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Cheap flights from Cardiff to Washington, D.C. from £541

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Cardiff to Washington, D.C. departing on 18/2. 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
0 bags
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Find the cheapest flights from Cardiff to Washington, D.C.

Cheap return flights

Enter your travel dates to find the best prices.
KLM Logo
17:25 - 16:05
CWL
-
IAD
27h 40m
1 stop
KLM Logo
18:05 - 16:55
IAD
-
CWL
17h 50m
1 stop
£541KLM
Wed, 18 Feb - Wed, 4 Mar
KLM Logo
17:25 - 16:05
CWL
-
IAD
27h 40m
1 stop
KLM Logo
12:24 - 09:50
IAD
-
CWL
16h 26m
2 stops
£544KLM
Wed, 18 Feb - Wed, 4 Mar
Delta Logo
10:20 - 00:21
CWL
-
IAD
19h 01m
2 stops
Delta Logo
12:24 - 09:50
IAD
-
CWL
16h 26m
2 stops
£549Delta
Wed, 18 Feb - Wed, 4 Mar
KLM Logo
17:15 - 16:28
CWL
-
IAD
28h 13m
2 stops
KLM Logo
12:38 - 09:50
IAD
-
CWL
16h 12m
2 stops
£551KLM
Mon, 23 Feb - Mon, 2 Mar
Multiple Airlines Logo
15:55 - 18:30
CWL
-
IAD
31h 35m
3 stops
Multiple Airlines Logo
20:30 - 21:30
IAD
-
CWL
20h 00m
2 stops
£1,049Multiple Airlines
Wed, 18 Feb - Wed, 4 Mar
Multiple Airlines Logo
15:55 - 18:30
CWL
-
IAD
31h 35m
3 stops
Multiple Airlines Logo
09:45 - 15:35
IAD
-
CWL
24h 50m
3 stops
£1,108Multiple Airlines
Wed, 18 Feb - Wed, 4 Mar

momondo Fare Finder

 
Customise your flight search to find flights from Cardiff to Washington, D.C. Dulles Intl Airport 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 279,928 searches. Data last updated 27 January 2026.
Use the filters below to find and compare flights from Cardiff to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 18/2

17:25-16:05

1 stop27h 40m

Washington, D.C. Dulles Intl

Wed 4/3

18:05-16:55

1 stop17h 50m

£541

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 18/2

17:25-16:05

1 stop27h 40m

Washington, D.C. Dulles Intl

Wed 4/3

12:24-09:50

2 stops16h 26m

£544

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 18/2

10:20-00:21

2 stops19h 01m

Washington, D.C. Dulles Intl

Wed 4/3

12:24-09:50

2 stops16h 26m

£549

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Mon 23/2

17:15-16:28

2 stops28h 13m

Washington, D.C. Dulles Intl

Mon 2/3

12:38-09:50

2 stops16h 12m

£551

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 18/2

15:55-18:30

3 stops31h 35m

Washington, D.C. Dulles Intl

Wed 4/3

20:30-21:30

2 stops20h 00m

£1,049

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 18/2

15:55-18:30

3 stops31h 35m

Washington, D.C. Dulles Intl

Wed 4/3

09:45-15:35

3 stops24h 50m

£1,108

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

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

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

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

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

Fastest flight time

27h 40m

Direct flights

None
The fastest flight from Cardiff to Washington, D.C. Dulles Intl Airport takes 27h 40m
There are no direct flights from Cardiff to Washington, D.C. Dulles Intl Airport. There are no popular flight routes from Cardiff to Washington, D.C. Dulles Intl Airport.
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  • How far is Cardiff Wales to Washington, D.C. Dulles Intl by plane?

    Cardiff Wales and Washington, D.C. Dulles Intl are 3552.6 mi apart from one another. A reasonable flight in good conditions will take 27h 40m.

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

    Prices for flights from Cardiff Wales Airport to Washington, D.C. Dulles Intl Airport were last updated today.

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

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The required travel and health documents for your Washington, D.C. Dulles Intl 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 Washington, D.C. Dulles Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

    Price Alerts will notify you by email when the price for flights to Washington, D.C. Dulles Intl Airport from Cardiff decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

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

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Travelling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Laurel
College Park
Fairfax
Arlington
Linthicum Heights
Alexandria
Glen Burnie
Lutherville Timonium
Front Royal
Winchester
Ellicott City
Cambridge
Lexington Park
Westminster
Woodbridge
Bethesda
Ashburn
Sterling
Rockville
Silver Spring

Why use momondo?

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

Finding the right flight to Washington, D.C. from Cardiff is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Washington, D.C. quick and easy, saving you time and money.

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

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

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

Once all potential Cardiff to Washington, D.C. flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are not ready to book a flight from Cardiff to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

An easier way to manage your Washington, D.C. Dulles Intl Airport trip

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