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Cheap flights from Cardiff to Washington, D.C. from £405

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 21/7. 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 - 22:28
CWL
-
DCA
19h 58m
2 stops
Multiple Airlines Logo
18:55 - 10:15
DCA
-
CWL
10h 20m
1 stop
£648Multiple Airlines
Sat, 6 Jun - Fri, 12 Jun
Multiple Airlines Logo
07:30 - 21:55
CWL
-
DCA
19h 25m
3 stops
Multiple Airlines Logo
18:55 - 10:15
DCA
-
CWL
10h 20m
1 stop
£655Multiple Airlines
Sat, 6 Jun - Fri, 12 Jun
Multiple Airlines Logo
11:35 - 22:28
CWL
-
DCA
15h 53m
1 stop
Multiple Airlines Logo
11:00 - 10:15
DCA
-
CWL
18h 15m
1 stop
£672Multiple Airlines
Mon, 25 May - Wed, 9 Sep
Multiple Airlines Logo
11:35 - 22:28
CWL
-
DCA
15h 53m
1 stop
Multiple Airlines Logo
06:00 - 10:15
DCA
-
CWL
23h 15m
2 stops
£690Multiple Airlines
Mon, 25 May - Wed, 9 Sep
Multiple Airlines Logo
11:35 - 12:01
CWL
-
DCA
29h 26m
2 stops
Multiple Airlines Logo
06:00 - 10:15
DCA
-
CWL
23h 15m
2 stops
£700Multiple Airlines
Mon, 25 May - Wed, 9 Sep
Multiple Airlines Logo
11:35 - 18:13
CWL
-
DCA
11h 38m
1 stop
Multiple Airlines Logo
18:55 - 10:15
DCA
-
CWL
10h 20m
1 stop
£703Multiple Airlines
Sat, 6 Jun - Fri, 12 Jun
Delta Logo
09:45 - 22:49
CWL
-
BWI
18h 04m
2 stops
Delta Logo
13:00 - 09:15
BWI
-
CWL
15h 15m
2 stops
£939Delta
Mon, 25 May - Wed, 9 Sep
WestJet Logo
11:35 - 10:47
CWL
-
BWI
28h 12m
2 stops
WestJet Logo
10:33 - 10:15
BWI
-
CWL
18h 42m
2 stops
£993WestJet
Sat, 6 Jun - Fri, 12 Jun
Delta Logo
09:50 - 23:17
CWL
-
BWI
18h 27m
2 stops
Delta Logo
18:10 - 16:45
BWI
-
CWL
17h 35m
2 stops
£1,212Delta
Sun, 24 May - Thu, 10 Sep
KLM Logo
09:50 - 20:46
CWL
-
BWI
15h 56m
2 stops
KLM Logo
13:00 - 09:15
BWI
-
CWL
15h 15m
2 stops
£1,259KLM
Sun, 24 May - Mon, 7 Sep

KLM flights from Cardiff to Washington, D.C.

Our best KLM deals on Cardiff to Washington, D.C. flight tickets
KLM
23 Jun
CWL09:45Cardiff Wales
10h 50m
1 stop
IAD15:35Washington, D.C. Dulles Intl
30 Jun
IAD17:40Washington, D.C. Dulles Intl
18h 05m
1 stop
CWL16:45Cardiff Wales
£918
KLM
24 May
CWL09:50Cardiff Wales
15h 56m
2 stops
BWI20:46Baltimore/Washington
7 Sept
BWI13:00Baltimore/Washington
15h 15m
2 stops
CWL09:15Cardiff Wales
£1,259
KLM
6 Jun
CWL09:45Cardiff Wales
14h 50m
2 stops
IAD19:35Washington, D.C. Dulles Intl
12 Jun
IAD12:29Washington, D.C. Dulles Intl
15h 46m
2 stops
CWL09:15Cardiff Wales
£4,401

WestJet flights from Cardiff to Washington, D.C.

Our best WestJet deals on Cardiff to Washington, D.C. flight tickets
WestJet
6 Jun
CWL11:35Cardiff Wales
28h 12m
2 stops
BWI10:47Baltimore/Washington
12 Jun
BWI10:33Baltimore/Washington
18h 42m
2 stops
CWL10:15Cardiff Wales
£993
WestJet
18 Jun
CWL11:35Cardiff Wales
35h 35m
2 stops
IAD18:10Washington, D.C. Dulles Intl
22 Jun
IAD19:00Washington, D.C. Dulles Intl
58h 15m
2 stops
CWL10:15Cardiff Wales
£1,168
WestJet
18 Jun
CWL11:35Cardiff Wales
35h 35m
2 stops
IAD18:10Washington, D.C. Dulles Intl
22 Jun
IAD19:00Washington, D.C. Dulles Intl
58h 15m
2 stops
CWL10:15Cardiff Wales
£1,264

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 12 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 - DCA

CWLDCA

Cardiff Wales

Sat 6/6

07:30-22:28

2 stops19h 58m

Washington, D.C. Reagan-National

Fri 12/6

18:55-10:15

1 stop10h 20m

£648

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Sat 6/6

07:30-21:55

3 stops19h 25m

Washington, D.C. Reagan-National

Fri 12/6

18:55-10:15

1 stop10h 20m

£655

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Mon 25/5

11:35-22:28

1 stop15h 53m

Washington, D.C. Reagan-National

Wed 9/9

11:00-10:15

1 stop18h 15m

£672

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Mon 25/5

11:35-22:28

1 stop15h 53m

Washington, D.C. Reagan-National

Wed 9/9

06:00-10:15

2 stops23h 15m

£690

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Mon 25/5

11:35-12:01

2 stops29h 26m

Washington, D.C. Reagan-National

Wed 9/9

06:00-10:15

2 stops23h 15m

£700
Fastest return journey

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Sat 6/6

11:35-18:13

1 stop11h 38m

Washington, D.C. Reagan-National

Fri 12/6

18:55-10:15

1 stop10h 20m

£703

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Mon 25/5

09:45-22:49

2 stops18h 04m

Baltimore/Washington

Wed 9/9

13:00-09:15

2 stops15h 15m

£939

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Sat 6/6

11:35-10:47

2 stops28h 12m

Baltimore/Washington

Fri 12/6

10:33-10:15

2 stops18h 42m

£993

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Sun 24/5

09:50-23:17

2 stops18h 27m

Baltimore/Washington

Thu 10/9

18:10-16:45

2 stops17h 35m

£1,212

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Sun 24/5

09:50-20:46

2 stops15h 56m

Baltimore/Washington

Mon 7/9

13:00-09:15

2 stops15h 15m

£1,259

Flights are sorted by cheapest return flights first.

Showing 1-10 of 16 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.?

WestJet and Delta 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

15h 53m

Direct flights

None
The fastest flight from Cardiff to Washington, D.C. takes 15h 53m
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.. 15h 53m 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
Lutherville Timonium
Cambridge
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.

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

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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