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

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/6. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — IAD
6 Jun — 13 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Cardiff to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest flights from Cardiff to Dulles Intl
Explore the most affordable flight options available from Cardiff to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 May 2026.

Mon 15/622:10
CWL
-
IAD
3 stops27h 19m
Multiple Airlines
Sat 20/608:18
IAD
-
CWL
3 stops32h 02m
Multiple Airlines
Deal found 4/5£708
Wed 3/623:30
CWL
-
IAD
3 stops25h 59m
Multiple Airlines
Wed 10/608:18
IAD
-
CWL
2 stops20h 57m
Multiple Airlines
Deal found 6/5£710
Wed 13/523:30
CWL
-
IAD
2 stops26h 05m
Multiple Airlines
Sat 13/622:11
IAD
-
CWL
2 stops31h 04m
Multiple Airlines
Deal found 4/5£863
Thu 18/616:55
CWL
-
IAD
2 stops31h 05m
Multiple Airlines
Thu 25/620:45
IAD
-
CWL
1 stop20h 35m
Multiple Airlines
Deal found 4/5£886
Wed 3/609:45
CWL
-
IAD
1 stop10h 50m
KLM
Wed 10/618:10
IAD
-
CWL
1 stop10h 05m
KLM
Deal found 6/5£911

Find flight deals from Cardiff to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Cardiff (CWL) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 7 May 2026.

Round-trip from

£708
15/6-20/6
  • 15/6-20/6
  • 6 total stops
  • 59h 21m total
  • Cardiff to Washington, D.C.
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Cheapflights Fare Finder

 
Customise your flight search to find flights from Cardiff to Dulles Intl 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, Cheapflights users made 858,174 searches. Data last updated 7 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

Mon 15/6

22:10-20:29

3 stops27h 19m

Washington, D.C. Dulles Intl

Sat 20/6

08:18-21:20

3 stops32h 02m

£708

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

£710
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

£911

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Thu 18/6

22:50-20:40

3 stops26h 50m

Washington, D.C. Dulles Intl

Thu 25/6

17:40-09:15

1 stop10h 35m

£1,073

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Thu 18/6

11:35-18:10

2 stops35h 35m

Washington, D.C. Dulles Intl

Mon 22/6

19:00-10:15

2 stops58h 15m

£1,142

Flights are sorted by cheapest return flights first.

Deals found on 4/5

Sorted by cheapest first

Best time to book a flight from Cardiff to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Cardiff with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Cardiff to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Cardiff to Washington, D.C. Dulles Intl?

    For a flight from Cardiff to Washington, D.C. Dulles Intl, you will be flying from Cardiff Wales. Cardiff Wales (CWL) is just 9.1 mi from the center of the city. Cardiff Wales is the only Cardiff airport and it handles 0 outbound flights to Washington, D.C. Dulles Intl per day. 0 airlines have flights to Washington, D.C. Dulles Intl from Cardiff Wales on a regular basis.

  • Can I find deals for flights from Cardiff to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Cardiff to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Cardiff to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Cardiff to Dulles Intl.

  • Can I find deals for business class flights from Cardiff to Dulles Intl?

    Yes. Cheapflights offers flight deals from Cardiff to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Travelling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Hanover
Oxon Hill
Gaithersburg
Woodbridge
Arlington
Alexandria
Sterling

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Can Cheapflights find flights from Cardiff to Dulles Intl with no change fees?

Need flexible booking options for your flight to Dulles Intl from Cardiff? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Cardiff to Dulles Intl become cheaper?

Not ready to book yet? You can track prices for flights from Cardiff to Dulles Intl on Cheapflights with our Price Alert feature and get notified when better prices are available.

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