 20m
2 stops
$1,002Multiple Airlines
Wed, Sep 30 - Sun, Oct 4
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
12:35 pm - 8:55 am
SLU
-
DCA
20h 20m
2 stops
$1,003Multiple Airlines
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?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. to Castries departing in June.

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 September, where tickets cost $0 (return) on average. On the other hand, the most expensive months are August and November, where the average cost of round-trip tickets is $1,235 and $975 respectively.

Find deals

Good to know

Low seasonDecember
Best time to beat the crowds with an average 49% drop in price.
Most popular time to fly with an average 18% increase in price.

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 $465 for a one-way ticket and $926 for a round-trip.

  • 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.
7.1
American AirlinesOverall score based on 11666 reviews
7.2Comfort
6.4Food
7.5Boarding
6.9Entertainment
7.9Crew
Airline reviews

Overall a good experience, however Wifi was not working on the flight.

10.0 ExcellentNathan, Apr 2026
DCA - RDU
Read more American Airlines reviews

Overall a good experience, however Wifi was not working on the flight.

THe flight was an hour late. You got us on the plan and we sat on the ground for 45 minutes with no information from the pilot whatsoever. Worst flight this year.

Going non stop to lax like I paid for. Not stopping in MCI for gas. Too long of delays

Human interaction. Thought there would be more service-even a smile would have been nice.

Incoming flight was delayed, delaying boarding. It then took 30 mins to take off. Took 20 mins to get to a gate because they changed the gate last minute, crew weren’t ready so there was no one staffed to work the jet bridge. Boarding was so disorganized as is usual with American because everyone just stands around the gate regardless of boarding group.

Delays with no explanation. It could have been handled better.

Flight delay for mechanical. Inbound arrived on time. No one said why mechanical delay.

Flight boarded, departed and landed on time. Excellent service from flight attendant in FIRST

This was one of the most frustrating travel experiences I've had to date. I had changed my flight day of to this one as it was slated to depart on time. It ended up being so delayed that my original flight took off before this one did. The boarding process began but eventually stopped and everyone had to get off the plane as a problem was identified. The person at the front desk just tried to laugh it off as if this wasn't already a huge inconvenience. From there, we eventually got to board only to sit at the gate for an additional hour because of some additional issue. This was extremely frustrating and caused a lot of stress.

It was a little concerning to hear the ground crew arguing with the flight crew over baggage space. Instead of taking them and checking them, they started checking for space in the first class cabin moving items around like the flight crew didn't know what they were doing. I was embarrassed for them.

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

Information on your arrival and departure airports

Castries (SLU)