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Cheap flights from Seattle to Cardiff from £283

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 21/10. 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 - 22:25
SEA
-
CWL
19h 15m
1 stop
Multiple Airlines Logo
11:35 - 09:40
CWL
-
SEA
30h 05m
2 stops
£745Multiple Airlines
Wed, 26 Aug - Sat, 5 Sep
Multiple Airlines Logo
15:40 - 22:25
SEA
-
CWL
22h 45m
3 stops
Multiple Airlines Logo
07:30 - 21:00
CWL
-
SEA
45h 30m
3 stops
£745Multiple Airlines
Wed, 26 Aug - Sat, 5 Sep
Multiple Airlines Logo
05:45 - 10:15
SEA
-
CWL
20h 30m
2 stops
Multiple Airlines Logo
07:30 - 21:00
CWL
-
SEA
45h 30m
3 stops
£799Multiple Airlines
Wed, 26 Aug - Sat, 5 Sep
Multiple Airlines Logo
08:00 - 10:15
SEA
-
CWL
18h 15m
1 stop
Multiple Airlines Logo
07:30 - 21:00
CWL
-
SEA
45h 30m
3 stops
£821Multiple Airlines
Wed, 26 Aug - Sat, 5 Sep
Multiple Airlines Logo
19:10 - 22:25
SEA
-
CWL
19h 15m
1 stop
Multiple Airlines Logo
07:30 - 17:10
CWL
-
SEA
17h 40m
1 stop
£869Multiple Airlines
Wed, 26 Aug - Sat, 5 Sep
WestJet Logo
19:35 - 10:15
SEA
-
CWL
54h 40m
2 stops
WestJet Logo
11:35 - 21:00
CWL
-
SEA
41h 25m
2 stops
£906WestJet
Mon, 8 Jun - Mon, 15 Jun
KLM Logo
17:45 - 16:45
SEA
-
CWL
15h 00m
1 stop
KLM Logo
17:15 - 16:27
CWL
-
SEA
31h 12m
1 stop
£912KLM
Sat, 8 Aug - Sun, 16 Aug
KLM Logo
17:45 - 16:45
SEA
-
CWL
15h 00m
1 stop
KLM Logo
09:50 - 16:27
CWL
-
SEA
14h 37m
1 stop
£913KLM
Sat, 8 Aug - Sun, 16 Aug
Delta Logo
07:20 - 09:15
SEA
-
CWL
17h 55m
2 stops
Delta Logo
09:50 - 16:27
CWL
-
SEA
14h 37m
1 stop
£916Delta
Sat, 8 Aug - Sun, 16 Aug
Delta Logo
07:20 - 09:15
SEA
-
CWL
17h 55m
2 stops
Delta Logo
09:50 - 16:27
CWL
-
SEA
14h 37m
1 stop
£917Delta
Sat, 8 Aug - Sun, 16 Aug

KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets
KLM
27 Apr
SEA17:35Seattle/Tacoma Intl
15h 10m
1 stop
CWL16:45Cardiff Wales
4 May
CWL17:15Cardiff Wales
26h 27m
1 stop
SEA11:42Seattle/Tacoma Intl
£886
KLM
8 Aug
SEA17:45Seattle/Tacoma Intl
15h 00m
1 stop
CWL16:45Cardiff Wales
16 Aug
CWL17:15Cardiff Wales
31h 12m
1 stop
SEA16:27Seattle/Tacoma Intl
£912
KLM
8 Aug
SEA17:45Seattle/Tacoma Intl
15h 00m
1 stop
CWL16:45Cardiff Wales
16 Aug
CWL09:50Cardiff Wales
14h 37m
1 stop
SEA16:27Seattle/Tacoma Intl
£913

Delta flights from Seattle to Cardiff

Our best Delta deals on Seattle to Cardiff flight tickets
Delta
17 May
SEA17:40Seattle/Tacoma Intl
31h 35m
1 stop
CWL09:15Cardiff Wales
3 Jun
CWL09:45Cardiff Wales
14h 39m
1 stop
SEA16:24Seattle/Tacoma Intl
£914
Delta
8 Aug
SEA07:20Seattle/Tacoma Intl
17h 55m
2 stops
CWL09:15Cardiff Wales
16 Aug
CWL09:50Cardiff Wales
14h 37m
1 stop
SEA16:27Seattle/Tacoma Intl
£916
Delta
8 Aug
SEA07:20Seattle/Tacoma Intl
17h 55m
2 stops
CWL09:15Cardiff Wales
16 Aug
CWL09:50Cardiff Wales
14h 37m
1 stop
SEA16:27Seattle/Tacoma Intl
£917

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 24 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

Wed 26/8

19:10-22:25

1 stop19h 15m

Cardiff Wales

Sat 5/9

11:35-09:40

2 stops30h 05m

£745

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 26/8

15:40-22:25

3 stops22h 45m

Cardiff Wales

Sat 5/9

07:30-21:00

3 stops45h 30m

£745

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 26/8

05:45-10:15

2 stops20h 30m

Cardiff Wales

Sat 5/9

07:30-21:00

3 stops45h 30m

£799

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 26/8

08:00-10:15

1 stop18h 15m

Cardiff Wales

Sat 5/9

07:30-21:00

3 stops45h 30m

£821

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 26/8

19:10-22:25

1 stop19h 15m

Cardiff Wales

Sat 5/9

07:30-17:10

1 stop17h 40m

£869

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 8/6

19:35-10:15

2 stops54h 40m

Cardiff Wales

Mon 15/6

11:35-21:00

2 stops41h 25m

£906

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 8/8

17:45-16:45

1 stop15h 00m

Cardiff Wales

Sun 16/8

17:15-16:27

1 stop31h 12m

£912
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 8/8

17:45-16:45

1 stop15h 00m

Cardiff Wales

Sun 16/8

09:50-16:27

1 stop14h 37m

£913

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 8/8

07:20-09:15

2 stops17h 55m

Cardiff Wales

Sun 16/8

09:50-16:27

1 stop14h 37m

£916

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 8/8

07:20-09:15

2 stops17h 55m

Cardiff Wales

Sun 16/8

09:50-16:27

1 stop14h 37m

£917

Flights are sorted by cheapest return flights first.

Showing 1-10 of 15 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

18h 50m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 18h 50m
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 18h 50m 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