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Cheap flights from Washington to Cardiff from £401

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Cardiff departing on 26/8. 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.
Multiple Airlines Logo
19:10 - 23:25
SEA
-
CWL
20h 15m
1 stop
Multiple Airlines Logo
22:50 - 18:45
CWL
-
SEA
27h 55m
2 stops
£705Multiple Airlines
Tue, 22 Sep - Thu, 8 Oct
Multiple Airlines Logo
19:10 - 23:25
SEA
-
CWL
20h 15m
1 stop
Multiple Airlines Logo
07:45 - 18:45
CWL
-
SEA
19h 00m
2 stops
£726Multiple Airlines
Tue, 22 Sep - Fri, 9 Oct
Multiple Airlines Logo
19:10 - 22:25
SEA
-
CWL
19h 15m
1 stop
Multiple Airlines Logo
07:45 - 18:45
CWL
-
SEA
19h 00m
2 stops
£732Multiple Airlines
Wed, 23 Sep - Fri, 9 Oct
Multiple Airlines Logo
19:10 - 21:20
SEA
-
CWL
18h 10m
1 stop
Multiple Airlines Logo
22:50 - 18:45
CWL
-
SEA
27h 55m
2 stops
£764Multiple Airlines
Sat, 26 Sep - Thu, 8 Oct
Multiple Airlines Logo
19:10 - 22:20
SEA
-
CWL
19h 10m
1 stop
Multiple Airlines Logo
07:45 - 18:45
CWL
-
SEA
19h 00m
2 stops
£768Multiple Airlines
Thu, 24 Sep - Fri, 9 Oct
Multiple Airlines Logo
07:20 - 09:15
SEA
-
CWL
17h 55m
2 stops
Multiple Airlines Logo
17:15 - 11:52
CWL
-
SEA
26h 37m
1 stop
£770Multiple Airlines
Wed, 23 Sep - Wed, 7 Oct
Multiple Airlines Logo
07:20 - 09:15
SEA
-
CWL
17h 55m
2 stops
Multiple Airlines Logo
09:45 - 22:04
CWL
-
SEA
20h 19m
2 stops
£774Multiple Airlines
Wed, 23 Sep - Fri, 9 Oct
Multiple Airlines Logo
19:10 - 21:20
SEA
-
CWL
18h 10m
1 stop
Multiple Airlines Logo
07:45 - 18:45
CWL
-
SEA
19h 00m
2 stops
£785Multiple Airlines
Sat, 26 Sep - Fri, 9 Oct
Virgin Atlantic Logo
07:20 - 09:15
SEA
-
CWL
17h 55m
2 stops
Virgin Atlantic Logo
17:15 - 11:52
CWL
-
SEA
26h 37m
1 stop
£797Virgin Atlantic
Thu, 24 Sep - Thu, 8 Oct
Virgin Atlantic Logo
13:50 - 16:45
SEA
-
CWL
18h 55m
1 stop
Virgin Atlantic Logo
17:15 - 11:52
CWL
-
SEA
26h 37m
1 stop
£798Virgin Atlantic
Thu, 24 Sep - Thu, 8 Oct

WestJet flights from State of Washington to Cardiff

Our best WestJet deals on State of Washington to Cardiff flight tickets
WestJet
2 Jun
SEA10:30Seattle/Tacoma Intl
39h 45m
2 stops
CWL10:15Cardiff Wales
6 Jun
CWL11:35Cardiff Wales
30h 05m
2 stops
SEA09:40Seattle/Tacoma Intl
£899
WestJet
2 Jun
SEA10:30Seattle/Tacoma Intl
39h 45m
2 stops
CWL10:15Cardiff Wales
6 Jun
CWL11:35Cardiff Wales
30h 05m
2 stops
SEA09:40Seattle/Tacoma Intl
£907
WestJet
30 May
SEA10:30Seattle/Tacoma Intl
39h 45m
2 stops
CWL10:15Cardiff Wales
30 Jun
CWL11:35Cardiff Wales
30h 05m
2 stops
SEA09:40Seattle/Tacoma Intl
£998

KLM flights from State of Washington to Cardiff

Our best KLM deals on State of Washington to Cardiff flight tickets
KLM
8 Aug
SEA13:50Seattle/Tacoma Intl
18h 55m
1 stop
CWL16:45Cardiff Wales
16 Aug
CWL17:15Cardiff Wales
26h 22m
1 stop
SEA11:37Seattle/Tacoma Intl
£860
KLM
8 Aug
SEA13:50Seattle/Tacoma Intl
18h 55m
1 stop
CWL16:45Cardiff Wales
16 Aug
CWL17:15Cardiff Wales
31h 12m
1 stop
SEA16:27Seattle/Tacoma Intl
£861
KLM
24 Sept
SEA17:40Seattle/Tacoma Intl
31h 35m
1 stop
CWL09:15Cardiff Wales
9 Oct
CWL09:45Cardiff Wales
14h 54m
1 stop
SEA16:39Seattle/Tacoma Intl
£862

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 12 May 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 - CWL

SEACWL

Seattle/Tacoma Intl

Tue 22/9

19:10-23:25

1 stop20h 15m

Cardiff Wales

Thu 8/10

22:50-18:45

2 stops27h 55m

£705

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 22/9

19:10-23:25

1 stop20h 15m

Cardiff Wales

Fri 9/10

07:45-18:45

2 stops19h 00m

£726

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 23/9

19:10-22:25

1 stop19h 15m

Cardiff Wales

Fri 9/10

07:45-18:45

2 stops19h 00m

£732

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 26/9

19:10-21:20

1 stop18h 10m

Cardiff Wales

Thu 8/10

22:50-18:45

2 stops27h 55m

£764

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 24/9

19:10-22:20

1 stop19h 10m

Cardiff Wales

Fri 9/10

07:45-18:45

2 stops19h 00m

£768

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 23/9

07:20-09:15

2 stops17h 55m

Cardiff Wales

Wed 7/10

17:15-11:52

1 stop26h 37m

£770

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 23/9

07:20-09:15

2 stops17h 55m

Cardiff Wales

Fri 9/10

09:45-22:04

2 stops20h 19m

£774
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 26/9

19:10-21:20

1 stop18h 10m

Cardiff Wales

Fri 9/10

07:45-18:45

2 stops19h 00m

£785

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 24/9

07:20-09:15

2 stops17h 55m

Cardiff Wales

Thu 8/10

17:15-11:52

1 stop26h 37m

£797

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 24/9

13:50-16:45

1 stop18h 55m

Cardiff Wales

Thu 8/10

17:15-11:52

1 stop26h 37m

£798

Flights are sorted by cheapest return flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

See travel insights to Cardiff from

How to get the cheapest flight ticket from State of Washington to Cardiff

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Washington to Cardiff Wales?

WestJet is the most popular carrier operating from Washington to Cardiff Wales

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

17h 55m

Direct flights

None
The fastest flight from State of Washington to Cardiff takes 17h 55m
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.

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

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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Find better results for your trip to the United Kingdom

Airports servicing Wales

Holyhead Anglesey Airport