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Cheap flights from Cardiff to Washington, D.C. from £777

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 29/5. 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.
Multiple Airlines Logo
17:15 - 21:55
CWL
-
DCA
33h 40m
3 stops
Multiple Airlines Logo
06:00 - 10:15
DCA
-
CWL
23h 15m
2 stops
£777Multiple Airlines
Fri, 29 May - Fri, 5 Jun
Multiple Airlines Logo
17:15 - 18:58
CWL
-
IAD
30h 43m
3 stops
Multiple Airlines Logo
09:45 - 10:15
IAD
-
CWL
19h 30m
2 stops
£862Multiple Airlines
Fri, 29 May - Fri, 5 Jun
Multiple Airlines Logo
17:15 - 21:55
CWL
-
DCA
33h 40m
3 stops
Multiple Airlines Logo
11:00 - 10:15
DCA
-
CWL
18h 15m
1 stop
£869Multiple Airlines
Fri, 29 May - Fri, 5 Jun
Multiple Airlines Logo
17:15 - 18:58
CWL
-
IAD
30h 43m
3 stops
Multiple Airlines Logo
09:55 - 10:15
IAD
-
CWL
19h 20m
1 stop
£875Multiple Airlines
Fri, 29 May - Fri, 5 Jun
KLM Logo
17:15 - 15:35
CWL
-
IAD
27h 20m
1 stop
KLM Logo
17:40 - 09:15
IAD
-
CWL
10h 35m
1 stop
£880KLM
Sun, 3 May - Sun, 10 May
KLM Logo
17:15 - 15:35
CWL
-
IAD
27h 20m
1 stop
KLM Logo
17:40 - 09:15
IAD
-
CWL
10h 35m
1 stop
£883KLM
Sun, 3 May - Sun, 10 May
KLM Logo
17:15 - 15:35
CWL
-
IAD
27h 20m
1 stop
KLM Logo
21:45 - 16:45
IAD
-
CWL
14h 00m
2 stops
£900KLM
Sun, 3 May - Sun, 10 May
KLM Logo
17:15 - 15:35
CWL
-
IAD
27h 20m
1 stop
KLM Logo
21:45 - 16:45
IAD
-
CWL
14h 00m
2 stops
£901KLM
Sun, 3 May - Sun, 10 May
KLM Logo
09:50 - 21:05
CWL
-
IAD
16h 15m
2 stops
KLM Logo
21:45 - 16:45
IAD
-
CWL
14h 00m
2 stops
£936KLM
Sun, 3 May - Sun, 10 May
Delta Logo
09:45 - 23:17
CWL
-
BWI
18h 32m
2 stops
Delta Logo
19:41 - 17:05
BWI
-
CWL
16h 24m
2 stops
£1,153Delta
Fri, 29 May - Fri, 5 Jun

KLM flights from Cardiff to Washington, D.C.

Our best KLM deals on Cardiff to Washington, D.C. flight tickets
KLM
3 May
CWL17:15Cardiff Wales
27h 20m
1 stop
IAD15:35Washington, D.C. Dulles Intl
10 May
IAD17:40Washington, D.C. Dulles Intl
10h 35m
1 stop
CWL09:15Cardiff Wales
£880
KLM
3 May
CWL17:15Cardiff Wales
27h 20m
1 stop
IAD15:35Washington, D.C. Dulles Intl
10 May
IAD17:40Washington, D.C. Dulles Intl
10h 35m
1 stop
CWL09:15Cardiff Wales
£883
KLM
3 May
CWL17:15Cardiff Wales
27h 20m
1 stop
IAD15:35Washington, D.C. Dulles Intl
10 May
IAD21:45Washington, D.C. Dulles Intl
14h 00m
2 stops
CWL16:45Cardiff Wales
£900

momondo Fare Finder

 
Customise your flight search to find flights from Cardiff to Washington, D.C. 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 17 April 2026.
Use the filters below to find and compare flights from Cardiff to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Fri 29/5

17:15-21:55

3 stops33h 40m

Washington, D.C. Reagan-National

Fri 5/6

06:00-10:15

2 stops23h 15m

£777

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Fri 29/5

17:15-18:58

3 stops30h 43m

Washington, D.C. Dulles Intl

Fri 5/6

09:45-10:15

2 stops19h 30m

£862

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Fri 29/5

17:15-21:55

3 stops33h 40m

Washington, D.C. Reagan-National

Fri 5/6

11:00-10:15

1 stop18h 15m

£869

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Fri 29/5

17:15-18:58

3 stops30h 43m

Washington, D.C. Dulles Intl

Fri 5/6

09:55-10:15

1 stop19h 20m

£875

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 3/5

17:15-15:35

1 stop27h 20m

Washington, D.C. Dulles Intl

Sun 10/5

17:40-09:15

1 stop10h 35m

£880

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 3/5

17:15-15:35

1 stop27h 20m

Washington, D.C. Dulles Intl

Sun 10/5

17:40-09:15

1 stop10h 35m

£883

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 3/5

17:15-15:35

1 stop27h 20m

Washington, D.C. Dulles Intl

Sun 10/5

21:45-16:45

2 stops14h 00m

£900

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 3/5

17:15-15:35

1 stop27h 20m

Washington, D.C. Dulles Intl

Sun 10/5

21:45-16:45

2 stops14h 00m

£901
Fastest return journey

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 3/5

09:50-21:05

2 stops16h 15m

Washington, D.C. Dulles Intl

Sun 10/5

21:45-16:45

2 stops14h 00m

£936

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Fri 29/5

09:45-23:17

2 stops18h 32m

Baltimore/Washington

Fri 5/6

19:41-17:05

2 stops16h 24m

£1,153

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

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

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

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

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

Fastest flight time

18h 32m

Direct flights

None
The fastest flight from Cardiff to Washington, D.C. takes 18h 32m
There are no direct flights from Cardiff to Washington, D.C.. There are no popular flight routes from Cardiff to Washington, D.C..
Search flight deals

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

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

    There are 3537.5 mi between Cardiff Wales and Washington, D.C.. 18h 32m is a normal flight duration for this route.

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

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

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

    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 Cardiff Wales Airport to Washington, D.C..

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

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

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

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

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

    Search flight deals from Cardiff to Washington, D.C.. While viewing offers you’ll have the option to create a Price Alert.

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

    By using tools like our “Price Calendar”, you can see the best days for return flights on 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 compare prices from 700+ competitors to help you find the price that works best for you. momondo operates in over 30 international markets, bringing you access to a wide range of fares and deals. Search for your travel using momondo for a diverse range of options from airlines and OTAs.

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

Book flights to Washington, D.C. if you plan to visit one of these locations
College Park
Fairfax
Arlington
Linthicum Heights
Glen Burnie
Laurel
Lutherville Timonium
Ellicott City
Cambridge
Lexington Park
Westminster
Woodbridge
Bethesda
Alexandria
Silver Spring
Rockville
Owings Mills
Landover
National Harbor

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

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

momondo helps you find the best flight between Cardiff and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes. momondo can track prices for Cardiff to Washington, D.C. flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport