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Cheap flights from Washington to Cardiff from £180

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 15/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CWL
3 Apr — 10 Apr1
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 4 March 2026.

Tue 14/415:40
SEA
-
CWL
2 stops23h 45m
Multiple Airlines
Tue 21/423:15
CWL
-
SEA
2 stops26h 40m
Multiple Airlines
Deal found 28/2£553
Wed 1/419:10
SEA
-
CWL
1 stop19h 15m
Multiple Airlines
Sun 12/421:45
CWL
-
SEA
2 stops29h 40m
Multiple Airlines
Deal found 1/3£632
Tue 14/413:45
SEA
-
CWL
1 stop19h 00m
KLM
Tue 21/409:45
CWL
-
SEA
1 stop14h 45m
KLM
Deal found 28/2£676
Wed 1/408:25
SEA
-
CWL
2 stops16h 50m
Multiple Airlines
Fri 10/409:45
CWL
-
SEA
1 stop14h 45m
Multiple Airlines
Deal found 28/2£682
Wed 1/413:32
SEA
-
CWL
2 stops19h 13m
Delta
Fri 10/409:45
CWL
-
SEA
1 stop14h 45m
Delta
Deal found 1/3£683
Sun 12/417:35
SEA
-
CWL
1 stop31h 40m
KLM
Sun 19/409:50
CWL
-
SEA
1 stop33h 55m
KLM
Deal found 27/2£716
Wed 1/406:00
SEA
-
CWL
2 stops26h 45m
Delta
Sun 12/409:50
CWL
-
SEA
1 stop33h 55m
Delta
Deal found 28/2£719

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 4 March 2026.

Round-trip from

£553

One-way from

£180
14/4-21/4
  • 14/4-21/4
  • 4 total stops
  • 50h 25m total
  • Washington to Cardiff
Search Deals
15/4
  • 15/4
  • 3 total stops
  • 43h 20m 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 4 March 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

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 1/4

13:32-16:45

2 stops19h 13m

Cardiff Wales

Fri 10/4

09:45-16:30

1 stop14h 45m

£683

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 1/4

16:55-16:45

2 stops15h 50m

Cardiff Wales

Fri 10/4

09:45-22:10

2 stops20h 25m

£690

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 12/4

17:35-09:15

1 stop31h 40m

Cardiff Wales

Sun 19/4

09:50-11:45

1 stop33h 55m

£716

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 1/4

06:00-16:45

2 stops26h 45m

Cardiff Wales

Sun 12/4

09:50-11:45

1 stop33h 55m

£719

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 1/4

07:15-09:15

2 stops18h 00m

Cardiff Wales

Sat 11/4

09:45-10:03

2 stops32h 18m

£736

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 1/4

13:45-16:45

1 stop19h 00m

Cardiff Wales

Sun 12/4

09:50-11:45

1 stop33h 55m

£775

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 30/5

19:35-10:15

2 stops54h 40m

Cardiff Wales

Tue 30/6

11:35-09:40

2 stops30h 05m

£782

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 2/8

13:50-16:45

1 stop18h 55m

Cardiff Wales

Sun 9/8

17:15-11:37

1 stop26h 22m

£814

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 15/4

19:00-22:20

3 stops43h 20m

£180

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 23/5

19:35-10:15

3 stops30h 40m

£220

Flights are sorted by cheapest return flights first.

Deals found on 2/3

Showing 1-10 of 12 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 19h 13m. Delta provides one of the quickest options available for as low as £683. 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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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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