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Cheap flights from Cardiff to Washington, D.C. from £456

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 14/9. 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

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

Cheap return flights

Enter your travel dates to find the best prices.
Delta Logo
09:45 - 15:35CWL  Cardiff Wales-IAD Washington, D.C. Dulles Intl
10h 50m1 stop Amsterdam Schiphol
Delta Logo
18:26 - 16:45IAD  Washington, D.C. Dulles Intl-CWL Cardiff Wales
17h 19m2 stops New York John F Kennedy Intl Amsterdam Schiphol
£641Delta
Mon, 28 Sep - Mon, 5 Oct
KLM Logo
09:45 - 22:03CWL  Cardiff Wales-DCA Washington, D.C. Reagan-National
17h 18m2 stops Amsterdam Schiphol Boston Logan Intl
KLM Logo
12:55 - 09:15DCA  Washington, D.C. Reagan-National-CWL Cardiff Wales
15h 20m2 stops Boston Logan Intl Amsterdam Schiphol
£645KLM
Mon, 28 Sep - Mon, 5 Oct
Delta Logo
09:45 - 22:31CWL  Cardiff Wales-BWI Baltimore/Washington
17h 46m2 stops Amsterdam Schiphol Boston Logan Intl
Delta Logo
12:30 - 09:15BWI  Baltimore/Washington-CWL Cardiff Wales
15h 45m2 stops Detroit Metropolitan Wayne County Amsterdam Schiphol
£645Delta
Mon, 28 Sep - Mon, 5 Oct
KLM Logo
09:45 - 15:35CWL  Cardiff Wales-IAD Washington, D.C. Dulles Intl
10h 50m1 stop Amsterdam Schiphol
KLM Logo
18:10 - 16:45IAD  Washington, D.C. Dulles Intl-CWL Cardiff Wales
17h 35m1 stop Amsterdam Schiphol
£665KLM
Sat, 5 Sep - Mon, 21 Sep
Virgin Atlantic Logo
09:45 - 00:41CWL  Cardiff Wales-IAD Washington, D.C. Dulles Intl
19h 56m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
Virgin Atlantic Logo
11:10 - 09:15IAD  Washington, D.C. Dulles Intl-CWL Cardiff Wales
17h 05m2 stops Detroit Metropolitan Wayne County Amsterdam Schiphol
£667Virgin Atlantic
Mon, 28 Sep - Mon, 5 Oct
KLM Logo
17:35 - 15:35CWL  Cardiff Wales-IAD Washington, D.C. Dulles Intl
27h 00m1 stop Amsterdam Schiphol
KLM Logo
17:30 - 09:15IAD  Washington, D.C. Dulles Intl-CWL Cardiff Wales
10h 45m1 stop Amsterdam Schiphol
£671KLM
Sat, 12 Sep - Sat, 19 Sep
Multiple Airlines Logo
07:30 - 20:24CWL  Cardiff Wales-IAD Washington, D.C. Dulles Intl
17h 54m2 stops Dublin Toronto Pearson Intl
Multiple Airlines Logo
20:30 - 22:50IAD  Washington, D.C. Dulles Intl-CWL Cardiff Wales
21h 20m2 stops Reykjavik Keflavik Intl Dublin
£676Multiple Airlines
Sat, 5 Sep - Mon, 21 Sep
Multiple Airlines Logo
07:30 - 20:24CWL  Cardiff Wales-IAD Washington, D.C. Dulles Intl
17h 54m2 stops Dublin Toronto Pearson Intl
Multiple Airlines Logo
20:30 - 22:50IAD  Washington, D.C. Dulles Intl-CWL Cardiff Wales
21h 20m3 stops Reykjavik Keflavik Intl London Gatwick Dublin
£682Multiple Airlines
Sat, 5 Sep - Mon, 21 Sep
Delta Logo
09:45 - 15:35CWL  Cardiff Wales-IAD Washington, D.C. Dulles Intl
10h 50m1 stop Amsterdam Schiphol
Delta Logo
12:25 - 09:15IAD  Washington, D.C. Dulles Intl-CWL Cardiff Wales
15h 50m2 stops New York John F Kennedy Intl Amsterdam Schiphol
£687Delta
Sat, 5 Sep - Mon, 21 Sep
Delta Logo
09:45 - 22:59CWL  Cardiff Wales-DCA Washington, D.C. Reagan-National
18h 14m2 stops Amsterdam Schiphol New York John F Kennedy Intl
Delta Logo
11:40 - 09:15DCA  Washington, D.C. Reagan-National-CWL Cardiff Wales
16h 35m2 stops Boston Logan Intl Amsterdam Schiphol
£691Delta
Sat, 5 Sep - Mon, 21 Sep

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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
28 Sept
CWL09:45Cardiff Wales
10h 50m
1 stop
IAD15:35Washington, D.C. Dulles Intl
5 Oct
IAD18:26Washington, D.C. Dulles Intl
17h 19m
2 stops
CWL16:45Cardiff Wales
£641
Delta
28 Sept
CWL09:45Cardiff Wales
17h 46m
2 stops
BWI22:31Baltimore/Washington
5 Oct
BWI12:30Baltimore/Washington
15h 45m
2 stops
CWL09:15Cardiff Wales
£645
Delta
5 Sept
CWL09:45Cardiff Wales
10h 50m
1 stop
IAD15:35Washington, D.C. Dulles Intl
21 Sept
IAD12:25Washington, D.C. Dulles Intl
15h 50m
2 stops
CWL09:15Cardiff Wales
£687

Virgin Atlantic flights from Cardiff to Washington, D.C.

Our best Virgin Atlantic deals on Cardiff to Washington, D.C. flight tickets
Virgin Atlantic
28 Sept
CWL09:45Cardiff Wales
19h 56m
2 stops
IAD00:41Washington, D.C. Dulles Intl
5 Oct
IAD11:10Washington, D.C. Dulles Intl
17h 05m
2 stops
CWL09:15Cardiff Wales
£667
Virgin Atlantic
20 Aug
CWL17:15Cardiff Wales
27h 20m
1 stop
IAD15:35Washington, D.C. Dulles Intl
17 Sept
IAD12:25Washington, D.C. Dulles Intl
15h 50m
2 stops
CWL09:15Cardiff Wales
£1,052

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 15 August 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 Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Mon 28/9

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Mon 5/10

18:26-16:45

2 stops17h 19m

£641

CardiffWashington, D.C.

CWL Cardiff Wales - DCA Washington, D.C. Reagan-National

CWLDCA

Cardiff Wales

Mon 28/9

09:45-22:03

2 stops17h 18m

Washington, D.C. Reagan-National

Mon 5/10

12:55-09:15

2 stops15h 20m

£645

CardiffBaltimore

CWL Cardiff Wales - BWI Baltimore/Washington

CWLBWI

Cardiff Wales

Mon 28/9

09:45-22:31

2 stops17h 46m

Baltimore/Washington

Mon 5/10

12:30-09:15

2 stops15h 45m

£645

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Sat 5/9

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Mon 21/9

18:10-16:45

1 stop17h 35m

£665

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Mon 28/9

09:45-00:41

2 stops19h 56m

Washington, D.C. Dulles Intl

Mon 5/10

11:10-09:15

2 stops17h 05m

£667

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Sat 12/9

17:35-15:35

1 stop27h 00m

Washington, D.C. Dulles Intl

Sat 19/9

17:30-09:15

1 stop10h 45m

£671

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Sat 5/9

07:30-20:24

2 stops17h 54m

Washington, D.C. Dulles Intl

Mon 21/9

20:30-22:50

2 stops21h 20m

£676

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Sat 5/9

07:30-20:24

2 stops17h 54m

Washington, D.C. Dulles Intl

Mon 21/9

20:30-22:50

3 stops21h 20m

£682
Fastest return journey

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Sat 5/9

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Mon 21/9

12:25-09:15

2 stops15h 50m

£687

CardiffWashington, D.C.

CWL Cardiff Wales - DCA Washington, D.C. Reagan-National

CWLDCA

Cardiff Wales

Sat 5/9

09:45-22:59

2 stops18h 14m

Washington, D.C. Reagan-National

Mon 21/9

11:40-09:15

2 stops16h 35m

£691

Flights are sorted by cheapest return flights first.

Showing 1-10 of 12 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

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

10h 50m

Direct flights

None
The fastest flight from Cardiff to Washington, D.C. takes 10h 50m
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.. 10h 50m 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
Woodbridge
Bethesda
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