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Cheap flights from Cardiff to Washington, D.C. from £359

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 21/6. 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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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
07:30 - 15:45
CWL
-
IAD
13h 15m
1 stop
Multiple Airlines Logo
20:45 - 21:20
IAD
-
CWL
19h 35m
1 stop
£535Multiple Airlines
Sat, 4 Jul - Sat, 11 Jul
Multiple Airlines Logo
23:30 - 20:40
CWL
-
IAD
26h 10m
3 stops
Multiple Airlines Logo
08:18 - 10:15
IAD
-
CWL
20h 57m
2 stops
£654Multiple Airlines
Wed, 17 Jun - Wed, 24 Jun
Multiple Airlines Logo
23:30 - 20:40
CWL
-
IAD
26h 10m
3 stops
Multiple Airlines Logo
09:55 - 10:15
IAD
-
CWL
19h 20m
1 stop
£685Multiple Airlines
Wed, 17 Jun - Wed, 24 Jun
Multiple Airlines Logo
17:40 - 20:29
CWL
-
IAD
31h 49m
3 stops
Multiple Airlines Logo
08:18 - 10:15
IAD
-
CWL
20h 57m
2 stops
£687Multiple Airlines
Sun, 7 Jun - Sun, 21 Jun
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
£826Air France
Thu, 1 Oct - Thu, 8 Oct
KLM Logo
09:45 - 21:50
CWL
-
DCA
17h 05m
2 stops
KLM Logo
15:30 - 09:15
DCA
-
CWL
12h 45m
2 stops
£848KLM
Thu, 1 Oct - Thu, 8 Oct
KLM Logo
09:45 - 20:51
CWL
-
BWI
16h 06m
2 stops
KLM Logo
13:00 - 09:15
BWI
-
CWL
15h 15m
2 stops
£889KLM
Thu, 1 Oct - Thu, 8 Oct
Air France Logo
17:15 - 18:46
CWL
-
BWI
30h 31m
2 stops
Air France Logo
13:00 - 16:45
BWI
-
CWL
22h 45m
2 stops
£912Air France
Fri, 16 Oct - Mon, 19 Oct
WestJet Logo
11:35 - 23:18
CWL
-
BWI
16h 43m
2 stops
WestJet Logo
11:12 - 10:15
BWI
-
CWL
42h 03m
2 stops
£1,120WestJet
Sat, 4 Jul - Sat, 11 Jul
British Airways Logo
12:00 - 19:40
CWL
-
BWI
36h 40m
2 stops
British Airways Logo
21:35 - 11:30
BWI
-
CWL
32h 55m
2 stops
£1,161British Airways
Sun, 7 Jun - Sun, 21 Jun

Air France flights from Cardiff to Washington, D.C.

Our best Air France deals on Cardiff to Washington, D.C. flight tickets
Air France
1 Oct
CWL09:45Cardiff Wales
10h 50m
1 stop
IAD15:35Washington, D.C. Dulles Intl
8 Oct
IAD17:40Washington, D.C. Dulles Intl
18h 05m
1 stop
CWL16:45Cardiff Wales
£826
Air France
16 Oct
CWL17:15Cardiff Wales
30h 31m
2 stops
BWI18:46Baltimore/Washington
19 Oct
BWI13:00Baltimore/Washington
22h 45m
2 stops
CWL16:45Cardiff Wales
£912
Air France
18 Jun
CWL09:45Cardiff Wales
10h 50m
1 stop
IAD15:35Washington, D.C. Dulles Intl
25 Jun
IAD17:40Washington, D.C. Dulles Intl
18h 05m
1 stop
CWL16:45Cardiff Wales
£949

KLM flights from Cardiff to Washington, D.C.

Our best KLM deals on Cardiff to Washington, D.C. flight tickets
KLM
1 Oct
CWL09:45Cardiff Wales
17h 05m
2 stops
DCA21:50Washington, D.C. Reagan-National
8 Oct
DCA15:30Washington, D.C. Reagan-National
12h 45m
2 stops
CWL09:15Cardiff Wales
£848
KLM
1 Oct
CWL09:45Cardiff Wales
16h 06m
2 stops
BWI20:51Baltimore/Washington
8 Oct
BWI13:00Baltimore/Washington
15h 15m
2 stops
CWL09:15Cardiff Wales
£889
KLM
12 Jun
CWL17:15Cardiff Wales
27h 20m
1 stop
IAD15:35Washington, D.C. Dulles Intl
18 Jun
IAD19:14Washington, D.C. Dulles Intl
40h 51m
2 stops
CWL17:05Cardiff Wales
£1,044

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 21 May 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

Sat 4/7

07:30-15:45

1 stop13h 15m

Washington, D.C. Dulles Intl

Sat 11/7

20:45-21:20

1 stop19h 35m

£535

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 17/6

23:30-20:40

3 stops26h 10m

Washington, D.C. Dulles Intl

Wed 24/6

08:18-10:15

2 stops20h 57m

£654

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 17/6

23:30-20:40

3 stops26h 10m

Washington, D.C. Dulles Intl

Wed 24/6

09:55-10:15

1 stop19h 20m

£685

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 7/6

17:40-20:29

3 stops31h 49m

Washington, D.C. Dulles Intl

Sun 21/6

08:18-10:15

2 stops20h 57m

£687
Fastest return journey

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Thu 1/10

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Thu 8/10

17:40-16:45

1 stop18h 05m

£826

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Thu 1/10

09:45-21:50

2 stops17h 05m

Washington, D.C. Reagan-National

Thu 8/10

15:30-09:15

2 stops12h 45m

£848

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Thu 1/10

09:45-20:51

2 stops16h 06m

Baltimore/Washington

Thu 8/10

13:00-09:15

2 stops15h 15m

£889

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Fri 16/10

17:15-18:46

2 stops30h 31m

Baltimore/Washington

Mon 19/10

13:00-16:45

2 stops22h 45m

£912

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Sat 4/7

11:35-23:18

2 stops16h 43m

Baltimore/Washington

Sat 11/7

11:12-10:15

2 stops42h 03m

£1,120

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Sun 7/6

12:00-19:40

2 stops36h 40m

Baltimore/Washington

Sun 21/6

21:35-11:30

2 stops32h 55m

£1,161

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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

What is the cheapest airline that flies from Cardiff Wales to Washington, D.C.?

British Airways and KLM are the most popular carriers operating from Cardiff Wales to Washington, D.C.

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

13h 15m

Direct flights

None
The fastest flight from Cardiff to Washington, D.C. takes 13h 15m
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.. 13h 15m 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.?

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
Glen Burnie
Laurel
Ellicott City
Cambridge
Lutherville Timonium
Westminster
Lexington Park
Woodbridge
Bethesda
Owings Mills
Silver Spring
Rockville
Landover

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