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Cheap flights from Washington to Cardiff from £815

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Cardiff departing on 5/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Washington to Cardiff

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
19:10 - 21:20SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 10m1 stop Dublin
Multiple Airlines Logo
11:35 - 09:40CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
30h 05m2 stops Toronto Pearson Intl Calgary
£815Multiple Airlines
Sat, 5 Sep - Sat, 12 Sep
Delta Logo
12:36 - 16:45SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
20h 09m2 stops Los Angeles Amsterdam Schiphol
Delta Logo
09:45 - 16:35CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 50m1 stop Amsterdam Schiphol
£888Delta
Tue, 1 Sep - Tue, 8 Sep
Delta Logo
07:15 - 09:15SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 00m2 stops Chicago O'Hare Intl Amsterdam Schiphol
Delta Logo
09:45 - 16:35CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 50m1 stop Amsterdam Schiphol
£888Delta
Tue, 1 Sep - Tue, 8 Sep
Delta Logo
07:15 - 09:15SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 00m2 stops Chicago O'Hare Intl Amsterdam Schiphol
Delta Logo
09:45 - 21:15CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
19h 30m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
£895Delta
Tue, 1 Sep - Tue, 8 Sep
Delta Logo
07:15 - 09:15SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 00m2 stops Chicago O'Hare Intl Amsterdam Schiphol
Delta Logo
09:45 - 23:55CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
22h 10m2 stops Amsterdam Schiphol Minneapolis St Paul
£896Delta
Tue, 1 Sep - Tue, 8 Sep
Delta Logo
07:15 - 09:15SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 00m2 stops Chicago O'Hare Intl Amsterdam Schiphol
Delta Logo
09:45 - 22:03CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
20h 18m2 stops Amsterdam Schiphol Boston Logan Intl
£903Delta
Sat, 5 Sep - Sat, 12 Sep
Delta Logo
07:15 - 09:15SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 00m2 stops Chicago O'Hare Intl Amsterdam Schiphol
Delta Logo
09:45 - 16:35CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 50m1 stop Amsterdam Schiphol
£956Delta
Sat, 5 Sep - Sat, 12 Sep
Delta Logo
13:50 - 16:45SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 55m1 stop Amsterdam Schiphol
Delta Logo
09:50 - 16:27CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 37m1 stop Amsterdam Schiphol
£959Delta
Sat, 22 Aug - Sat, 29 Aug
Delta Logo
07:15 - 09:15SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 00m2 stops Chicago O'Hare Intl Amsterdam Schiphol
Delta Logo
09:50 - 16:27CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 37m1 stop Amsterdam Schiphol
£962Delta
Sat, 22 Aug - Sat, 29 Aug
Delta Logo
07:15 - 09:15SEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 00m2 stops Chicago O'Hare Intl Amsterdam Schiphol
Delta Logo
09:50 - 22:20CWL  Cardiff Wales-SEA Seattle/Tacoma Intl
20h 30m2 stops Amsterdam Schiphol Boston Logan Intl
£969Delta
Sat, 22 Aug - Sat, 29 Aug

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Delta flights from State of Washington to Cardiff

Our best Delta deals on State of Washington to Cardiff flight tickets
Delta
1 Sept
SEA12:36Seattle/Tacoma Intl
20h 09m
2 stops
CWL16:45Cardiff Wales
8 Sept
CWL09:45Cardiff Wales
14h 50m
1 stop
SEA16:35Seattle/Tacoma Intl
£888
Delta
1 Sept
SEA07:15Seattle/Tacoma Intl
18h 00m
2 stops
CWL09:15Cardiff Wales
8 Sept
CWL09:45Cardiff Wales
14h 50m
1 stop
SEA16:35Seattle/Tacoma Intl
£888
Delta
1 Sept
SEA07:15Seattle/Tacoma Intl
18h 00m
2 stops
CWL09:15Cardiff Wales
8 Sept
CWL09:45Cardiff Wales
19h 30m
2 stops
SEA21:15Seattle/Tacoma Intl
£895

KLM flights from State of Washington to Cardiff

Our best KLM deals on State of Washington to Cardiff flight tickets
KLM
1 Sept
SEA13:50Seattle/Tacoma Intl
18h 55m
1 stop
CWL16:45Cardiff Wales
8 Sept
CWL09:45Cardiff Wales
14h 50m
1 stop
SEA16:35Seattle/Tacoma Intl
£979
KLM
1 Sept
SEA13:50Seattle/Tacoma Intl
18h 55m
1 stop
CWL16:45Cardiff Wales
8 Sept
CWL09:45Cardiff Wales
14h 50m
1 stop
SEA16:35Seattle/Tacoma Intl
£1,071
KLM
5 Sept
SEA13:50Seattle/Tacoma Intl
18h 55m
1 stop
CWL16:45Cardiff Wales
12 Sept
CWL09:45Cardiff Wales
14h 50m
1 stop
SEA16:35Seattle/Tacoma Intl
£1,276

momondo Fare Finder

 
Customise your flight search to find flights from State of 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, momondo users made 279,928 searches. Data last updated 11 August 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 Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 5/9

19:10-21:20

1 stop18h 10m

Cardiff Wales

Sat 12/9

11:35-09:40

2 stops30h 05m

£815

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Tue 1/9

12:36-16:45

2 stops20h 09m

Cardiff Wales

Tue 8/9

09:45-16:35

1 stop14h 50m

£888

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Tue 1/9

07:15-09:15

2 stops18h 00m

Cardiff Wales

Tue 8/9

09:45-16:35

1 stop14h 50m

£888

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Tue 1/9

07:15-09:15

2 stops18h 00m

Cardiff Wales

Tue 8/9

09:45-21:15

2 stops19h 30m

£895

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Tue 1/9

07:15-09:15

2 stops18h 00m

Cardiff Wales

Tue 8/9

09:45-23:55

2 stops22h 10m

£896

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 5/9

07:15-09:15

2 stops18h 00m

Cardiff Wales

Sat 12/9

09:45-22:03

2 stops20h 18m

£903

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 5/9

07:15-09:15

2 stops18h 00m

Cardiff Wales

Sat 12/9

09:45-16:35

1 stop14h 50m

£956

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 22/8

13:50-16:45

1 stop18h 55m

Cardiff Wales

Sat 29/8

09:50-16:27

1 stop14h 37m

£959
Fastest return journey

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 22/8

07:15-09:15

2 stops18h 00m

Cardiff Wales

Sat 29/8

09:50-16:27

1 stop14h 37m

£962

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 22/8

07:15-09:15

2 stops18h 00m

Cardiff Wales

Sat 29/8

09:50-22:20

2 stops20h 30m

£969

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

Cheap State of Washington to Cardiff flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Cardiff

Fastest flight time

18h 10m

Direct flights

None
The fastest flight from State of Washington to Cardiff takes 18h 10m
There are no direct flights from State of Washington to Cardiff. There are no popular flight routes from State of Washington to Cardiff.
Search flight deals

Frequently asked questions about flying from Washington to Cardiff

  • When did momondo last update prices for flights from Washington to Cardiff Wales Airport?

    Prices for flights from Washington to Cardiff Wales Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Washington to Cardiff Wales Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington to Cardiff Wales Airport.

  • What documentation or ID do you need to fly to Cardiff Wales Airport?

    The necessary travel and health documents for your Cardiff Wales Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Frequently asked questions about flying from Washington to Cardiff

  • How do I get Price Alerts for flights from State of Washington to Cardiff?

    Search flight deals from State of Washington to Cardiff. While viewing offers you’ll have the option to create a Price Alert.

  • How can I save money on flights from State of Washington to Cardiff with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Travelling to a place near Cardiff?

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

Why use momondo?

Why should I use momondo to find a flight deal from Washington to Cardiff?

It is quick and easy to find Washington to Cardiff flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Cardiff that suits you.

Can I find flights from Washington to Cardiff with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Cardiff from Washington with this policy.

How can momondo help me find flights from Washington to Cardiff?

momondo helps you find the best flight between Washington and Cardiff by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Washington to Cardiff right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Cardiff, momondo offers a useful price alert feature which will track prices for flights to Cardiff from Washington and alert you when they change.

An easier way to manage your Cardiff trip

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Find better results for your trip to the United Kingdom

Airports servicing Wales

Holyhead Anglesey Airport