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Cheap flights from Washington to Cardiff from £651

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 23/3. 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
0 bags
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Cheap return flights

Enter your travel dates to find the best prices.
Delta Logo
07:15 - 09:50
SEA
-
CWL
19h 35m
2 stops
Delta Logo
09:45 - 22:10
CWL
-
SEA
20h 25m
2 stops
£651Delta
Mon, 23 Mar - Mon, 30 Mar
KLM Logo
16:05 - 09:50
SEA
-
CWL
34h 45m
1 stop
KLM Logo
17:15 - 11:45
CWL
-
SEA
26h 30m
1 stop
£677KLM
Sun, 15 Mar - Tue, 31 Mar
Multiple Airlines Logo
16:05 - 09:50
SEA
-
CWL
34h 45m
1 stop
Multiple Airlines Logo
09:45 - 22:15
CWL
-
SEA
20h 30m
2 stops
£686Multiple Airlines
Sun, 15 Mar - Tue, 31 Mar
Delta Logo
07:15 - 09:50
SEA
-
CWL
19h 35m
2 stops
Delta Logo
09:45 - 22:15
CWL
-
SEA
20h 30m
2 stops
£688Delta
Sun, 15 Mar - Tue, 31 Mar
KLM Logo
16:05 - 09:50
SEA
-
CWL
34h 45m
1 stop
KLM Logo
17:15 - 11:45
CWL
-
SEA
26h 30m
1 stop
£750KLM
Mon, 23 Mar - Mon, 30 Mar
Delta Logo
16:05 - 16:55
SEA
-
CWL
17h 50m
1 stop
Delta Logo
09:45 - 22:10
CWL
-
SEA
20h 25m
2 stops
£794Delta
Mon, 23 Mar - Mon, 30 Mar
Multiple Airlines Logo
17:35 - 16:45
SEA
-
CWL
15h 10m
1 stop
Multiple Airlines Logo
09:45 - 22:05
CWL
-
SEA
20h 20m
2 stops
£801Multiple Airlines
Tue, 23 Jun - Tue, 30 Jun
WestJet Logo
07:05 - 10:15
SEA
-
CWL
43h 10m
2 stops
WestJet Logo
11:35 - 13:08
CWL
-
SEA
33h 33m
2 stops
£809WestJet
Tue, 23 Jun - Tue, 30 Jun
WestJet Logo
07:05 - 10:15
SEA
-
CWL
43h 10m
2 stops
WestJet Logo
11:35 - 13:08
CWL
-
SEA
33h 33m
2 stops
£810WestJet
Tue, 23 Jun - Tue, 30 Jun
Multiple Airlines Logo
17:35 - 09:15
SEA
-
CWL
31h 40m
1 stop
Multiple Airlines Logo
09:50 - 16:27
CWL
-
SEA
14h 37m
1 stop
£821Multiple Airlines
Sat, 4 Jul - Sat, 1 Aug

Delta flights from State of Washington to Cardiff

Our best Delta deals on State of Washington to Cardiff flight tickets
Delta
23 Mar
SEA07:15Seattle/Tacoma Intl
19h 35m
2 stops
CWL09:50Cardiff Wales
30 Mar
CWL09:45Cardiff Wales
20h 25m
2 stops
SEA22:10Seattle/Tacoma Intl
£651
Delta
15 Mar
SEA07:15Seattle/Tacoma Intl
19h 35m
2 stops
CWL09:50Cardiff Wales
31 Mar
CWL09:45Cardiff Wales
20h 30m
2 stops
SEA22:15Seattle/Tacoma Intl
£688
Delta
23 Mar
SEA16:05Seattle/Tacoma Intl
17h 50m
1 stop
CWL16:55Cardiff Wales
30 Mar
CWL09:45Cardiff Wales
20h 25m
2 stops
SEA22:10Seattle/Tacoma Intl
£794

KLM flights from State of Washington to Cardiff

Our best KLM deals on State of Washington to Cardiff flight tickets
KLM
15 Mar
SEA16:05Seattle/Tacoma Intl
34h 45m
1 stop
CWL09:50Cardiff Wales
31 Mar
CWL17:15Cardiff Wales
26h 30m
1 stop
SEA11:45Seattle/Tacoma Intl
£677
KLM
23 Mar
SEA16:05Seattle/Tacoma Intl
34h 45m
1 stop
CWL09:50Cardiff Wales
30 Mar
CWL17:15Cardiff Wales
26h 30m
1 stop
SEA11:45Seattle/Tacoma Intl
£750
KLM
22 May
SEA07:15Seattle/Tacoma Intl
25h 50m
2 stops
CWL17:05Cardiff Wales
31 May
CWL17:15Cardiff Wales
37h 12m
2 stops
SEA22:27Seattle/Tacoma Intl
£2,716

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 7 February 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

Mon 23/3

07:15-09:50

2 stops19h 35m

Cardiff Wales

Mon 30/3

09:45-22:10

2 stops20h 25m

£651

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 15/3

16:05-09:50

1 stop34h 45m

Cardiff Wales

Tue 31/3

17:15-11:45

1 stop26h 30m

£677

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 15/3

16:05-09:50

1 stop34h 45m

Cardiff Wales

Tue 31/3

09:45-22:15

2 stops20h 30m

£686

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 15/3

07:15-09:50

2 stops19h 35m

Cardiff Wales

Tue 31/3

09:45-22:15

2 stops20h 30m

£688

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 23/3

16:05-09:50

1 stop34h 45m

Cardiff Wales

Mon 30/3

17:15-11:45

1 stop26h 30m

£750

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 23/3

16:05-16:55

1 stop17h 50m

Cardiff Wales

Mon 30/3

09:45-22:10

2 stops20h 25m

£794

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

17:35-16:45

1 stop15h 10m

Cardiff Wales

Tue 30/6

09:45-22:05

2 stops20h 20m

£801

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

07:05-10:15

2 stops43h 10m

Cardiff Wales

Tue 30/6

11:35-13:08

2 stops33h 33m

£809

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

07:05-10:15

2 stops43h 10m

Cardiff Wales

Tue 30/6

11:35-13:08

2 stops33h 33m

£810

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 4/7

17:35-09:15

1 stop31h 40m

Cardiff Wales

Sat 1/8

09:50-16:27

1 stop14h 37m

£821

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

15h 10m

Direct flights

None
The fastest flight from State of Washington to Cardiff takes 15h 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

  • 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.

  • 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