WAS - SLU

$435 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 11/25. 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
$915
Multiple Airlines
Tue 8/25Wed 9/2
IAD - SLU • 2 stops
Cheapest one-way
$672
Multiple Airlines
Wed 11/25
BWI - 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, Aug 25 - Wed, Sep 2
Multiple Airlines Logo
4:20 pm - 7:00 pm
IAD
-
SLU
26h 40m
2 stops
Multiple Airlines Logo
12:35 pm - 3:24 pm
SLU
-
IAD
26h 49m
2 stops
$915Multiple Airlines
Tue, Aug 25 - Wed, Sep 2
Multiple Airlines Logo
6:55 pm - 7:00 pm
DCA
-
SLU
24h 05m
2 stops
Multiple Airlines Logo
12:35 pm - 7:57 pm
SLU
-
DCA
31h 22m
2 stops
$915Multiple 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
$930Multiple Airlines
Mon, Aug 24 - Sun, Aug 30
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
12:35 pm - 10:31 pm
SLU
-
DCA
33h 56m
2 stops
$930Multiple Airlines
Wed, Aug 26 - Mon, Aug 31
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
12:35 pm - 8:52 am
SLU
-
DCA
20h 17m
2 stops
$932Multiple Airlines
Sat, Nov 21 - Sat, Nov 28
Multiple Airlines Logo
9:55 am - 7:00 pm
IAD
-
SLU
32h 05m
2 stops
Multiple Airlines Logo
12:35 pm - 8:23 pm
SLU
-
IAD
32h 48m
2 stops
$953Multiple Airlines
Mon, Jul 6 - Mon, Jul 13
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
12:35 pm - 10:31 pm
SLU
-
DCA
33h 56m
2 stops
$962Multiple Airlines
Fri, Jul 10 - Mon, Jul 13
Multiple Airlines Logo
5:15 pm - 7:00 pm
IAD
-
SLU
25h 45m
2 stops
Multiple Airlines Logo
12:35 pm - 3:24 pm
SLU
-
IAD
26h 49m
2 stops
$965Multiple Airlines
Fri, Jul 3 - Mon, Jul 6
Multiple Airlines Logo
5:15 pm - 7:00 pm
IAD
-
SLU
25h 45m
2 stops
Multiple Airlines Logo
12:35 pm - 4:32 pm
SLU
-
IAD
27h 57m
2 stops
$982Multiple Airlines
Sat, Jun 13 - Sat, Jun 20
Multiple Airlines Logo
6:59 am - 7:00 pm
DCA
-
SLU
12h 01m
2 stops
Multiple Airlines Logo
12:35 pm - 6:12 pm
SLU
-
DCA
29h 37m
2 stops
$1,082Multiple 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 August.

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
Cheapest flight$672
Best time to beat the crowds with an average 48% drop in price.
Most popular time to fly and prices are also 33% 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 5 days, the lowest price for a flight from Washington, D.C. to Castries was $435 for a one-way ticket and $915 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 $906 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 11643 reviews
7.2Comfort
6.9Entertainment
7.5Boarding
7.9Crew
6.4Food
Airline reviews

The small flights with Valet Luggage has a poor service

2.0 MediocreNaqhiuddin, May 2026
IAD - CLT
Read more American Airlines reviews

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.

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.

The flight was delayed for more than 3 hours the flight attendant was so angry, it was my first flight with JetBlue but i don’t think I flight with them again.

First the flt was delayed over 2 hrs bc of plane mechanics that should have been handled better! No text or email was sent so only found out at the airport so there we sat for 5 hours! THATS RIDICULOUS! The gate area was filthy! No agents showed up till hr before so no additional info was given-waited online for 15 mins while the gate agent chatted and got together then given last seat in back of plane!! No priority for senior or anything-took attendants over 2hrs to serve drinks and snack-WHY are they not served together? By time snack came needed another drink! Worst service in my life!

Since we started at syr the service, crews, and flights were just excellent

All the TV screens in my rows was non functional . The map shown for an international route was antiqued..

It was fine for what it was. It’s not luxury travel but it was efficient, for the most part. Having my carry-on transferred into luggage however, was unwelcome.

We had better-than-average leg room and I loved the access to shows and movies. During boarding, we could not hear the agent even though we were close to the boarding door, which was kind of scary when we realized that half of the passengers had already boarded. Also, the entertainment was awesome, but I could not hear the movie as well as I would have liked, because my headphones were crappy. It would have been better if I could connect my own ear buds via Bluetooth or if JetBlue provided headphones.

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 did not have onboard charging and TV screen flickering.

I was seated next to an autistic child who was out of control and had a child behind me kicking my seat for most of the trip. I will never fly JetBlue again. Ever. I don't care how cheap it is. It's terrible.

Boarding process was terrible. No assigned seat until the gate, then a long line to get seat assignment.

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

Information on your arrival and departure airports