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Cheap flights from Washington to Cardiff from £203

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 14/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CWL
4 Mar — 11 Mar1
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 February 2026.

Tue 17/309:55
SEA
-
CWL
2 stops16h 55m
KLM
Tue 24/310:20
CWL
-
SEA
2 stops18h 55m
KLM
Deal found 31/1£563
Tue 17/316:05
SEA
-
CWL
1 stop34h 45m
Multiple Airlines
Tue 24/310:20
CWL
-
SEA
1 stop33h 15m
Multiple Airlines
Deal found 31/1£597
Sat 14/1107:20
SEA
-
CWL
2 stops18h 30m
Multiple Airlines
Mon 23/1110:20
CWL
-
SEA
1 stop33h 30m
Multiple Airlines
Deal found 1/2£646
Sat 14/1107:20
SEA
-
CWL
2 stops18h 30m
Delta
Mon 23/1110:20
CWL
-
SEA
2 stops19h 52m
Delta
Deal found 1/2£691
Tue 23/611:15
SEA
-
CWL
2 stops21h 30m
Delta
Tue 30/609:45
CWL
-
SEA
2 stops20h 20m
Delta
Deal found 30/1£776
Tue 23/607:05
SEA
-
CWL
2 stops43h 10m
WestJet
Tue 30/611:35
CWL
-
SEA
2 stops39h 03m
WestJet
Deal found 31/1£792
Mon 27/417:30
SEA
-
CWL
1 stop31h 45m
KLM
Fri 1/517:15
CWL
-
SEA
1 stop26h 27m
KLM
Deal found 31/1£860

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 February 2026.

Round-trip from

£563

One-way from

£203
KLM
  • KLM
  • 17/3-24/3
  • 4 total stops
  • 35h 50m total
  • Washington to Cardiff
Search Deals
14/4
  • 14/4
  • 3 total stops
  • 23h 45m 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 February 2026.
Use the filters below to find and compare flights from Washington to Cardiff that are best for you.

Fly from

Washington

Fly to

Cardiff

Route

Depart

Return

Price

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

09:55-09:50

2 stops16h 55m

Cardiff Wales

Tue 24/3

10:20-22:15

2 stops18h 55m

£563

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

16:05-09:50

1 stop34h 45m

Cardiff Wales

Tue 24/3

10:20-12:35

1 stop33h 15m

£597

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

11:15-16:45

2 stops21h 30m

Cardiff Wales

Tue 30/6

09:45-22:05

2 stops20h 20m

£776

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

07:05-10:15

2 stops43h 10m

Cardiff Wales

Tue 30/6

11:35-18:38

2 stops39h 03m

£792

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 27/4

17:30-09:15

1 stop31h 45m

Cardiff Wales

Fri 1/5

17:15-11:42

1 stop26h 27m

£860

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

13:50-16:45

1 stop18h 55m

Cardiff Wales

Tue 30/6

17:15-16:20

1 stop31h 05m

£889

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

07:20-09:15

2 stops17h 55m

Cardiff Wales

Tue 30/6

09:45-16:24

1 stop14h 39m

£891

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 14/4

15:40-23:25

3 stops23h 45m

£203

Flights are sorted by cheapest return flights first.

Deals found on 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 16h 55m. KLM provides one of the quickest options available for as low as £563. 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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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.

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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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