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Cheap flights from Washington to Cardiff from £255

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 30/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CWL
1 Jun — 8 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Washington to Cardiff

Enter your travel dates to find the best prices.

Cheapest flights from Washington to Cardiff
Explore the most affordable flight options available from Washington to Cardiff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 May 2026.

Mon 10/819:10
SEA
-
CWL
1 stop19h 40m
Multiple Airlines
Mon 17/822:10
CWL
-
SEA
2 stops28h 35m
Multiple Airlines
Deal found 30/4£733
Thu 13/819:35
SEA
-
CWL
2 stops30h 40m
Multiple Airlines
Mon 17/822:10
CWL
-
SEA
3 stops30h 50m
Multiple Airlines
Deal found 1/5£750
Thu 13/819:35
SEA
-
CWL
2 stops30h 40m
Multiple Airlines
Tue 18/823:15
CWL
-
SEA
3 stops29h 45m
Multiple Airlines
Deal found 1/5£753
Mon 10/813:50
SEA
-
CWL
1 stop18h 55m
Air France
Mon 17/817:15
CWL
-
SEA
1 stop31h 12m
Air France
Deal found 30/4£781
Thu 10/919:35
SEA
-
CWL
2 stops30h 40m
Multiple Airlines
Sat 10/1007:30
CWL
-
SEA
3 stops43h 15m
Multiple Airlines
Deal found 27/4£783
Thu 21/510:30
SEA
-
CWL
2 stops39h 45m
Multiple Airlines
Sat 6/611:35
CWL
-
SEA
1 stop15h 44m
Multiple Airlines
Deal found 30/4£789
Thu 13/817:45
SEA
-
CWL
1 stop15h 00m
KLM
Tue 18/809:45
CWL
-
SEA
1 stop33h 52m
KLM
Deal found 1/5£805

Find flight deals from Washington to Cardiff

Keep the following information in mind while searching for Washington to Cardiff flight deals. Data was last updated 2 May 2026.

Round-trip from

£733

One-way from

£255
10/8-17/8
  • 10/8-17/8
  • 3 total stops
  • 48h 15m total
  • Washington to Cardiff
Search Deals
WestJet
  • WestJet
  • 30/6
  • 2 total stops
  • 30h 40m total
  • Washington to Cardiff
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Washington to Cardiff 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 2 May 2026.
Use the filters below to find and compare flights from Washington to Cardiff that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 13/8

17:45-16:45

1 stop15h 00m

Cardiff Wales

Mon 17/8

09:45-11:37

1 stop33h 52m

£817

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 10/8

07:20-09:15

2 stops17h 55m

Cardiff Wales

Mon 17/8

09:45-20:41

2 stops18h 56m

£836

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 10/8

17:45-09:15

1 stop31h 30m

Cardiff Wales

Mon 17/8

09:45-11:37

1 stop33h 52m

£856

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 8/8

17:45-16:45

1 stop15h 00m

Cardiff Wales

Sun 16/8

09:50-16:27

1 stop14h 37m

£862

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 10/9

19:35-10:15

2 stops30h 40m

Cardiff Wales

Sat 10/10

07:30-21:04

2 stops21h 34m

£874

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 13/6

19:35-10:15

2 stops54h 40m

Cardiff Wales

Sat 20/6

11:35-09:40

2 stops54h 05m

£904
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 8/8

17:45-16:45

1 stop15h 00m

Cardiff Wales

Sun 16/8

09:50-16:27

1 stop14h 37m

£906

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 20/5

07:15-16:45

2 stops25h 30m

Cardiff Wales

Fri 5/6

09:45-16:24

1 stop14h 39m

£912

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 16/5

23:00-16:45

2 stops33h 45m

Cardiff Wales

Mon 8/6

09:45-19:50

2 stops42h 05m

£920

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 16/5

23:00-16:45

2 stops33h 45m

Cardiff Wales

Fri 5/6

09:45-22:01

2 stops20h 16m

£920

Flights are sorted by cheapest return flights first.

Deals found on 28/4

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

Best time to book a flight from Washington to Cardiff

Have a flexible travel schedule? Discover the best time to fly to Cardiff from Washington 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 Washington to Cardiff
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Washington to Cardiff. 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 into for flights to Cardiff from Washington?

    Cardiff Wales (CWL), located 9.1 mi from the city center, is the airport you fly into when you book flights from Washington to Cardiff.

  • How long is the flight from State of Washington to Cardiff?

    A quick flight from State of Washington to Cardiff can take about 15h. KLM provides one of the quickest options available for as low as £805. There are 4709 mi between State of Washington and Cardiff. This flight may include one or multiple stops.

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

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

  • How can I find direct flights from Washington to Cardiff?

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

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

    Yes. Cheapflights offers flight deals from Washington to Cardiff 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 Cardiff?

Book flights to Cardiff if you plan to visit one of these locations
Barry
Bridgend

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Alternative routes for Washington to Cardiff

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Washington to Cardiff, users can toggle the no change fees filter when performing a flight search.

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