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Cheap flights from Cardiff to Washington, D.C. from £365

This is the cheapest one-way 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 18/9. 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
Voted winner of Europe's Best Travel App 2023

Find the cheapest flights from Cardiff to Washington, D.C.

Cheap return flights

Enter your travel dates to find the best prices.
KLM Logo
17:30 - 15:45
CWL
-
IAD
27h 15m
1 stop
KLM Logo
18:15 - 17:00
IAD
-
CWL
17h 45m
1 stop
£653KLM
Mon, 2 Nov - Sat, 21 Nov
Delta Logo
10:20 - 23:11
CWL
-
IAD
17h 51m
2 stops
Delta Logo
18:15 - 09:50
IAD
-
CWL
10h 35m
1 stop
£657Delta
Mon, 2 Nov - Sat, 21 Nov
Delta Logo
10:20 - 23:04
CWL
-
DCA
17h 44m
2 stops
Delta Logo
12:00 - 09:50
DCA
-
CWL
16h 50m
2 stops
£657Delta
Mon, 2 Nov - Sat, 21 Nov
Virgin Atlantic Logo
17:30 - 23:11
CWL
-
IAD
34h 41m
2 stops
Virgin Atlantic Logo
13:00 - 17:00
IAD
-
CWL
23h 00m
2 stops
£663Virgin Atlantic
Mon, 2 Nov - Sat, 21 Nov
Virgin Atlantic Logo
10:20 - 21:35
CWL
-
BWI
40h 15m
2 stops
Virgin Atlantic Logo
12:15 - 17:00
BWI
-
CWL
23h 45m
2 stops
£668Virgin Atlantic
Mon, 2 Nov - Sat, 21 Nov
Multiple Airlines Logo
14:45 - 15:10
CWL
-
IAD
29h 25m
2 stops
Multiple Airlines Logo
17:15 - 21:45
IAD
-
CWL
23h 30m
1 stop
£688Multiple Airlines
Sun, 30 Aug - Sun, 6 Sep
Multiple Airlines Logo
09:50 - 15:35
CWL
-
IAD
10h 45m
1 stop
Multiple Airlines Logo
17:40 - 09:15
IAD
-
CWL
10h 35m
1 stop
£695Multiple Airlines
Sun, 30 Aug - Sun, 6 Sep
Delta Logo
09:50 - 20:55
CWL
-
IAD
16h 05m
2 stops
Delta Logo
17:47 - 16:45
IAD
-
CWL
17h 58m
2 stops
£702Delta
Sun, 30 Aug - Sun, 6 Sep
Delta Logo
09:50 - 22:59
CWL
-
DCA
18h 09m
2 stops
Delta Logo
10:10 - 09:15
DCA
-
CWL
18h 05m
2 stops
£702Delta
Sun, 30 Aug - Sun, 6 Sep
Air France Logo
09:45 - 15:35
CWL
-
IAD
10h 50m
1 stop
Air France Logo
17:40 - 16:45
IAD
-
CWL
18h 05m
1 stop
£804Air France
Tue, 4 Aug - Tue, 18 Aug

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Delta flights from Cardiff to Washington, D.C.

Our best Delta deals on Cardiff to Washington, D.C. flight tickets
Delta
2 Nov
CWL10:20Cardiff Wales
17h 51m
2 stops
IAD23:11Washington, D.C. Dulles Intl
21 Nov
IAD18:15Washington, D.C. Dulles Intl
10h 35m
1 stop
CWL09:50Cardiff Wales
£657
Delta
30 Aug
CWL09:50Cardiff Wales
16h 05m
2 stops
IAD20:55Washington, D.C. Dulles Intl
6 Sept
IAD17:47Washington, D.C. Dulles Intl
17h 58m
2 stops
CWL16:45Cardiff Wales
£702
Delta
30 Aug
CWL09:50Cardiff Wales
18h 39m
2 stops
BWI23:29Baltimore/Washington
6 Sept
BWI17:36Baltimore/Washington
18h 09m
2 stops
CWL16:45Cardiff Wales
£747

KLM flights from Cardiff to Washington, D.C.

Our best KLM deals on Cardiff to Washington, D.C. flight tickets
KLM
2 Nov
CWL17:30Cardiff Wales
27h 15m
1 stop
IAD15:45Washington, D.C. Dulles Intl
21 Nov
IAD18:15Washington, D.C. Dulles Intl
17h 45m
1 stop
CWL17:00Cardiff Wales
£653
KLM
27 Aug
CWL17:15Cardiff Wales
27h 31m
2 stops
BWI15:46Baltimore/Washington
3 Sept
BWI14:18Baltimore/Washington
21h 27m
2 stops
CWL16:45Cardiff Wales
£740
KLM
6 Aug
CWL09:45Cardiff Wales
10h 50m
1 stop
IAD15:35Washington, D.C. Dulles Intl
20 Aug
IAD17:40Washington, D.C. Dulles Intl
10h 35m
1 stop
CWL09:15Cardiff Wales
£803

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 18 July 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 - IAD

CWLIAD

Cardiff Wales

Mon 2/11

17:30-15:45

1 stop27h 15m

Washington, D.C. Dulles Intl

Sat 21/11

18:15-17:00

1 stop17h 45m

£653

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Mon 2/11

10:20-23:11

2 stops17h 51m

Washington, D.C. Dulles Intl

Sat 21/11

18:15-09:50

1 stop10h 35m

£657

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Mon 2/11

10:20-23:04

2 stops17h 44m

Washington, D.C. Reagan-National

Sat 21/11

12:00-09:50

2 stops16h 50m

£657

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Mon 2/11

17:30-23:11

2 stops34h 41m

Washington, D.C. Dulles Intl

Sat 21/11

13:00-17:00

2 stops23h 00m

£663

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Mon 2/11

10:20-21:35

2 stops40h 15m

Baltimore/Washington

Sat 21/11

12:15-17:00

2 stops23h 45m

£668

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 30/8

14:45-15:10

2 stops29h 25m

Washington, D.C. Dulles Intl

Sun 6/9

17:15-21:45

1 stop23h 30m

£688
Fastest return journey

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 30/8

09:50-15:35

1 stop10h 45m

Washington, D.C. Dulles Intl

Sun 6/9

17:40-09:15

1 stop10h 35m

£695

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 30/8

09:50-20:55

2 stops16h 05m

Washington, D.C. Dulles Intl

Sun 6/9

17:47-16:45

2 stops17h 58m

£702

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Sun 30/8

09:50-22:59

2 stops18h 09m

Washington, D.C. Reagan-National

Sun 6/9

10:10-09:15

2 stops18h 05m

£702

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 4/8

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Tue 18/8

17:40-16:45

1 stop18h 05m

£804

Flights are sorted by cheapest return flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
1
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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Cardiff to Washington, D.C.

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

Can stopping save me money on Cardiff to Washington, D.C. flights?

You could potentially save up to 61% on your flight if you consider stops on a Cardiff to Washington, D.C. flight.

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

15h 43m

Direct flights

None
The fastest flight from Cardiff to Washington, D.C. takes 15h 43m
There are no direct flights from Cardiff to Washington, D.C.. There are no popular flight routes from Cardiff to Washington, D.C..
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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.. 15h 43m 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.

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

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

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.

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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