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Cheap flights from Washington, D.C. Dulles Intl Airport to Castries from $552

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to Castries departing on 12/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Washington, D.C. Dulles Intl Airport to Castries

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
10:09 pm - 7:00 pm
IAD
-
SLU
19h 51m2 stops
Multiple Airlines Logo
12:35 pm - 3:49 pm
SLU
-
IAD
28h 14m3 stops
$1,467Multiple Airlines
Thu, Feb 19 - Mon, Feb 23
Multiple Airlines Logo
9:55 am - 1:10 pm
IAD
-
SLU
27h 15m3 stops
Multiple Airlines Logo
6:20 pm - 5:14 pm
SLU
-
IAD
22h 54m2 stops
$1,469Multiple Airlines
Fri, Apr 10 - Sat, Apr 18
Multiple Airlines Logo
5:46 pm - 7:00 pm
IAD
-
SLU
24h 14m3 stops
Multiple Airlines Logo
12:35 pm - 3:49 pm
SLU
-
IAD
28h 14m3 stops
$1,500Multiple Airlines
Thu, Feb 19 - Mon, Feb 23
Multiple Airlines Logo
5:17 pm - 1:10 pm
IAD
-
SLU
19h 53m2 stops
Multiple Airlines Logo
6:20 pm - 5:14 pm
SLU
-
IAD
22h 54m2 stops
$1,720Multiple Airlines
Fri, Apr 10 - Sat, Apr 18
Multiple Airlines Logo
5:16 pm - 1:10 pm
IAD
-
SLU
18h 54m2 stops
Multiple Airlines Logo
5:00 am - 11:35 am
SLU
-
IAD
31h 35m3 stops
$2,308Multiple Airlines
Wed, Dec 31 - Sun, Jan 4
Multiple Airlines Logo
5:16 pm - 2:35 pm
IAD
-
SLU
20h 19m3 stops
Multiple Airlines Logo
5:00 am - 11:35 am
SLU
-
IAD
31h 35m3 stops
$2,330Multiple Airlines
Wed, Dec 31 - Sun, Jan 4
Multiple Airlines Logo
4:30 pm - 1:10 pm
IAD
-
SLU
19h 40m2 stops
Multiple Airlines Logo
4:20 pm - 8:29 pm
SLU
-
IAD
53h 09m2 stops
$3,365Multiple Airlines
Fri, Feb 20 - Mon, Feb 23
Multiple Airlines Logo
10:06 pm - 1:10 pm
IAD
-
SLU
38h 04m2 stops
Multiple Airlines Logo
6:20 pm - 8:29 pm
SLU
-
IAD
51h 09m2 stops
$3,469Multiple Airlines
Tue, Dec 30 - Sat, Jan 3
Multiple Airlines Logo
10:06 pm - 3:35 pm
IAD
-
SLU
40h 29m2 stops
Multiple Airlines Logo
12:15 pm - 8:26 pm
SLU
-
IAD
33h 11m2 stops
$3,490Multiple Airlines
Sat, Jan 3 - Fri, Jan 9

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport to Castries that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 16, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Castries that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Thu 2/19

10:09 pm-7:00 pm

2 stops19h 51m

Castries George F. L. Charle

Mon 2/23

12:35 pm-3:49 pm

3 stops28h 14m

$1,467

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Fri 4/10

9:55 am-1:10 pm

3 stops27h 15m

Castries George F. L. Charle

Sat 4/18

6:20 pm-5:14 pm

2 stops22h 54m

$1,469

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Thu 2/19

5:46 pm-7:00 pm

3 stops24h 14m

Castries George F. L. Charle

Mon 2/23

12:35 pm-3:49 pm

3 stops28h 14m

$1,500

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Fri 4/10

5:17 pm-1:10 pm

2 stops19h 53m

Castries George F. L. Charle

Sat 4/18

6:20 pm-5:14 pm

2 stops22h 54m

$1,720

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Wed 12/31

5:16 pm-1:10 pm

2 stops18h 54m

Castries George F. L. Charle

Sun 1/4

5:00 am-11:35 am

3 stops31h 35m

$2,308

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Wed 12/31

5:16 pm-2:35 pm

3 stops20h 19m

Castries George F. L. Charle

Sun 1/4

5:00 am-11:35 am

3 stops31h 35m

$2,330

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Fri 2/20

4:30 pm-1:10 pm

2 stops19h 40m

Castries George F. L. Charle

Mon 2/23

4:20 pm-8:29 pm

2 stops53h 09m

$3,365

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Tue 12/30

10:06 pm-1:10 pm

2 stops38h 04m

Castries George F. L. Charle

Sat 1/3

6:20 pm-8:29 pm

2 stops51h 09m

$3,469

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Sat 1/3

10:06 pm-3:35 pm

2 stops40h 29m

Castries George F. L. Charle

Fri 1/9

12:15 pm-8:26 pm

2 stops33h 11m

$3,490

Washington, D.C.Castries

IAD - SLU

IADSLU

Washington, D.C. Dulles Intl

Sun 12/21

8:26 pm-8:45 am

2 stops35h 19m

$552

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 11 resultsSorted by cheapest first
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See travel insights to Castries from

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to Castries

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Castries?

The cheapest day to depart from Washington, D.C. Dulles Intl Airport to Castries is on a Monday when prices can be found for as low as $671. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $849. These prices are subject to change though, so be sure to set up a Price Alert for flights to Castries.

What is the cheapest time of day to depart on your flight to Castries?

According to our data, the cheapest time of day to fly to Castries is in the evening. momondo users have found flights departing from Washington, D.C. Dulles Intl Airport to Castries in the evening for as low as $715. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Castries are more costly in the morning, with an average ticket price of $764. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Washington, D.C. Dulles Intl Airport to Castries

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to Castries according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. Dulles Intl Airport to Castries (IAD to SLU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to Castries

Fastest flight time

18h 54m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Castries takes 18h 54m
There are no direct flights from Washington, D.C. Dulles Intl Airport to Castries. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Castries.
Search flight deals

  • How far is Washington, D.C. Dulles Intl to Castries George F. L. Charle by plane?

    There are 1992.4 mi between Washington, D.C. Dulles Intl and Castries George F. L. Charle. Typically, this will take 18h 54m by plane in normal conditions.

  • When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Castries George F. L. Charle Airport?

    Prices for flights from Washington, D.C. Dulles Intl Airport to Castries George F. L. Charle Airport are updated daily.

  • How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Castries George F. L. Charle Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Castries George F. L. Charle Airport.

  • What documentation or ID do you need to fly to Castries George F. L. Charle Airport?

    The required travel and health documents for your Castries George F. L. Charle Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Castries George F. L. Charle Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near Castries?

Book flights to Castries if you plan to visit one of these locations
Gros Islet
Rodney Bay
Marigot Bay

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Castries?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Castries from Washington, D.C..

Can I find flights from Washington, D.C. to Castries with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Washington, D.C. to Castries flights to just show those with flexible booking policies.

How can momondo help me find flights from Washington, D.C. to Castries?

momondo helps you find the best flight between Washington, D.C. and Castries by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Washington, D.C. to Castries right now. Can momondo alert me if prices change?

Price alerts on flights to Castries from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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