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Cheap flights from Seattle to Cardiff from £431

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 22/5. 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
14:55 - 10:15
SEA
-
CWL
35h 20m
3 stops
Multiple Airlines Logo
23:15 - 09:40
CWL
-
SEA
42h 25m
3 stops
£615Multiple Airlines
Tue, 2 Jun - Tue, 23 Jun
Multiple Airlines Logo
19:20 - 10:15
SEA
-
CWL
30h 55m
2 stops
Multiple Airlines Logo
23:15 - 09:40
CWL
-
SEA
42h 25m
3 stops
£648Multiple Airlines
Tue, 2 Jun - Tue, 23 Jun
WestJet Logo
19:35 - 10:15
SEA
-
CWL
30h 40m
2 stops
WestJet Logo
11:35 - 09:40
CWL
-
SEA
30h 05m
2 stops
£717WestJet
Tue, 2 Jun - Tue, 23 Jun
Multiple Airlines Logo
19:10 - 22:25
SEA
-
CWL
19h 15m
1 stop
Multiple Airlines Logo
23:30 - 19:23
CWL
-
SEA
27h 53m
2 stops
£742Multiple Airlines
Wed, 22 Apr - Wed, 6 May
Multiple Airlines Logo
19:35 - 10:15
SEA
-
CWL
30h 40m
2 stops
Multiple Airlines Logo
11:35 - 21:07
CWL
-
SEA
17h 32m
1 stop
£753Multiple Airlines
Tue, 2 Jun - Tue, 23 Jun
Multiple Airlines Logo
19:10 - 22:25
SEA
-
CWL
19h 15m
1 stop
Multiple Airlines Logo
22:50 - 19:23
CWL
-
SEA
28h 33m
2 stops
£796Multiple Airlines
Wed, 22 Apr - Thu, 30 Apr
Multiple Airlines Logo
18:50 - 22:25
SEA
-
CWL
19h 35m
2 stops
Multiple Airlines Logo
23:30 - 21:08
CWL
-
SEA
29h 38m
2 stops
£821Multiple Airlines
Wed, 22 Apr - Wed, 6 May
Multiple Airlines Logo
18:50 - 22:25
SEA
-
CWL
19h 35m
2 stops
Multiple Airlines Logo
22:50 - 10:05
CWL
-
SEA
43h 15m
3 stops
£833Multiple Airlines
Wed, 22 Apr - Thu, 30 Apr
Multiple Airlines Logo
18:50 - 22:25
SEA
-
CWL
19h 35m
2 stops
Multiple Airlines Logo
23:30 - 09:40
CWL
-
SEA
42h 10m
3 stops
£852Multiple Airlines
Wed, 22 Apr - Wed, 6 May
Multiple Airlines Logo
18:50 - 22:25
SEA
-
CWL
19h 35m
2 stops
Multiple Airlines Logo
22:50 - 21:08
CWL
-
SEA
30h 18m
2 stops
£886Multiple Airlines
Wed, 22 Apr - Thu, 30 Apr

WestJet flights from Seattle to Cardiff

Our best WestJet deals on Seattle to Cardiff flight tickets
WestJet
2 Jun
SEA19:35Seattle/Tacoma Intl
30h 40m
2 stops
CWL10:15Cardiff Wales
23 Jun
CWL11:35Cardiff Wales
30h 05m
2 stops
SEA09:40Seattle/Tacoma Intl
£717
WestJet
30 May
SEA19:35Seattle/Tacoma Intl
54h 40m
2 stops
CWL10:15Cardiff Wales
30 Jun
CWL11:35Cardiff Wales
39h 10m
2 stops
SEA18:45Seattle/Tacoma Intl
£921
WestJet
30 May
SEA19:35Seattle/Tacoma Intl
30h 40m
2 stops
CWL10:15Cardiff Wales
30 Jun
CWL11:35Cardiff Wales
28h 00m
2 stops
SEA07:35Seattle/Tacoma Intl
£986

KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets
KLM
2 Jun
SEA17:45Seattle/Tacoma Intl
15h 00m
1 stop
CWL16:45Cardiff Wales
23 Jun
CWL17:15Cardiff Wales
26h 22m
1 stop
SEA11:37Seattle/Tacoma Intl
£1,001
KLM
30 May
SEA17:40Seattle/Tacoma Intl
15h 05m
1 stop
CWL16:45Cardiff Wales
30 Jun
CWL17:15Cardiff Wales
31h 05m
1 stop
SEA16:20Seattle/Tacoma Intl
£1,051
KLM
30 May
SEA17:40Seattle/Tacoma Intl
15h 05m
1 stop
CWL16:45Cardiff Wales
30 Jun
CWL17:15Cardiff Wales
31h 05m
1 stop
SEA16:20Seattle/Tacoma Intl
£1,052

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 4 April 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 2/6

14:55-10:15

3 stops35h 20m

Cardiff Wales

Tue 23/6

23:15-09:40

3 stops42h 25m

£615

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 2/6

19:20-10:15

2 stops30h 55m

Cardiff Wales

Tue 23/6

23:15-09:40

3 stops42h 25m

£648

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 2/6

19:35-10:15

2 stops30h 40m

Cardiff Wales

Tue 23/6

11:35-09:40

2 stops30h 05m

£717
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 22/4

19:10-22:25

1 stop19h 15m

Cardiff Wales

Wed 6/5

23:30-19:23

2 stops27h 53m

£742

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 2/6

19:35-10:15

2 stops30h 40m

Cardiff Wales

Tue 23/6

11:35-21:07

1 stop17h 32m

£753

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 22/4

19:10-22:25

1 stop19h 15m

Cardiff Wales

Thu 30/4

22:50-19:23

2 stops28h 33m

£796

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 22/4

18:50-22:25

2 stops19h 35m

Cardiff Wales

Wed 6/5

23:30-21:08

2 stops29h 38m

£821

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 22/4

18:50-22:25

2 stops19h 35m

Cardiff Wales

Thu 30/4

22:50-10:05

3 stops43h 15m

£833

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 22/4

18:50-22:25

2 stops19h 35m

Cardiff Wales

Wed 6/5

23:30-09:40

3 stops42h 10m

£852

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 22/4

18:50-22:25

2 stops19h 35m

Cardiff Wales

Thu 30/4

22:50-21:08

2 stops30h 18m

£886

Flights are sorted by cheapest return flights first.

Showing 1-10 of 11 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

19h 15m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 19h 15m
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 19h 15m 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