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Cheap flights from Seattle to Cardiff from £748

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 27/4. 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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Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
19:10 - 22:50
SEA
-
CWL
19h 40m
1 stop
Multiple Airlines Logo
22:10 - 18:45
CWL
-
SEA
28h 35m
2 stops
£748Multiple Airlines
Mon, 27 Apr - Mon, 4 May
Multiple Airlines Logo
19:10 - 22:50
SEA
-
CWL
19h 40m
1 stop
Multiple Airlines Logo
22:10 - 19:23
CWL
-
SEA
29h 13m
2 stops
£768Multiple Airlines
Mon, 20 Apr - Mon, 27 Apr
Air France Logo
17:35 - 16:45
SEA
-
CWL
15h 10m
1 stop
Air France Logo
17:15 - 16:30
CWL
-
SEA
31h 15m
1 stop
£784Air France
Mon, 20 Apr - Mon, 27 Apr
Virgin Atlantic Logo
06:00 - 09:15
SEA
-
CWL
19h 15m
2 stops
Virgin Atlantic Logo
17:15 - 16:48
CWL
-
SEA
31h 33m
2 stops
£785Virgin Atlantic
Mon, 20 Apr - Mon, 27 Apr
KLM Logo
17:40 - 09:15
SEA
-
CWL
31h 35m
1 stop
KLM Logo
09:45 - 11:37
CWL
-
SEA
33h 52m
1 stop
£811KLM
Sun, 17 May - Mon, 1 Jun
Multiple Airlines Logo
15:40 - 09:15
SEA
-
CWL
33h 35m
3 stops
Multiple Airlines Logo
17:15 - 18:45
CWL
-
SEA
33h 30m
3 stops
£816Multiple Airlines
Mon, 20 Apr - Mon, 27 Apr
KLM Logo
17:35 - 16:45
SEA
-
CWL
15h 10m
1 stop
KLM Logo
17:15 - 11:42
CWL
-
SEA
26h 27m
1 stop
£824KLM
Mon, 27 Apr - Mon, 4 May
Delta Logo
12:00 - 16:45
SEA
-
CWL
20h 45m
2 stops
Delta Logo
09:45 - 22:05
CWL
-
SEA
20h 20m
2 stops
£827Delta
Thu, 17 Sep - Thu, 24 Sep
Multiple Airlines Logo
19:00 - 09:10
SEA
-
CWL
30h 10m
2 stops
Multiple Airlines Logo
22:45 - 17:10
CWL
-
SEA
26h 25m
1 stop
£828Multiple Airlines
Fri, 8 May - Fri, 15 May
Air France Logo
13:50 - 16:45
SEA
-
CWL
18h 55m
1 stop
Air France Logo
09:45 - 22:05
CWL
-
SEA
20h 20m
2 stops
£846Air France
Thu, 17 Sep - Thu, 24 Sep

KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets
KLM
17 May
SEA17:40Seattle/Tacoma Intl
31h 35m
1 stop
CWL09:15Cardiff Wales
1 Jun
CWL09:45Cardiff Wales
33h 52m
1 stop
SEA11:37Seattle/Tacoma Intl
£811
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
£824
KLM
27 Apr
SEA08:20Seattle/Tacoma Intl
16h 55m
2 stops
CWL09:15Cardiff Wales
4 May
CWL09:45Cardiff Wales
20h 05m
2 stops
SEA21:50Seattle/Tacoma Intl
£872

Air France flights from Seattle to Cardiff

Our best Air France deals on Seattle to Cardiff flight tickets
Air France
20 Apr
SEA17:35Seattle/Tacoma Intl
15h 10m
1 stop
CWL16:45Cardiff Wales
27 Apr
CWL17:15Cardiff Wales
31h 15m
1 stop
SEA16:30Seattle/Tacoma Intl
£784
Air France
17 Sept
SEA13:50Seattle/Tacoma Intl
18h 55m
1 stop
CWL16:45Cardiff Wales
24 Sept
CWL09:45Cardiff Wales
20h 20m
2 stops
SEA22:05Seattle/Tacoma Intl
£846

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 25 March 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

Mon 27/4

19:10-22:50

1 stop19h 40m

Cardiff Wales

Mon 4/5

22:10-18:45

2 stops28h 35m

£748

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 20/4

19:10-22:50

1 stop19h 40m

Cardiff Wales

Mon 27/4

22:10-19:23

2 stops29h 13m

£768

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 20/4

17:35-16:45

1 stop15h 10m

Cardiff Wales

Mon 27/4

17:15-16:30

1 stop31h 15m

£784

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 20/4

06:00-09:15

2 stops19h 15m

Cardiff Wales

Mon 27/4

17:15-16:48

2 stops31h 33m

£785

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 17/5

17:40-09:15

1 stop31h 35m

Cardiff Wales

Mon 1/6

09:45-11:37

1 stop33h 52m

£811

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 20/4

15:40-09:15

3 stops33h 35m

Cardiff Wales

Mon 27/4

17:15-18:45

3 stops33h 30m

£816

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 27/4

17:35-16:45

1 stop15h 10m

Cardiff Wales

Mon 4/5

17:15-11:42

1 stop26h 27m

£824

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 17/9

12:00-16:45

2 stops20h 45m

Cardiff Wales

Thu 24/9

09:45-22:05

2 stops20h 20m

£827

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 8/5

19:00-09:10

2 stops30h 10m

Cardiff Wales

Fri 15/5

22:45-17:10

1 stop26h 25m

£828
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 17/9

13:50-16:45

1 stop18h 55m

Cardiff Wales

Thu 24/9

09:45-22:05

2 stops20h 20m

£846

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

20h 45m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 20h 45m
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 20h 45m 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