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Cheap flights from Seattle to Cardiff from £648

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Cardiff departing on 1/9. 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
1 adult, Economy, 0 bags

Find the cheapest flights from Seattle to Cardiff

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
15:40 - 23:25
SEA
-
CWL
23h 45m
2 stops
Multiple Airlines Logo
23:15 - 17:55
CWL
-
SEA
26h 40m
2 stops
£648Multiple Airlines
Tue, 1 Sep - Tue, 8 Sep
Multiple Airlines Logo
10:30 - 22:20
SEA
-
CWL
27h 50m
2 stops
Multiple Airlines Logo
23:50 - 21:04
CWL
-
SEA
29h 14m
3 stops
£693Multiple Airlines
Thu, 15 Oct - Wed, 21 Oct
Multiple Airlines Logo
05:40 - 22:20
SEA
-
CWL
32h 40m
3 stops
Multiple Airlines Logo
23:50 - 21:04
CWL
-
SEA
29h 14m
3 stops
£699Multiple Airlines
Thu, 15 Oct - Wed, 21 Oct
Multiple Airlines Logo
19:10 - 23:25
SEA
-
CWL
20h 15m
1 stop
Multiple Airlines Logo
11:35 - 18:45
CWL
-
SEA
39h 10m
2 stops
£784Multiple Airlines
Tue, 1 Sep - Tue, 8 Sep
Multiple Airlines Logo
19:10 - 23:25
SEA
-
CWL
20h 15m
1 stop
Multiple Airlines Logo
11:35 - 09:40
CWL
-
SEA
30h 05m
2 stops
£806Multiple Airlines
Tue, 1 Sep - Mon, 7 Sep
Multiple Airlines Logo
19:10 - 22:20
SEA
-
CWL
19h 10m
1 stop
Multiple Airlines Logo
23:50 - 19:00
CWL
-
SEA
27h 10m
2 stops
£842Multiple Airlines
Thu, 15 Oct - Wed, 21 Oct
Multiple Airlines Logo
19:10 - 21:20
SEA
-
CWL
18h 10m
1 stop
Multiple Airlines Logo
11:35 - 09:40
CWL
-
SEA
30h 05m
2 stops
£844Multiple Airlines
Sat, 22 Aug - Sat, 29 Aug
Delta Logo
13:50 - 16:45
SEA
-
CWL
18h 55m
1 stop
Delta Logo
09:45 - 16:35
CWL
-
SEA
14h 50m
1 stop
£854Delta
Tue, 1 Sep - Tue, 8 Sep
Virgin Atlantic Logo
13:45 - 16:45
SEA
-
CWL
19h 00m
1 stop
Virgin Atlantic Logo
17:15 - 11:52
CWL
-
SEA
26h 37m
1 stop
£858Virgin Atlantic
Thu, 15 Oct - Wed, 21 Oct
Delta Logo
09:45 - 16:45
SEA
-
CWL
23h 00m
2 stops
Delta Logo
09:45 - 23:52
CWL
-
SEA
22h 07m
2 stops
£868Delta
Thu, 15 Oct - Wed, 21 Oct

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KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets
KLM
1 Sept
SEA17:45Seattle/Tacoma Intl
15h 00m
1 stop
CWL16:45Cardiff Wales
7 Sept
CWL09:45Cardiff Wales
14h 50m
1 stop
SEA16:35Seattle/Tacoma Intl
£891
KLM
21 Aug
SEA17:45Seattle/Tacoma Intl
15h 20m
1 stop
CWL17:05Cardiff Wales
30 Aug
CWL09:50Cardiff Wales
21h 30m
2 stops
SEA23:20Seattle/Tacoma Intl
£969
KLM
8 Aug
SEA13:50Seattle/Tacoma Intl
18h 55m
1 stop
CWL16:45Cardiff Wales
16 Aug
CWL09:50Cardiff Wales
14h 37m
1 stop
SEA16:27Seattle/Tacoma Intl
£1,046

Delta flights from Seattle to Cardiff

Our best Delta deals on Seattle to Cardiff flight tickets
Delta
1 Sept
SEA13:50Seattle/Tacoma Intl
18h 55m
1 stop
CWL16:45Cardiff Wales
8 Sept
CWL09:45Cardiff Wales
14h 50m
1 stop
SEA16:35Seattle/Tacoma Intl
£854
Delta
15 Oct
SEA09:45Seattle/Tacoma Intl
23h 00m
2 stops
CWL16:45Cardiff Wales
21 Oct
CWL09:45Cardiff Wales
22h 07m
2 stops
SEA23:52Seattle/Tacoma Intl
£868
Delta
10 Aug
SEA17:45Seattle/Tacoma Intl
15h 00m
1 stop
CWL16:45Cardiff Wales
17 Aug
CWL09:45Cardiff Wales
33h 52m
1 stop
SEA11:37Seattle/Tacoma Intl
£901

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 3 August 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 1/9

15:40-23:25

2 stops23h 45m

Cardiff Wales

Tue 8/9

23:15-17:55

2 stops26h 40m

£648

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 15/10

10:30-22:20

2 stops27h 50m

Cardiff Wales

Wed 21/10

23:50-21:04

3 stops29h 14m

£693

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 15/10

05:40-22:20

3 stops32h 40m

Cardiff Wales

Wed 21/10

23:50-21:04

3 stops29h 14m

£699

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 1/9

19:10-23:25

1 stop20h 15m

Cardiff Wales

Tue 8/9

11:35-18:45

2 stops39h 10m

£784

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 1/9

19:10-23:25

1 stop20h 15m

Cardiff Wales

Mon 7/9

11:35-09:40

2 stops30h 05m

£806

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 15/10

19:10-22:20

1 stop19h 10m

Cardiff Wales

Wed 21/10

23:50-19:00

2 stops27h 10m

£842

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 22/8

19:10-21:20

1 stop18h 10m

Cardiff Wales

Sat 29/8

11:35-09:40

2 stops30h 05m

£844
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 1/9

13:50-16:45

1 stop18h 55m

Cardiff Wales

Tue 8/9

09:45-16:35

1 stop14h 50m

£854

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 15/10

13:45-16:45

1 stop19h 00m

Cardiff Wales

Wed 21/10

17:15-11:52

1 stop26h 37m

£858

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 15/10

09:45-16:45

2 stops23h 00m

Cardiff Wales

Wed 21/10

09:45-23:52

2 stops22h 07m

£868

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

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 10m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 18h 10m
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 10m 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.

Frequently asked questions about flying from Seattle to Cardiff

  • How do I get Price Alerts for flights from Seattle to Cardiff?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to Seattle from Cardiff. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from Seattle to Cardiff with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

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