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Cheap flights from Washington, D.C. to Cardiff from $360

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. to Cardiff departing on 4/23. 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. to Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
10:28 am - 9:50 amBWI-CWL
18h 22m2 stops
Delta Logo
10:20 am - 10:08 pmCWL-BWI
40h 48m2 stops
$786Delta
Find Deal
Wed, Dec 3 - Sun, Dec 7
Virgin Atlantic Logo
5:02 pm - 9:50 amDCA-CWL
35h 48m2 stops
Virgin Atlantic Logo
5:30 pm - 6:26 pmCWL-DCA
29h 56m2 stops
$786Virgin Atlantic
Find Deal
Wed, Dec 3 - Sun, Dec 7

KLM flights from Washington, D.C. to Cardiff

Our best KLM deals on Washington, D.C. to Cardiff flight tickets
KLM
Nov 12
IAD6:05 pmWashington, D.C. Dulles Intl
17h 50m
1 stop
CWL4:55 pmCardiff Wales
Nov 16
CWL5:30 pmCardiff Wales
27h 35m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$823
Find similar
KLM
Nov 12
IAD12:11 pmWashington, D.C. Dulles Intl
16h 39m
2 stops
CWL9:50 amCardiff Wales
Nov 16
CWL5:30 pmCardiff Wales
27h 35m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$828
Find similar
KLM
Nov 12
IAD6:05 pmWashington, D.C. Dulles Intl
17h 50m
1 stop
CWL4:55 pmCardiff Wales
Nov 16
CWL5:30 pmCardiff Wales
34h 33m
2 stops
IAD11:03 pmWashington, D.C. Dulles Intl
$834
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Cardiff 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 November 4, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Cardiff that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreCardiff

BWI - CWL

BWICWL

Baltimore/Washington

Wed 12/3

10:28 am-9:50 am

2 stops18h 22m

Cardiff Wales

Sun 12/7

10:20 am-10:08 pm

2 stops40h 48m

$786

Washington, D.C.Cardiff

DCA - CWL

DCACWL

Washington, D.C. Reagan-National

Wed 12/3

5:02 pm-9:50 am

2 stops35h 48m

Cardiff Wales

Sun 12/7

5:30 pm-6:26 pm

2 stops29h 56m

$786

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 4/23

5:20 pm-9:55 pm

1 stop23h 35m

$360

Washington, D.C.Cardiff

DCA - CWL

DCACWL

Washington, D.C. Reagan-National

Thu 4/23

6:25 pm-4:45 pm

2 stops17h 20m

$475

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 4/23

12:30 pm-9:15 am

2 stops15h 45m

$475

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 4/23

5:45 pm-9:55 pm

3 stops23h 10m

$489

BaltimoreCardiff

BWI - CWL

BWICWL

Baltimore/Washington

Thu 4/23

11:35 pm-9:55 pm

3 stops17h 20m

$509

BaltimoreCardiff

BWI - CWL

BWICWL

Baltimore/Washington

Thu 4/23

8:30 pm-9:55 pm

2 stops20h 25m

$562

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Cardiff from

How to get the cheapest flight ticket from Washington, D.C. to Cardiff

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 Cardiff?

The cheapest day to depart on your flight to Cardiff is on a Tuesday when prices can be found for as low as $766. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $1,282. These prices are subject to change though, so be sure to set up a Price Alert for flights to Cardiff.

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

Flying to Cardiff from Washington, D.C. in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $799 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $809 on average. Flights to Cardiff from Washington, D.C. at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

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

Cheap Washington, D.C. to Cardiff (WAS to CWL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Cardiff

Direct flights

None
There are no direct flights from Washington, D.C. to Cardiff. There are no popular flight routes from Washington, D.C. to Cardiff.
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  • How far is Washington, D.C. to Cardiff Wales by plane?

    Cardiff Wales is 3537.5 mi away from Washington, D.C.. 18h 22m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Washington, D.C. to Cardiff Wales Airport?

    Prices for flights from Washington, D.C. to Cardiff Wales Airport refresh daily.

  • How many operators does momondo search for flights from Washington, D.C. to Cardiff Wales Airport?

  • How old do you have to be to fly from Washington, D.C. to Cardiff Wales Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. to Cardiff Wales Airport.

  • What documentation or ID do you need to fly to Cardiff Wales Airport?

    The necessary travel and health documents for your Cardiff Wales Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Washington, D.C. to Cardiff?

Best airlines flying from Washington, D.C. to Cardiff

Compare and see reviews for airlines that fly from Washington, D.C. to Cardiff with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom $765Free CancellationRating
7.7
1,405 reviews
Search KLM flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to Cardiff for you.

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

Yes. All flights to Cardiff from Washington, D.C. on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo provides multiple filters to help you find the best flight to Cardiff from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of Washington, D.C. to Cardiff flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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