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Cheap flights from Seattle to Cardiff from £265

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Cardiff departing on 15/6. 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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Find the cheapest flights from Seattle to Cardiff

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
£708Multiple 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
£729Multiple 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
£736Multiple 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
£768Multiple 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
£772Multiple 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
£774Multiple 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
£777Multiple Airlines
Wed, 23 Sep - Wed, 7 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
£788Multiple 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
£801Virgin 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
£802Virgin Atlantic
Thu, 24 Sep - Thu, 8 Oct

WestJet flights from Seattle to Cardiff

Our best WestJet deals on Seattle 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
£904
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
£911
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
£915

KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets
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
£865
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
£866
KLM
25 Sept
SEA13:50Seattle/Tacoma Intl
19h 15m
1 stop
CWL17:05Cardiff Wales
8 Oct
CWL17:15Cardiff Wales
26h 37m
1 stop
SEA11:52Seattle/Tacoma Intl
£896

momondo Fare Finder

 
Customise your flight search to find flights from Seattle 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 13 May 2026.
Use the filters below to find and compare flights from Seattle 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

£708

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

£729

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

£736

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

£768

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

£772

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

£774

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 23/9

07:20-09:15

2 stops17h 55m

Cardiff Wales

Wed 7/10

09:45-22:04

2 stops20h 19m

£777
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

£788

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

£801

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

£802

Flights are sorted by cheapest return flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

See travel insights to Cardiff from

How to get the cheapest flight ticket from Seattle 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 Seattle/Tacoma Intl to Cardiff Wales?

WestJet is the most popular carrier operating from Seattle/Tacoma Intl to Cardiff Wales

When to book flights from Seattle to Cardiff

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Cardiff according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Seattle to Cardiff (SEA to CWL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Cardiff

Fastest flight time

17h 55m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 17h 55m
There are no direct flights from Seattle to Cardiff. There are no popular flight routes from Seattle to Cardiff.
Search flight deals

Frequently asked questions about flying from Seattle to Cardiff

  • How far is Seattle/Tacoma Intl to Cardiff Wales by plane?

    Seattle/Tacoma Intl and Cardiff Wales are 4700.6 mi apart from one another. Typically, this will take 17h 55m by plane in normal conditions.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport refresh daily.

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Cardiff Wales Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport 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 Seattle to Cardiff?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Cardiff from Seattle.

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

All flight searches from Seattle to Cardiff on momondo can be filtered to show those which offer flexible booking policies.

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

Once all potential Seattle to Cardiff flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of Seattle to Cardiff flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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