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Cheap flights from Seattle to Cardiff from £276

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 29/1. 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.
Delta Logo
15:10 - 16:45SEA-CWL
17h 35m1 stop
Delta Logo
10:20 - 11:50CWL-SEA
33h 30m1 stop
£572Delta
Find Deal
Thu, 22 Jan - Mon, 26 Jan
Delta Logo
15:10 - 09:50SEA-CWL
34h 40m1 stop
Delta Logo
10:20 - 11:50CWL-SEA
33h 30m1 stop
£574Delta
Find Deal
Thu, 22 Jan - Mon, 26 Jan
Delta Logo
08:00 - 09:50SEA-CWL
17h 50m2 stops
Delta Logo
10:20 - 11:50CWL-SEA
33h 30m1 stop
£576Delta
Find Deal
Thu, 22 Jan - Mon, 26 Jan
Delta Logo
08:00 - 09:50SEA-CWL
17h 50m2 stops
Delta Logo
10:20 - 11:50CWL-SEA
33h 30m1 stop
£577Delta
Find Deal
Thu, 22 Jan - Mon, 26 Jan
Delta Logo
09:55 - 16:45SEA-CWL
22h 50m2 stops
Delta Logo
10:20 - 22:25CWL-SEA
20h 05m2 stops
£586Delta
Find Deal
Thu, 22 Jan - Mon, 26 Jan

Delta flights from Seattle to Cardiff

Our best Delta deals on Seattle to Cardiff flight tickets
Delta
22 Jan
SEA15:10Seattle/Tacoma Intl
34h 40m
1 stop
CWL09:50Cardiff Wales
26 Jan
CWL10:20Cardiff Wales
33h 30m
1 stop
SEA11:50Seattle/Tacoma Intl
£572
Find similar
Delta
22 Jan
SEA15:10Seattle/Tacoma Intl
34h 40m
1 stop
CWL09:50Cardiff Wales
26 Jan
CWL10:20Cardiff Wales
33h 30m
1 stop
SEA11:50Seattle/Tacoma Intl
£574
Find similar
Delta
22 Jan
SEA07:10Seattle/Tacoma Intl
18h 40m
2 stops
CWL09:50Cardiff Wales
26 Jan
CWL10:20Cardiff Wales
33h 30m
1 stop
SEA11:50Seattle/Tacoma Intl
£576
Find similar

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 27 November 2025.
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

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 22/1

15:10-16:45

1 stop17h 35m

Cardiff Wales

Mon 26/1

10:20-11:50

1 stop33h 30m

£572

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 22/1

15:10-09:50

1 stop34h 40m

Cardiff Wales

Mon 26/1

10:20-11:50

1 stop33h 30m

£574

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 22/1

08:00-09:50

2 stops17h 50m

Cardiff Wales

Mon 26/1

10:20-11:50

1 stop33h 30m

£576

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 22/1

08:00-09:50

2 stops17h 50m

Cardiff Wales

Mon 26/1

10:20-11:50

1 stop33h 30m

£577

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 22/1

09:55-16:45

2 stops22h 50m

Cardiff Wales

Mon 26/1

10:20-22:25

2 stops20h 05m

£586

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 29/1

14:35-19:40

3 stops45h 05m

£276

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 29/1

10:09-19:40

2 stops49h 31m

£302

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 29/1

15:10-16:45

1 stop17h 35m

£351

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

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?

Virgin Atlantic 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

15h 10m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 15h 10m
There are no direct flights from Seattle to Cardiff. There are no popular flight routes from Seattle to Cardiff.
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  • 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.

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