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Cheap flights from Washington, D.C. Dulles Intl Airport to Cardiff from $322

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 Cardiff departing on 7/15. 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. Dulles Intl Airport to Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
5:15 pm - 10:50 pm
IAD
-
CWL
24h 35m
1 stop
Multiple Airlines Logo
9:45 pm - 7:00 pm
CWL
-
IAD
26h 15m
2 stops
$789Multiple Airlines
Mon, Jun 8 - Tue, Jun 16
Multiple Airlines Logo
8:30 pm - 10:50 pm
IAD
-
CWL
21h 20m
3 stops
Multiple Airlines Logo
10:50 pm - 3:10 pm
CWL
-
IAD
21h 20m
2 stops
$802Multiple Airlines
Mon, Apr 13 - Thu, Apr 16
Multiple Airlines Logo
9:05 pm - 11:25 pm
IAD
-
CWL
21h 20m
1 stop
Multiple Airlines Logo
9:45 pm - 7:00 pm
CWL
-
IAD
26h 15m
2 stops
$814Multiple Airlines
Tue, Jun 9 - Tue, Jun 16
KLM Logo
5:40 pm - 4:45 pm
IAD
-
CWL
18h 05m
1 stop
KLM Logo
9:45 am - 3:35 pm
CWL
-
IAD
10h 50m
1 stop
$820KLM
Thu, Apr 16 - Thu, Apr 23
Virgin Atlantic Logo
6:10 pm - 4:45 pm
IAD
-
CWL
17h 35m
1 stop
Virgin Atlantic Logo
9:45 am - 3:35 pm
CWL
-
IAD
10h 50m
1 stop
$821Virgin Atlantic
Mon, Apr 13 - Mon, Apr 20
KLM Logo
5:40 pm - 9:15 am
IAD
-
CWL
10h 35m
1 stop
KLM Logo
5:15 pm - 3:35 pm
CWL
-
IAD
27h 20m
1 stop
$822KLM
Tue, Apr 14 - Tue, Apr 21
Multiple Airlines Logo
5:40 pm - 9:15 am
IAD
-
CWL
10h 35m
1 stop
Multiple Airlines Logo
9:45 am - 8:52 pm
CWL
-
IAD
16h 07m
2 stops
$825Multiple Airlines
Thu, Apr 16 - Thu, Apr 23
KLM Logo
12:45 pm - 9:15 am
IAD
-
CWL
15h 30m
2 stops
KLM Logo
5:15 pm - 3:35 pm
CWL
-
IAD
27h 20m
1 stop
$827KLM
Mon, Apr 20 - Sun, Apr 26
Delta Logo
6:10 pm - 9:15 am
IAD
-
CWL
10h 05m
1 stop
Delta Logo
9:45 am - 11:03 pm
CWL
-
IAD
18h 18m
2 stops
$831Delta
Mon, Apr 13 - Mon, Apr 20
Delta Logo
5:40 pm - 4:45 pm
IAD
-
CWL
18h 05m
1 stop
Delta Logo
9:45 am - 11:32 pm
CWL
-
IAD
18h 47m
2 stops
$832Delta
Tue, Apr 14 - Tue, Apr 21

Delta flights from Washington, D.C. Dulles Intl Airport to Cardiff

Our best Delta deals on Washington, D.C. Dulles Intl Airport to Cardiff flight tickets
Delta
Apr 13
IAD6:10 pmWashington, D.C. Dulles Intl
10h 05m
1 stop
CWL9:15 amCardiff Wales
Apr 20
CWL9:45 amCardiff Wales
18h 18m
2 stops
IAD11:03 pmWashington, D.C. Dulles Intl
$831
Delta
Apr 14
IAD5:40 pmWashington, D.C. Dulles Intl
18h 05m
1 stop
CWL4:45 pmCardiff Wales
Apr 21
CWL9:45 amCardiff Wales
18h 47m
2 stops
IAD11:32 pmWashington, D.C. Dulles Intl
$832
Delta
Apr 14
IAD6:50 pmWashington, D.C. Dulles Intl
16h 55m
2 stops
CWL4:45 pmCardiff Wales
Apr 21
CWL9:45 amCardiff Wales
18h 47m
2 stops
IAD11:32 pmWashington, D.C. Dulles Intl
$927

KLM flights from Washington, D.C. Dulles Intl Airport to Cardiff

Our best KLM deals on Washington, D.C. Dulles Intl Airport to Cardiff flight tickets
KLM
Apr 16
IAD5:40 pmWashington, D.C. Dulles Intl
18h 05m
1 stop
CWL4:45 pmCardiff Wales
Apr 23
CWL9:45 amCardiff Wales
10h 50m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$820
KLM
Apr 14
IAD5:40 pmWashington, D.C. Dulles Intl
10h 35m
1 stop
CWL9:15 amCardiff Wales
Apr 21
CWL5:15 pmCardiff Wales
27h 20m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$822
KLM
Apr 20
IAD12:45 pmWashington, D.C. Dulles Intl
15h 30m
2 stops
CWL9:15 amCardiff Wales
Apr 26
CWL5:15 pmCardiff Wales
27h 20m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$827

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport 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 March 3, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport 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

Mon 6/8

5:15 pm-10:50 pm

1 stop24h 35m

Cardiff Wales

Tue 6/16

9:45 pm-7:00 pm

2 stops26h 15m

$789

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 4/13

8:30 pm-10:50 pm

3 stops21h 20m

Cardiff Wales

Thu 4/16

10:50 pm-3:10 pm

2 stops21h 20m

$802

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Tue 6/9

9:05 pm-11:25 pm

1 stop21h 20m

Cardiff Wales

Tue 6/16

9:45 pm-7:00 pm

2 stops26h 15m

$814

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 4/16

5:40 pm-4:45 pm

1 stop18h 05m

Cardiff Wales

Thu 4/23

9:45 am-3:35 pm

1 stop10h 50m

$820

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 4/13

6:10 pm-4:45 pm

1 stop17h 35m

Cardiff Wales

Mon 4/20

9:45 am-3:35 pm

1 stop10h 50m

$821

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Tue 4/14

5:40 pm-9:15 am

1 stop10h 35m

Cardiff Wales

Tue 4/21

5:15 pm-3:35 pm

1 stop27h 20m

$822

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 4/16

5:40 pm-9:15 am

1 stop10h 35m

Cardiff Wales

Thu 4/23

9:45 am-8:52 pm

2 stops16h 07m

$825

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 4/20

12:45 pm-9:15 am

2 stops15h 30m

Cardiff Wales

Sun 4/26

5:15 pm-3:35 pm

1 stop27h 20m

$827

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 4/13

6:10 pm-9:15 am

1 stop10h 05m

Cardiff Wales

Mon 4/20

9:45 am-11:03 pm

2 stops18h 18m

$831

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Tue 4/14

5:40 pm-4:45 pm

1 stop18h 05m

Cardiff Wales

Tue 4/21

9:45 am-11:32 pm

2 stops18h 47m

$832

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
1
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When to book flights from Washington, D.C. Dulles Intl Airport to Cardiff

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to Cardiff (IAD to CWL) flight deals and tips

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

Fastest flight time

13h 15m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Cardiff takes 13h 15m
There are no direct flights from Washington, D.C. Dulles Intl Airport to Cardiff. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Cardiff.
Search flight deals

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

    Cardiff Wales is 3552.6 mi away from Washington, D.C. Dulles Intl. In terms of flight time, this usually takes a little over 13h 15m.

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

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

  • How old do you have to be to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport 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.

  • How do I get Price Alerts for flights from Washington, D.C. Dulles Intl Airport to Cardiff?

    Confirm your travel details to search for the latest offers for flights from Washington, D.C. Dulles Intl Airport to Cardiff. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Washington, D.C. Dulles Intl Airport to Cardiff with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Why use momondo?

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

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 Cardiff from Washington, D.C..

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

Yes. momondo enables you to select and highlight flights to Cardiff from Washington, D.C. with this policy.

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

Once you have performed a search for Washington, D.C. to Cardiff flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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