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Cheap flights from Cardiff to Washington, D.C. from £708

This is the cheapest return 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 3/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
23:30 - 20:29
CWL
-
IAD
25h 59m
3 stops
Multiple Airlines Logo
08:18 - 10:15
IAD
-
CWL
20h 57m
2 stops
£708Multiple Airlines
Wed, 3 Jun - Wed, 10 Jun
Multiple Airlines Logo
23:30 - 20:35
CWL
-
IAD
26h 05m
2 stops
Multiple Airlines Logo
08:18 - 10:15
IAD
-
CWL
20h 57m
2 stops
£716Multiple Airlines
Wed, 3 Jun - Wed, 10 Jun
Multiple Airlines Logo
23:30 - 20:29
CWL
-
IAD
25h 59m
3 stops
Multiple Airlines Logo
08:18 - 22:25
IAD
-
CWL
33h 07m
3 stops
£728Multiple Airlines
Wed, 3 Jun - Wed, 10 Jun
Multiple Airlines Logo
23:30 - 20:35
CWL
-
IAD
26h 05m
2 stops
Multiple Airlines Logo
09:55 - 10:15
IAD
-
CWL
19h 20m
1 stop
£769Multiple Airlines
Wed, 3 Jun - Wed, 10 Jun
Multiple Airlines Logo
21:45 - 19:00
CWL
-
IAD
26h 15m
2 stops
Multiple Airlines Logo
16:00 - 23:05
IAD
-
CWL
26h 05m
2 stops
£801Multiple Airlines
Tue, 23 Jun - Tue, 30 Jun
Multiple Airlines Logo
21:45 - 19:00
CWL
-
IAD
26h 15m
2 stops
Multiple Airlines Logo
08:18 - 23:05
IAD
-
CWL
33h 47m
3 stops
£807Multiple Airlines
Tue, 23 Jun - Tue, 30 Jun
Multiple Airlines Logo
21:45 - 19:00
CWL
-
IAD
26h 15m
2 stops
Multiple Airlines Logo
21:10 - 23:05
IAD
-
CWL
20h 55m
1 stop
£847Multiple Airlines
Tue, 23 Jun - Tue, 30 Jun
Multiple Airlines Logo
11:35 - 15:01
CWL
-
IAD
32h 26m
3 stops
Multiple Airlines Logo
08:18 - 23:05
IAD
-
CWL
33h 47m
3 stops
£883Multiple Airlines
Tue, 23 Jun - Tue, 30 Jun
Multiple Airlines Logo
07:30 - 15:45
CWL
-
IAD
13h 15m
1 stop
Multiple Airlines Logo
10:16 - 10:15
IAD
-
CWL
18h 59m
2 stops
£887Multiple Airlines
Sat, 6 Jun - Fri, 12 Jun
KLM Logo
09:45 - 15:35
CWL
-
IAD
10h 50m
1 stop
KLM Logo
18:10 - 09:15
IAD
-
CWL
10h 05m
1 stop
£908KLM
Wed, 3 Jun - Wed, 10 Jun

KLM flights from Cardiff to Washington, D.C. Dulles Intl Airport

Our best KLM deals on Cardiff to Washington, D.C. Dulles Intl Airport flight tickets
KLM
3 Jun
CWL09:45Cardiff Wales
10h 50m
1 stop
IAD15:35Washington, D.C. Dulles Intl
10 Jun
IAD18:10Washington, D.C. Dulles Intl
10h 05m
1 stop
CWL09:15Cardiff Wales
£908
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
£912
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
£4,372

WestJet flights from Cardiff to Washington, D.C. Dulles Intl Airport

Our best WestJet deals on Cardiff to Washington, D.C. Dulles Intl Airport flight tickets
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
£1,139
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
£1,160
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
£1,173

momondo Fare Finder

 
Customise your flight search to find flights from Cardiff to Washington, D.C. Dulles Intl Airport 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 May 2026.
Use the filters below to find and compare flights from Cardiff to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 3/6

23:30-20:29

3 stops25h 59m

Washington, D.C. Dulles Intl

Wed 10/6

08:18-10:15

2 stops20h 57m

£708

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 3/6

23:30-20:35

2 stops26h 05m

Washington, D.C. Dulles Intl

Wed 10/6

08:18-10:15

2 stops20h 57m

£716

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 3/6

23:30-20:29

3 stops25h 59m

Washington, D.C. Dulles Intl

Wed 10/6

08:18-22:25

3 stops33h 07m

£728

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 3/6

23:30-20:35

2 stops26h 05m

Washington, D.C. Dulles Intl

Wed 10/6

09:55-10:15

1 stop19h 20m

£769

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 23/6

21:45-19:00

2 stops26h 15m

Washington, D.C. Dulles Intl

Tue 30/6

16:00-23:05

2 stops26h 05m

£801

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 23/6

21:45-19:00

2 stops26h 15m

Washington, D.C. Dulles Intl

Tue 30/6

08:18-23:05

3 stops33h 47m

£807

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 23/6

21:45-19:00

2 stops26h 15m

Washington, D.C. Dulles Intl

Tue 30/6

21:10-23:05

1 stop20h 55m

£847

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 23/6

11:35-15:01

3 stops32h 26m

Washington, D.C. Dulles Intl

Tue 30/6

08:18-23:05

3 stops33h 47m

£883

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 6/6

07:30-15:45

1 stop13h 15m

Washington, D.C. Dulles Intl

Fri 12/6

10:16-10:15

2 stops18h 59m

£887
Fastest return journey

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 3/6

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Wed 10/6

18:10-09:15

1 stop10h 05m

£908

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

When to book flights from Cardiff to Washington, D.C. Dulles Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Cardiff to Washington, D.C. Dulles Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Cardiff to Washington, D.C. Dulles Intl Airport (CWL to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Cardiff to Washington, D.C. Dulles Intl Airport

Fastest flight time

35h 35m

Direct flights

None
The fastest flight from Cardiff to Washington, D.C. Dulles Intl Airport takes 35h 35m
There are no direct flights from Cardiff to Washington, D.C. Dulles Intl Airport. There are no popular flight routes from Cardiff to Washington, D.C. Dulles Intl Airport.
Search flight deals

Frequently asked questions about flying from Cardiff to Washington, D.C. Dulles Intl Airport

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

    Cardiff Wales and Washington, D.C. Dulles Intl are 3552.6 mi apart from one another. A reasonable flight in good conditions will take 35h 35m.

  • When did momondo last update prices for flights from Cardiff Wales Airport to Washington, D.C. Dulles Intl Airport?

    Prices for flights from Cardiff Wales Airport to Washington, D.C. Dulles Intl Airport were last updated today.

  • How old do you have to be to fly from Cardiff Wales Airport to Washington, D.C. Dulles Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Cardiff Wales Airport to Washington, D.C. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The required travel and health documents for your Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Frequently asked questions about flying from Cardiff to Washington, D.C. Dulles Intl Airport

  • How do I get Price Alerts for flights from Cardiff to Washington, D.C. Dulles Intl Airport?

    Price Alerts will notify you by email when the price for flights to Washington, D.C. Dulles Intl Airport from Cardiff decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

  • How can I save money on flights from Cardiff to Washington, D.C. Dulles Intl Airport with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

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
Fairfax
Springfield
Arlington
Gettysburg
Linthicum Heights
Front Royal
Glen Burnie
Winchester
Laurel
Ellicott City
Lutherville Timonium
Cambridge
Westminster
Lexington Park
Leesburg
Ashburn
Sterling
Woodbridge

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. All flights to Washington, D.C. from Cardiff on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Cardiff to Washington, D.C.?

Once all potential Cardiff to Washington, D.C. flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Cardiff to Washington, D.C. right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Cardiff to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

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

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