WAS - SLU

$403 Find Cheap Flights from Washington, D.C. to Castries - Compare and Save

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 9/20. 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
$902
Multiple Airlines
Tue 9/22Sun 9/27
IAD - SLU • 2 stops
Cheapest one-way
$403
Multiple Airlines
Sun 9/20
IAD - SLU • 2 stops
When to travel
Cheapest • 100% price drop
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

Tue, Sep 22 - Sun, Sep 27
Multiple Airlines Logo
9:55 am - 7:00 pm
IAD
-
SLU
33h 05m
2 stops
Multiple Airlines Logo
12:35 pm - 3:25 pm
SLU
-
IAD
26h 50m
2 stops
$902Multiple Airlines
Tue, Sep 1 - Mon, Sep 7
Multiple Airlines Logo
8:40 pm - 7:00 pm
DCA
-
SLU
22h 20m
2 stops
Multiple Airlines Logo
12:35 pm - 10:34 pm
SLU
-
DCA
33h 59m
2 stops
$902Multiple Airlines
Wed, Oct 14 - Sat, Oct 17
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
3:45 pm - 10:34 pm
SLU
-
DCA
54h 49m
2 stops
$917Multiple Airlines
Sat, Aug 29 - Thu, Sep 3
Multiple Airlines Logo
4:20 pm - 7:00 pm
IAD
-
SLU
26h 40m
2 stops
Multiple Airlines Logo
3:45 pm - 3:24 pm
SLU
-
IAD
47h 39m
2 stops
$947Multiple Airlines
Sat, Aug 29 - Thu, Sep 3
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
3:45 pm - 6:12 pm
SLU
-
DCA
50h 27m
2 stops
$947Multiple Airlines
Sat, Sep 12 - Fri, Sep 18
Multiple Airlines Logo
4:00 pm - 7:00 pm
IAD
-
SLU
27h 00m
2 stops
Multiple Airlines Logo
12:35 pm - 11:21 am
SLU
-
IAD
22h 46m
2 stops
$972Multiple Airlines
Wed, Jul 8 - Sat, Jul 11
Multiple Airlines Logo
6:59 am - 3:15 pm
DCA
-
SLU
32h 16m
2 stops
Multiple Airlines Logo
12:35 pm - 8:52 am
SLU
-
DCA
20h 17m
2 stops
$977Multiple Airlines
Wed, Oct 14 - Sat, Oct 17
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
$1,034Multiple Airlines
Fri, Oct 9 - Tue, Oct 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
$1,064Multiple Airlines
Sat, Aug 29 - Thu, Sep 3
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
12:45 pm - 9:31 pm
SLU
-
DCA
32h 46m
3 stops
$1,095Multiple 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.

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 July, where the average cost of round-trip tickets is $1,235 and $1,007 respectively.

Good to know

Low seasonDecember
Best time to beat the crowds with an average 73% drop in price.
Most popular time to fly and prices are also 41% lower on average.

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 5 days, the lowest price for a flight from Washington, D.C. to Castries was $403 for a one-way ticket and $902 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.

  • Which is the best airline for flights from Washington, D.C. to Castries, American Airlines or JetBlue?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Castries are American Airlines and JetBlue. With an average price for the route of $1,007 and an overall rating of 7.1, American Airlines is the most popular choice. JetBlue is also a great choice for the route, with an average price of $565 and an overall rating of 7.1.

  • 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 airlines 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 11779 reviews
7.5Boarding
7.2Comfort
6.4Food
7.9Crew
6.8Entertainment
Airline reviews

The seats were extremely cramped, with very little legroom or personal space. There was no room left in the overhead bins for a backpack, and the space under the seat in front was so limited that I could barely fit my bag underneath. Overall, the seating arrangement felt very uncomfortable and overcrowded.

2.0 MediocreKrishna, Jun 2026
DCA - ORD
Read more American Airlines reviews

The seats were extremely cramped, with very little legroom or personal space. There was no room left in the overhead bins for a backpack, and the space under the seat in front was so limited that I could barely fit my bag underneath. Overall, the seating arrangement felt very uncomfortable and overcrowded.

As always, most AA flights that we fly are almost ALWAYS delayed and that too multiple times. Very frustrating

The small flights with Valet Luggage has a poor service

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.

A nightmare. Scheduled flight delayed 2 hours then cancelled because pilot timed out . Unable to find another pilot. Really?! Weather certainly a factor, but JetBlue seemed totally unprepared for the chaos that ensued when flight routes were cancelled. More cancelled flights, finally many of us who had been bumped from other flights were allowed to board a Boston bound plane around 3:00am, delay after delay, sat on tarmac for another half hour while pilot dealt with weight distribution issues (?), arrived in Boston 4:30. Crew were wonderful- same attendants all day and night and they were exhausted. Fortunately for me and my son that Boston was our final destination, not so lucky for many who missed connecting flights.

The flight was delayed 14 hours and communication was very poor. No one seemed to know what was happening and the gate agent was trying to help people for several flights. She was by herself trying to help 100s of people.

JetBlue worker, Blythe, was so amazing at the DCA counter. If it wasn’t for her, I’m not sure we would’ve made it through. Please thank her!

On time, friendly attendants, quick wheelchair assistance and help checking in bags. Also appreciated change in seats, more forward to make it easier for my 97 year old mother to board and exit the plane. Thank you, JetBlue!

Flight was on time and smooth. Customer service was decent

They forced me to check my hand luggage at the gate.

Still hasn’t left. Why are you asking how it was?

My flight got delayed and eventually canceled, then rescheduled. I and several others had a connection from Boston to Paris and asked several times if we would make it. They assured us we would and then rebooked us mid flight without our consent and closed doors early even though they said they communicated we were a bit delayed. We got stranded in Boston and I opted with being rebooked for a different connection to France since they refused to pay for a Hotel. I've now been in Europe for 5 days and still haven't recieved my bags. There was absolutely no urgency for the fact that I'm in a foreign country with absolutely no change of clothes or any of my medication. Such an overwhelming and frustrating experience.

One hour delayed departure resulted in problems with planned ground transportation at my destination.

Plane is old and seats are worn. Add to it the plane was dirty. No plugs for laptop.

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

Information on your arrival and departure airports