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Cheap flights from Cardiff to Washington, D.C. from £305

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 9/5. 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
16:15 - 20:35
CWL
-
IAD
33h 20m
2 stops
Multiple Airlines Logo
20:30 - 23:25
IAD
-
CWL
21h 55m
3 stops
£686Multiple Airlines
Tue, 21 Apr - Tue, 28 Apr
Multiple Airlines Logo
21:45 - 23:54
CWL
-
BWI
31h 09m
3 stops
Multiple Airlines Logo
20:30 - 09:15
BWI
-
CWL
31h 45m
3 stops
£710Multiple Airlines
Sun, 19 Apr - Sun, 26 Apr
Multiple Airlines Logo
23:15 - 19:25
CWL
-
BWI
25h 10m
2 stops
Multiple Airlines Logo
20:30 - 23:25
BWI
-
CWL
21h 55m
3 stops
£716Multiple Airlines
Tue, 21 Apr - Tue, 28 Apr
Multiple Airlines Logo
11:00 - 21:25
CWL
-
IAD
39h 25m
3 stops
Multiple Airlines Logo
20:30 - 23:25
IAD
-
CWL
21h 55m
3 stops
£724Multiple Airlines
Tue, 21 Apr - Tue, 28 Apr
Multiple Airlines Logo
23:15 - 19:20
CWL
-
IAD
25h 05m
2 stops
Multiple Airlines Logo
21:05 - 23:25
IAD
-
CWL
21h 20m
1 stop
£734Multiple Airlines
Tue, 21 Apr - Tue, 28 Apr
KLM Logo
09:45 - 15:35
CWL
-
IAD
10h 50m
1 stop
KLM Logo
17:40 - 16:45
IAD
-
CWL
18h 05m
1 stop
£758KLM
Tue, 21 Apr - Tue, 28 Apr
KLM Logo
09:45 - 22:22
CWL
-
DCA
17h 37m
2 stops
KLM Logo
15:15 - 09:15
DCA
-
CWL
13h 00m
2 stops
£763KLM
Tue, 21 Apr - Tue, 28 Apr
Virgin Atlantic Logo
09:45 - 00:42
CWL
-
IAD
19h 57m
2 stops
Virgin Atlantic Logo
10:11 - 09:15
IAD
-
CWL
18h 04m
2 stops
£764Virgin Atlantic
Tue, 21 Apr - Tue, 28 Apr
Air France Logo
17:15 - 15:35
CWL
-
IAD
27h 20m
1 stop
Air France Logo
17:40 - 17:05
IAD
-
CWL
18h 25m
1 stop
£805Air France
Fri, 24 Apr - Fri, 1 May
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
£1,006British Airways
Sun, 19 Apr - Sun, 26 Apr

KLM flights from Cardiff to Washington, D.C.

Our best KLM deals on Cardiff to Washington, D.C. flight tickets
KLM
21 Apr
CWL09:45Cardiff Wales
10h 50m
1 stop
IAD15:35Washington, D.C. Dulles Intl
28 Apr
IAD17:40Washington, D.C. Dulles Intl
18h 05m
1 stop
CWL16:45Cardiff Wales
£758
KLM
21 Apr
CWL09:45Cardiff Wales
17h 37m
2 stops
DCA22:22Washington, D.C. Reagan-National
28 Apr
DCA15:15Washington, D.C. Reagan-National
13h 00m
2 stops
CWL09:15Cardiff Wales
£763

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 10 March 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

Tue 21/4

16:15-20:35

2 stops33h 20m

Washington, D.C. Dulles Intl

Tue 28/4

20:30-23:25

3 stops21h 55m

£686

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Sun 19/4

21:45-23:54

3 stops31h 09m

Baltimore/Washington

Sun 26/4

20:30-09:15

3 stops31h 45m

£710

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Tue 21/4

23:15-19:25

2 stops25h 10m

Baltimore/Washington

Tue 28/4

20:30-23:25

3 stops21h 55m

£716

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 21/4

11:00-21:25

3 stops39h 25m

Washington, D.C. Dulles Intl

Tue 28/4

20:30-23:25

3 stops21h 55m

£724

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 21/4

23:15-19:20

2 stops25h 05m

Washington, D.C. Dulles Intl

Tue 28/4

21:05-23:25

1 stop21h 20m

£734
Fastest return journey

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 21/4

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Tue 28/4

17:40-16:45

1 stop18h 05m

£758

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

Tue 21/4

09:45-22:22

2 stops17h 37m

Washington, D.C. Reagan-National

Tue 28/4

15:15-09:15

2 stops13h 00m

£763

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 21/4

09:45-00:42

2 stops19h 57m

Washington, D.C. Dulles Intl

Tue 28/4

10:11-09:15

2 stops18h 04m

£764

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Fri 24/4

17:15-15:35

1 stop27h 20m

Washington, D.C. Dulles Intl

Fri 1/5

17:40-17:05

1 stop18h 25m

£805

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

Sun 19/4

12:00-19:40

2 stops36h 40m

Baltimore/Washington

Sun 26/4

21:35-11:30

2 stops32h 55m

£1,006

Flights are sorted by cheapest return flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
1
2

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

17h 37m

Direct flights

None
The fastest flight from Cardiff to Washington, D.C. takes 17h 37m
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

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

    There are 3537.5 mi between Cardiff Wales and Washington, D.C.. 17h 37m 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.?

  • 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
Laurel
College Park
Arlington
Fairfax
Linthicum Heights
Alexandria
Glen Burnie
Lutherville Timonium
Ellicott City
Cambridge
Lexington Park
Westminster
Woodbridge
Bethesda
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