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Cheap flights from Washington to Cardiff from £246

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 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CWL
4 Aug — 11 Aug1
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 5 July 2026.

Sat 15/810:40
SEA
-
CWL
3 stops26h 40m
Multiple Airlines
Sat 22/811:35
CWL
-
SEA
3 stops30h 05m
Multiple Airlines
Deal found 1/7£730
Mon 10/810:40
SEA
-
CWL
3 stops28h 10m
Multiple Airlines
Mon 17/822:10
CWL
-
SEA
3 stops30h 57m
Multiple Airlines
Deal found 30/6£778
Sun 16/808:00
SEA
-
CWL
3 stops24h 45m
Multiple Airlines
Sun 23/817:15
CWL
-
SEA
3 stops35h 52m
Multiple Airlines
Deal found 2/7£796
Mon 10/817:45
SEA
-
CWL
1 stop15h 00m
Delta
Mon 17/809:45
CWL
-
SEA
1 stop33h 52m
Delta
Deal found 3/7£837

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 5 July 2026.

Round-trip from

£730

One-way from

£246
WestJet
  • WestJet
  • 15/8-22/8
  • 6 total stops
  • 56h 45m total
  • Washington to Cardiff
Search Deals
12/8
  • 12/8
  • 3 total stops
  • 31h 25m 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 5 July 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
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 15/8

19:10-21:20

1 stop18h 10m

Cardiff Wales

Sat 22/8

07:30-17:10

1 stop17h 40m

£751

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 10/8

10:40-22:50

3 stops28h 10m

Cardiff Wales

Mon 17/8

22:10-21:07

3 stops30h 57m

£778

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 10/8

17:45-16:45

1 stop15h 00m

Cardiff Wales

Mon 17/8

09:45-11:37

1 stop33h 52m

£837

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 10/8

13:50-16:45

1 stop18h 55m

Cardiff Wales

Mon 17/8

17:15-11:37

1 stop26h 22m

£837
Cheapest one-way

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 12/8

07:00-22:25

3 stops31h 25m

£246
Fastest single journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 13/8

19:10-06:55

1 stop27h 45m

£269

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 11/8

19:00-22:25

3 stops43h 25m

£280

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 17/8

21:40-22:50

2 stops41h 10m

£323

Flights are sorted by cheapest return flights first.

Deals found on 1/7

Sorted by cheapest first

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. Delta provides one of the quickest options available for as low as £837. There are 4709 mi between State of Washington and Cardiff.

  • 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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How does Cheapflights help users find flights from Washington to Cardiff?

When you search for this flight from Washington to Cardiff, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from 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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