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Cheap flights from Cardiff to Washington, D.C. Dulles Intl Airport from £313

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — IAD
20 Aug — 27 Aug1
1 adult

Cheap 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 15 August 2025.

Round-trip from

£522

One-way from

£313
27/9-4/10
  • 27/9-4/10
  • 2 total stops
  • 24h 05m total
  • Cardiff to Washington, D.C.
Search Deals
4/10
  • 4/10
  • 3 total stops
  • 35h 20m total
  • Cardiff to Washington, D.C.
Search Deals

Find flight deals from Cardiff to Dulles Intl

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 15 August 2025.

Sat 27/909:00CWL - IAD
1 stop11h 50mMultiple Airlines
Sat 4/1017:20IAD - CWL
1 stop12h 15mMultiple Airlines
Deal found 13/8£522
Sat 27/909:45CWL - IAD
1 stop10h 50mVirgin Atlantic
Sat 4/1012:08IAD - CWL
2 stops16h 07mVirgin Atlantic
Deal found 13/8£639
Sat 27/909:45CWL - IAD
2 stops14h 52mDelta
Sat 4/1017:25IAD - CWL
2 stops18h 20mDelta
Deal found 13/8£643
Mon 18/813:10CWL - IAD
2 stops38h 00mMultiple Airlines
Mon 25/817:20IAD - CWL
1 stop17h 35mMultiple Airlines
Deal found 13/8£1,049
Mon 18/812:00CWL - IAD
2 stops34h 35mBritish Airways
Mon 25/817:55IAD - CWL
2 stops12h 35mBritish Airways
Deal found 13/8£1,325

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 15 August 2025.
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

Cardiff

Fly to

Dulles Intl

Route

Depart

Return

Price

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 27/9

09:00-15:50

1 stop11h 50m

Washington, D.C. Dulles Intl

Sat 4/10

17:20-10:35

1 stop12h 15m

£522

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 27/9

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Sat 4/10

12:08-09:15

2 stops16h 07m

£639

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 27/9

09:45-19:37

2 stops14h 52m

Washington, D.C. Dulles Intl

Sat 4/10

17:25-16:45

2 stops18h 20m

£643

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 4/10

09:00-15:20

3 stops35h 20m

£313

Flights are sorted by cheapest return flights first.

Deals found on 14/8

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.

Cheapflights Insights

Everything you need to know about your flight from Cardiff to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Cardiff to Washington, D.C. Dulles Intl Airport?

Currently, January is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of £599). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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.

  • What is the cheapest month to book a flight from Cardiff to Washington, D.C. Dulles Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of £599). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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
Woodbridge
Arlington
College Park
Laurel
Tysons

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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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