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Cheap flights from Washington to Cardiff from £668

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 31/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CWL
17 Oct — 24 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Washington to Cardiff

Keep the following information in mind while searching for Washington to Cardiff flight deals. Data was last updated 17 September 2025.

Round-trip from

£668

Popular in

June

Cheapest in

January

Average price

£904
Delta
  • Delta
  • 31/10-7/11
  • 4 total stops
  • 39h 08m total
  • Washington to Cardiff
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£142 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£33 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Washington to Cardiff

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 17 September 2025.

Fri 31/1007:25SEA - CWL
2 stops19h 25mDelta
Fri 7/1110:20CWL - SEA
2 stops19h 43mDelta
Deal found 16/9£668
Wed 1/1013:30SEA - CWL
2 stops19h 15mKLM
Sat 11/1017:35CWL - SEA
1 stop30h 30mKLM
Deal found 16/9£697
Wed 1/1017:40SEA - CWL
1 stop31h 35mMultiple Airlines
Sat 11/1009:45CWL - SEA
1 stop14h 20mMultiple Airlines
Deal found 16/9£725
Fri 31/1006:00SEA - CWL
2 stops20h 50mVirgin Atlantic
Fri 7/1117:15CWL - SEA
1 stop26h 30mVirgin Atlantic
Deal found 16/9£734
Wed 1/1009:40SEA - CWL
2 stops23h 05mDelta
Sat 11/1009:45CWL - SEA
2 stops20h 18mDelta
Deal found 16/9£741
Fri 31/1016:00SEA - CWL
1 stop17h 55mKLM
Fri 7/1117:15CWL - SEA
1 stop26h 30mKLM
Deal found 16/9£919
Fri 31/1015:35SEA - CWL
2 stops21h 05mMultiple Airlines
Fri 7/1119:45CWL - SEA
3 stops29h 15mMultiple Airlines
Deal found 16/9£1,105

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 17 September 2025.
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

Fri 31/10

07:25-09:50

2 stops19h 25m

Cardiff Wales

Fri 7/11

10:20-22:03

2 stops19h 43m

£668

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 1/10

13:30-16:45

2 stops19h 15m

Cardiff Wales

Sat 11/10

17:35-16:05

1 stop30h 30m

£697

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 1/10

17:40-09:15

1 stop31h 35m

Cardiff Wales

Sat 11/10

09:45-16:05

1 stop14h 20m

£725

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 31/10

06:00-09:50

2 stops20h 50m

Cardiff Wales

Fri 7/11

17:15-11:45

1 stop26h 30m

£734

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 1/10

09:40-16:45

2 stops23h 05m

Cardiff Wales

Sat 11/10

09:45-22:03

2 stops20h 18m

£741

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 31/10

16:00-16:55

1 stop17h 55m

Cardiff Wales

Fri 7/11

17:15-11:45

1 stop26h 30m

£919

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 31/10

15:35-19:40

2 stops21h 05m

Cardiff Wales

Fri 7/11

19:45-17:00

3 stops29h 15m

£1,105

Flights are sorted by cheapest return flights first.

Deals found on 16/9

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 15m. Delta provides one of the quickest options available for as low as £697. 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.

  • What is the cheapest month to book a flight from State of Washington to Cardiff?

    Currently, July is the cheapest month in which you can book a flight from State of Washington to Cardiff (average of £169). Flying from State of Washington to Cardiff in December is currently the most expensive (average of £263). 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 Cardiff?

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

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