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Cheap flights from Cardiff to Washington, D.C. Dulles Intl Airport from £625

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — IAD
17 Sep — 24 Sep1
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 18 August 2026.

Tue 15/909:45 -
1 stop10h 50m
Mon 21/918:10 -
1 stop17h 35m
Deal found 15/8£625
Mon 28/909:45 -
1 stop10h 50m
Mon 5/1018:26 -
2 stops17h 19m
Deal found 14/8£640
Wed 30/909:45 -
2 stops18h 29m
Wed 7/1017:13 -
2 stops18h 32m
Deal found 16/8£646
Tue 15/923:15 -
3 stops26h 10m
Mon 21/920:30 -
2 stops21h 20m
Deal found 15/8£660
Wed 30/917:15 -
1 stop27h 20m
Wed 7/1012:29 -
2 stops15h 46m
Deal found 16/8£664
Mon 28/909:45 -
2 stops19h 56m
Mon 5/1011:10 -
2 stops17h 05m
Deal found 14/8£665
Mon 28/909:45 -
3 stops34h 25m
Mon 5/1020:30 -
2 stops21h 20m
Deal found 14/8£783
Wed 30/923:50 -
1 stop20h 55m
Wed 7/1017:15 -
1 stop24h 10m
Deal found 16/8£837

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 18 August 2026.

Round-trip from

£625
KLM
  • KLM
  • 15/9-21/9
  • 2 total stops
  • 28h 25m total
  • Cardiff to Washington, D.C.
Search Deals

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

CWLIAD

Cardiff Wales

Tue 15/9

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Mon 21/9

18:10-16:45

1 stop17h 35m

£625
Fastest return journey

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

£640

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Wed 30/9

09:45-23:14

2 stops18h 29m

Washington, D.C. Dulles Intl

Wed 7/10

17:13-16:45

2 stops18h 32m

£646

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Tue 15/9

23:15-20:25

3 stops26h 10m

Washington, D.C. Dulles Intl

Mon 21/9

20:30-22:50

2 stops21h 20m

£660

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Wed 30/9

17:15-15:35

1 stop27h 20m

Washington, D.C. Dulles Intl

Wed 7/10

12:29-09:15

2 stops15h 46m

£664

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

£665

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Mon 28/9

09:45-15:10

3 stops34h 25m

Washington, D.C. Dulles Intl

Mon 5/10

20:30-22:50

2 stops21h 20m

£783

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Wed 30/9

23:50-15:45

1 stop20h 55m

Washington, D.C. Dulles Intl

Wed 7/10

17:15-22:25

1 stop24h 10m

£837

Flights are sorted by cheapest return flights first.

Deals found on 15/8

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.

  • How long is the flight from Cardiff to Washington, D.C. Dulles Intl Airport?

    Airlines like KLM and Delta fly from Cardiff to Washington, D.C. Dulles Intl Airport in about 10h 50m. The time it takes to get you to your destination can typically vary by up to . There are 3548 mi between Cardiff and Washington, D.C. Dulles Intl Airport.

  • 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
Alexandria
Gaithersburg
Oxon Hill
Hanover
Woodbridge
Glen Burnie
Springfield
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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