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.

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.

£203 Cheap Flights from Seattle to Cardiff in 2026

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Find the cheapest flights from Seattle to Cardiff

Round-trip

One-way

Cheap return flights

Enter your travel dates to find the best prices.

16:05 - 16:55

SEA

CWL

17h 50m

1 stop

10:20 - 10:45

CWL

SEA

31h 25m

2 stops

£563KLM

Tue, 17 Mar - Tue, 24 Mar

16:05 - 09:50

SEA

CWL

34h 45m

1 stop

10:20 - 12:35

CWL

SEA

33h 15m

1 stop

£597Multiple Airlines

Tue, 17 Mar - Tue, 24 Mar

11:15 - 16:45

SEA

CWL

21h 30m

2 stops

09:45 - 22:05

CWL

SEA

20h 20m

2 stops

£776Delta

Tue, 23 Jun - Tue, 30 Jun

07:05 - 10:15

SEA

CWL

43h 10m

2 stops

11:35 - 18:38

CWL

SEA

39h 03m

2 stops

£792WestJet

Tue, 23 Jun - Tue, 30 Jun

07:05 - 10:15

SEA

CWL

43h 10m

2 stops

11:35 - 20:28

CWL

SEA

40h 53m

2 stops

£845WestJet

Tue, 23 Jun - Tue, 30 Jun

17:30 - 09:15

SEA

CWL

31h 45m

1 stop

17:15 - 11:42

CWL

SEA

26h 27m

1 stop

£860KLM

Mon, 27 Apr - Fri, 1 May

12:10 - 16:45

SEA

CWL

20h 35m

2 stops

17:15 - 11:42

CWL

SEA

26h 27m

1 stop

£863KLM

Mon, 27 Apr - Fri, 1 May

12:10 - 16:45

SEA

CWL

20h 35m

2 stops

09:45 - 21:50

CWL

SEA

20h 05m

2 stops

£870KLM

Mon, 27 Apr - Fri, 1 May

15:35 - 19:10

SEA

CWL

20h 35m

2 stops

17:25 - 19:20

CWL

SEA

32h 55m

3 stops

£879Multiple Airlines

Tue, 17 Mar - Tue, 24 Mar

13:50 - 16:45

SEA

CWL

18h 55m

1 stop

17:15 - 16:20

CWL

SEA

31h 05m

1 stop

£887Air France

Tue, 23 Jun - Tue, 30 Jun

KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets

KLM

17 Mar

SEA09:55Seattle/Tacoma Intl

16h 55m

2 stops

CWL09:50Cardiff Wales

24 Mar

CWL10:20Cardiff Wales

18h 55m

2 stops

SEA22:15Seattle/Tacoma Intl

£563

KLM

27 Apr

SEA17:30Seattle/Tacoma Intl

31h 45m

1 stop

CWL09:15Cardiff Wales

1 May

CWL17:15Cardiff Wales

26h 27m

1 stop

SEA11:42Seattle/Tacoma Intl

£860

KLM

27 Apr

SEA12:10Seattle/Tacoma Intl

20h 35m

2 stops

CWL16:45Cardiff Wales

1 May

CWL17:15Cardiff Wales

26h 27m

1 stop

SEA11:42Seattle/Tacoma Intl

£863

WestJet flights from Seattle to Cardiff

Our best WestJet deals on Seattle to Cardiff flight tickets

WestJet

23 Jun

SEA07:05Seattle/Tacoma Intl

43h 10m

2 stops

CWL10:15Cardiff Wales

30 Jun

CWL11:35Cardiff Wales

39h 03m

2 stops

SEA18:38Seattle/Tacoma Intl

£792

WestJet

23 Jun

SEA07:05Seattle/Tacoma Intl

43h 10m

2 stops

CWL10:15Cardiff Wales

30 Jun

CWL11:35Cardiff Wales

40h 53m

2 stops

SEA20:28Seattle/Tacoma Intl

£845

WestJet

1 Jul

SEA07:05Seattle/Tacoma Intl

19h 10m

2 stops

CWL10:15Cardiff Wales

4 Jul

CWL11:35Cardiff Wales

39h 03m

2 stops

SEA18:38Seattle/Tacoma Intl

£938

Fly from

Fly to

Route

Depart

Return

Price

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

16:05-16:55

1 stop17h 50m

Cardiff Wales

Tue 24/3

10:20-10:45

2 stops31h 25m

£563

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

16:05-09:50

1 stop34h 45m

Cardiff Wales

Tue 24/3

10:20-12:35

1 stop33h 15m

£597

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

11:15-16:45

2 stops21h 30m

Cardiff Wales

Tue 30/6

09:45-22:05

2 stops20h 20m

£776

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

07:05-10:15

2 stops43h 10m

Cardiff Wales

Tue 30/6

11:35-18:38

2 stops39h 03m

£792

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

07:05-10:15

2 stops43h 10m

Cardiff Wales

Tue 30/6

11:35-20:28

2 stops40h 53m

£845

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 27/4

17:30-09:15

1 stop31h 45m

Cardiff Wales

Fri 1/5

17:15-11:42

1 stop26h 27m

£860

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 27/4

12:10-16:45

2 stops20h 35m

Cardiff Wales

Fri 1/5

17:15-11:42

1 stop26h 27m

£863

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 27/4

12:10-16:45

2 stops20h 35m

Cardiff Wales

Fri 1/5

09:45-21:50

2 stops20h 05m

£870

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

15:35-19:10

2 stops20h 35m

Cardiff Wales

Tue 24/3

17:25-19:20

3 stops32h 55m

£879

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

13:50-16:45

1 stop18h 55m

Cardiff Wales

Tue 30/6

17:15-16:20

1 stop31h 05m

£887

Flights are sorted by cheapest return flights first.

Showing 1-10 of 13 resultsSorted 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	17h 50m
Direct flights	None

The fastest flight from Seattle to Cardiff takes 17h 50m

There are no direct flights from Seattle to Cardiff. There are no popular flight routes from Seattle to Cardiff.

Search flight deals

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 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.

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.

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.