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Cheap flights from Washington, D.C. to Cardiff from $781

This is the cheapest round-trip 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 2/4. 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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Find the cheapest flights from Washington, D.C. to Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
KLM Logo
7:30 pm - 4:55 pm
IAD
-
CWL
16h 25m2 stops
KLM Logo
5:25 pm - 4:05 pm
CWL
-
IAD
27h 40m1 stop
$781KLM
Wed, Feb 4 - Wed, Feb 11
KLM Logo
7:30 pm - 4:55 pm
IAD
-
CWL
16h 25m2 stops
KLM Logo
5:25 pm - 4:05 pm
CWL
-
IAD
27h 40m1 stop
$784KLM
Wed, Feb 4 - Wed, Feb 11
Delta Logo
11:10 am - 9:50 am
DCA
-
CWL
17h 40m2 stops
Delta Logo
10:15 am - 12:57 pm
CWL
-
DCA
31h 42m2 stops
$785Delta
Wed, Jan 7 - Sun, Jan 11
KLM Logo
1:02 pm - 9:50 am
BWI
-
CWL
15h 48m2 stops
KLM Logo
10:20 am - 11:05 pm
CWL
-
BWI
17h 45m2 stops
$786KLM
Wed, Feb 4 - Wed, Feb 11
KLM Logo
7:30 pm - 4:55 pm
DCA
-
CWL
16h 25m2 stops
KLM Logo
10:20 am - 10:57 pm
CWL
-
DCA
17h 37m2 stops
$786KLM
Wed, Feb 4 - Wed, Feb 11
KLM Logo
12:40 pm - 9:50 am
IAD
-
CWL
16h 10m2 stops
KLM Logo
10:20 am - 11:09 pm
CWL
-
IAD
17h 49m2 stops
$786KLM
Thu, Feb 5 - Thu, Feb 12
Virgin Atlantic Logo
6:05 pm - 4:55 pm
IAD
-
CWL
17h 50m1 stop
Virgin Atlantic Logo
10:20 am - 7:09 pm
CWL
-
IAD
13h 49m2 stops
$790Virgin Atlantic
Tue, Feb 3 - Tue, Feb 10
Delta Logo
3:39 pm - 9:50 am
BWI
-
CWL
13h 11m2 stops
Delta Logo
10:20 am - 11:05 pm
CWL
-
BWI
17h 45m2 stops
$794Delta
Tue, Feb 3 - Tue, Feb 10
Multiple Airlines Logo
7:40 pm - 9:50 am
IAD
-
CWL
33h 10m3 stops
Multiple Airlines Logo
3:55 pm - 3:15 pm
CWL
-
IAD
28h 20m2 stops
$977Multiple Airlines
Wed, Feb 4 - Wed, Feb 11
Multiple Airlines Logo
5:05 pm - 10:05 am
IAD
-
CWL
12h 00m1 stop
Multiple Airlines Logo
3:55 pm - 3:35 pm
CWL
-
IAD
28h 40m1 stop
$994Multiple Airlines
Wed, Feb 4 - Wed, Feb 11

KLM flights from Washington, D.C. to Cardiff

Our best KLM deals on Washington, D.C. to Cardiff flight tickets
KLM
Feb 4
IAD7:30 pmWashington, D.C. Dulles Intl
16h 25m
2 stops
CWL4:55 pmCardiff Wales
Feb 11
CWL5:25 pmCardiff Wales
27h 40m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$781
Find similar
KLM
Feb 4
IAD7:30 pmWashington, D.C. Dulles Intl
16h 25m
2 stops
CWL4:55 pmCardiff Wales
Feb 11
CWL5:25 pmCardiff Wales
27h 40m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$784
Find similar
KLM
Feb 4
BWI1:02 pmBaltimore/Washington
15h 48m
2 stops
CWL9:50 amCardiff Wales
Feb 11
CWL10:20 amCardiff Wales
17h 45m
2 stops
BWI11:05 pmBaltimore/Washington
$786
Find similar

Delta flights from Washington, D.C. to Cardiff

Our best Delta deals on Washington, D.C. to Cardiff flight tickets
Delta
Jan 7
DCA11:10 amWashington, D.C. Reagan-National
17h 40m
2 stops
CWL9:50 amCardiff Wales
Jan 11
CWL10:15 amCardiff Wales
31h 42m
2 stops
DCA12:57 pmWashington, D.C. Reagan-National
$785
Find similar
Delta
Feb 3
BWI3:39 pmBaltimore/Washington
13h 11m
2 stops
CWL9:50 amCardiff Wales
Feb 10
CWL10:20 amCardiff Wales
17h 45m
2 stops
BWI11:05 pmBaltimore/Washington
$794
Find similar
Delta
Dec 27
IAD6:05 pmWashington, D.C. Dulles Intl
10h 40m
1 stop
CWL9:45 amCardiff Wales
Dec 31
CWL10:20 amCardiff Wales
28h 29m
2 stops
IAD9:49 amWashington, D.C. Dulles Intl
$2,162
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 December 23, 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

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 2/4

7:30 pm-4:55 pm

2 stops16h 25m

Cardiff Wales

Wed 2/11

5:25 pm-4:05 pm

1 stop27h 40m

$781

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 2/4

7:30 pm-4:55 pm

2 stops16h 25m

Cardiff Wales

Wed 2/11

5:25 pm-4:05 pm

1 stop27h 40m

$784

Washington, D.C.Cardiff

DCA - CWL

DCACWL

Washington, D.C. Reagan-National

Wed 1/7

11:10 am-9:50 am

2 stops17h 40m

Cardiff Wales

Sun 1/11

10:15 am-12:57 pm

2 stops31h 42m

$785

BaltimoreCardiff

BWI - CWL

BWICWL

Baltimore/Washington

Wed 2/4

1:02 pm-9:50 am

2 stops15h 48m

Cardiff Wales

Wed 2/11

10:20 am-11:05 pm

2 stops17h 45m

$786

Washington, D.C.Cardiff

DCA - CWL

DCACWL

Washington, D.C. Reagan-National

Wed 2/4

7:30 pm-4:55 pm

2 stops16h 25m

Cardiff Wales

Wed 2/11

10:20 am-10:57 pm

2 stops17h 37m

$786

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 2/5

12:40 pm-9:50 am

2 stops16h 10m

Cardiff Wales

Thu 2/12

10:20 am-11:09 pm

2 stops17h 49m

$786

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Tue 2/3

6:05 pm-4:55 pm

1 stop17h 50m

Cardiff Wales

Tue 2/10

10:20 am-7:09 pm

2 stops13h 49m

$790

BaltimoreCardiff

BWI - CWL

BWICWL

Baltimore/Washington

Tue 2/3

3:39 pm-9:50 am

2 stops13h 11m

Cardiff Wales

Tue 2/10

10:20 am-11:05 pm

2 stops17h 45m

$794

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 2/4

7:40 pm-9:50 am

3 stops33h 10m

Cardiff Wales

Wed 2/11

3:55 pm-3:15 pm

2 stops28h 20m

$977

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 2/4

5:05 pm-10:05 am

1 stop12h 00m

Cardiff Wales

Wed 2/11

3:55 pm-3:35 pm

1 stop28h 40m

$994

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

Fastest flight time

10h 40m

Direct flights

None
The fastest flight from Washington, D.C. to Cardiff takes 10h 40m
There are no direct flights from Washington, D.C. to Cardiff. There are no popular flight routes from Washington, D.C. to Cardiff.
Search flight deals

  • How far is Washington, D.C. to Cardiff Wales by plane?

    Cardiff Wales is 3537.5 mi away from Washington, D.C.. 10h 40m 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 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?

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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Aer Lingus