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Cheap flights from Seattle to Cardiff from £562

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 10/3. 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.
KLM Logo
16:05 - 16:55
SEA
-
CWL
17h 50m
1 stop
KLM Logo
17:25 - 12:35
CWL
-
SEA
26h 10m
1 stop
£562KLM
Tue, 10 Mar - Tue, 17 Mar
KLM Logo
09:55 - 09:50
SEA
-
CWL
16h 55m
2 stops
KLM Logo
17:25 - 12:35
CWL
-
SEA
26h 10m
1 stop
£566KLM
Tue, 10 Mar - Tue, 17 Mar
Delta Logo
07:20 - 09:50
SEA
-
CWL
19h 30m
2 stops
Delta Logo
10:20 - 22:22
CWL
-
SEA
19h 02m
2 stops
£573Delta
Tue, 10 Mar - Tue, 17 Mar
Delta Logo
07:15 - 09:50
SEA
-
CWL
19h 35m
2 stops
Delta Logo
09:45 - 22:10
CWL
-
SEA
20h 25m
2 stops
£648Delta
Mon, 23 Mar - Mon, 30 Mar
KLM Logo
08:25 - 09:50
SEA
-
CWL
18h 25m
2 stops
KLM Logo
17:15 - 12:35
CWL
-
SEA
26h 20m
1 stop
£710KLM
Tue, 17 Mar - Mon, 23 Mar
KLM Logo
16:05 - 16:55
SEA
-
CWL
17h 50m
1 stop
KLM Logo
17:15 - 12:35
CWL
-
SEA
26h 20m
1 stop
£746KLM
Tue, 17 Mar - Mon, 23 Mar
Virgin Atlantic Logo
07:20 - 09:50
SEA
-
CWL
19h 30m
2 stops
Virgin Atlantic Logo
17:15 - 11:45
CWL
-
SEA
26h 30m
1 stop
£748Virgin Atlantic
Mon, 23 Mar - Mon, 30 Mar
KLM Logo
08:25 - 09:50
SEA
-
CWL
18h 25m
2 stops
KLM Logo
17:15 - 12:35
CWL
-
SEA
26h 20m
1 stop
£749KLM
Tue, 17 Mar - Mon, 23 Mar
WestJet Logo
10:30 - 10:15
SEA
-
CWL
39h 45m
2 stops
WestJet Logo
11:35 - 21:00
CWL
-
SEA
41h 25m
2 stops
£752WestJet
Tue, 23 Jun - Tue, 30 Jun
Multiple Airlines Logo
08:25 - 09:50
SEA
-
CWL
18h 25m
2 stops
Multiple Airlines Logo
10:20 - 22:22
CWL
-
SEA
19h 02m
2 stops
£756Multiple Airlines
Tue, 17 Mar - Mon, 23 Mar

WestJet flights from Seattle to Cardiff

Our best WestJet deals on Seattle to Cardiff flight tickets
WestJet
23 Jun
SEA10:30Seattle/Tacoma Intl
39h 45m
2 stops
CWL10:15Cardiff Wales
30 Jun
CWL11:35Cardiff Wales
41h 25m
2 stops
SEA21:00Seattle/Tacoma Intl
£752
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
£806

Air France flights from Seattle to Cardiff

Our best Air France deals on Seattle to Cardiff flight tickets
Air France
23 Jun
SEA13:50Seattle/Tacoma Intl
18h 55m
1 stop
CWL16:45Cardiff Wales
30 Jun
CWL09:45Cardiff Wales
33h 48m
1 stop
SEA11:33Seattle/Tacoma Intl
£789
Air France
23 Jun
SEA17:35Seattle/Tacoma Intl
15h 10m
1 stop
CWL16:45Cardiff Wales
30 Jun
CWL09:45Cardiff Wales
14h 39m
1 stop
SEA16:24Seattle/Tacoma Intl
£838

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 10 February 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

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 10/3

16:05-16:55

1 stop17h 50m

Cardiff Wales

Tue 17/3

17:25-12:35

1 stop26h 10m

£562

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 10/3

09:55-09:50

2 stops16h 55m

Cardiff Wales

Tue 17/3

17:25-12:35

1 stop26h 10m

£566

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 10/3

07:20-09:50

2 stops19h 30m

Cardiff Wales

Tue 17/3

10:20-22:22

2 stops19h 02m

£573

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 23/3

07:15-09:50

2 stops19h 35m

Cardiff Wales

Mon 30/3

09:45-22:10

2 stops20h 25m

£648

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

08:25-09:50

2 stops18h 25m

Cardiff Wales

Mon 23/3

17:15-12:35

1 stop26h 20m

£710

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

16:05-16:55

1 stop17h 50m

Cardiff Wales

Mon 23/3

17:15-12:35

1 stop26h 20m

£746

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 23/3

07:20-09:50

2 stops19h 30m

Cardiff Wales

Mon 30/3

17:15-11:45

1 stop26h 30m

£748

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

08:25-09:50

2 stops18h 25m

Cardiff Wales

Mon 23/3

17:15-12:35

1 stop26h 20m

£749

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

10:30-10:15

2 stops39h 45m

Cardiff Wales

Tue 30/6

11:35-21:00

2 stops41h 25m

£752

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

08:25-09:50

2 stops18h 25m

Cardiff Wales

Mon 23/3

10:20-22:22

2 stops19h 02m

£756

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

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.

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