Latest deals
When to book
FAQs
Price Alerts

Cheap flights from Washington, D.C. Dulles Intl Airport to Cardiff from $346

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 7/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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
4:00 pm - 10:15 am
IAD
-
CWL
13h 15m
1 stop
Multiple Airlines Logo
11:35 am - 3:10 pm
CWL
-
IAD
32h 35m
1 stop
$699Multiple Airlines
Sun, Jul 26 - Tue, Aug 11
Multiple Airlines Logo
4:00 pm - 10:15 am
IAD
-
CWL
13h 15m
1 stop
Multiple Airlines Logo
11:15 pm - 10:45 am
CWL
-
IAD
40h 30m
2 stops
$702Multiple Airlines
Sun, Jul 26 - Tue, Aug 11
Multiple Airlines Logo
4:00 pm - 10:15 am
IAD
-
CWL
13h 15m
1 stop
Multiple Airlines Logo
11:15 pm - 10:45 am
CWL
-
IAD
40h 30m
2 stops
$758Multiple Airlines
Sun, Jul 26 - Tue, Aug 11
Multiple Airlines Logo
4:20 pm - 10:15 am
IAD
-
CWL
12h 55m
1 stop
Multiple Airlines Logo
11:35 am - 8:24 pm
CWL
-
IAD
13h 49m
1 stop
$779Multiple Airlines
Mon, Jul 6 - Mon, Jul 13
Multiple Airlines Logo
4:00 pm - 10:15 am
IAD
-
CWL
13h 15m
1 stop
Multiple Airlines Logo
11:35 am - 10:46 am
CWL
-
IAD
28h 11m
1 stop
$788Multiple Airlines
Sun, Jul 12 - Thu, Jul 23
Multiple Airlines Logo
11:30 am - 10:15 am
IAD
-
CWL
17h 45m
1 stop
Multiple Airlines Logo
11:35 am - 3:16 pm
CWL
-
IAD
32h 41m
1 stop
$793Multiple Airlines
Fri, Jul 10 - Thu, Jul 23
Multiple Airlines Logo
4:00 pm - 10:15 am
IAD
-
CWL
13h 15m
1 stop
Multiple Airlines Logo
11:35 am - 10:46 am
CWL
-
IAD
28h 11m
1 stop
$832Multiple Airlines
Mon, Jul 6 - Thu, Jul 23
Multiple Airlines Logo
8:18 am - 10:15 am
IAD
-
CWL
20h 57m
2 stops
Multiple Airlines Logo
11:35 am - 3:01 pm
CWL
-
IAD
32h 26m
2 stops
$834Multiple Airlines
Mon, Jul 6 - Mon, Jul 13
Multiple Airlines Logo
9:45 am - 10:15 am
IAD
-
CWL
19h 30m
2 stops
Multiple Airlines Logo
11:35 am - 3:01 pm
CWL
-
IAD
32h 26m
2 stops
$861Multiple Airlines
Sun, Jul 26 - Tue, Aug 11
Multiple Airlines Logo
8:18 am - 10:15 am
IAD
-
CWL
20h 57m
2 stops
Multiple Airlines Logo
11:35 am - 8:24 pm
CWL
-
IAD
13h 49m
1 stop
$864Multiple Airlines
Mon, Jul 6 - Mon, Jul 13

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 June 6, 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

Cheapest round-trip

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Sun 7/26

4:00 pm-10:15 am

1 stop13h 15m

Cardiff Wales

Tue 8/11

11:35 am-3:10 pm

1 stop32h 35m

$699

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Sun 7/26

4:00 pm-10:15 am

1 stop13h 15m

Cardiff Wales

Tue 8/11

11:15 pm-10:45 am

2 stops40h 30m

$702

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Sun 7/26

4:00 pm-10:15 am

1 stop13h 15m

Cardiff Wales

Tue 8/11

11:15 pm-10:45 am

2 stops40h 30m

$758
Quickest round-trip

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 7/6

4:20 pm-10:15 am

1 stop12h 55m

Cardiff Wales

Mon 7/13

11:35 am-8:24 pm

1 stop13h 49m

$779

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Sun 7/12

4:00 pm-10:15 am

1 stop13h 15m

Cardiff Wales

Thu 7/23

11:35 am-10:46 am

1 stop28h 11m

$788

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Fri 7/10

11:30 am-10:15 am

1 stop17h 45m

Cardiff Wales

Thu 7/23

11:35 am-3:16 pm

1 stop32h 41m

$793

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 7/6

4:00 pm-10:15 am

1 stop13h 15m

Cardiff Wales

Thu 7/23

11:35 am-10:46 am

1 stop28h 11m

$832

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 7/6

8:18 am-10:15 am

2 stops20h 57m

Cardiff Wales

Mon 7/13

11:35 am-3:01 pm

2 stops32h 26m

$834

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Sun 7/26

9:45 am-10:15 am

2 stops19h 30m

Cardiff Wales

Tue 8/11

11:35 am-3:01 pm

2 stops32h 26m

$861

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 7/6

8:18 am-10:15 am

2 stops20h 57m

Cardiff Wales

Mon 7/13

11:35 am-8:24 pm

1 stop13h 49m

$864

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

10h 05m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Cardiff takes 10h 05m
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

Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to Cardiff

  • 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 10h 05m.

  • 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.

Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to Cardiff

  • 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.

An easier way to manage your Cardiff trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 7/6
Mon 7/13
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Fly your favorite airline to Cardiff

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Aer Lingus