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Cheap flights from Seattle to Cardiff from £711

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 6/4. 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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Find the cheapest flights from Seattle to Cardiff

Cheap return flights

Enter your travel dates to find the best prices.
KLM Logo
17:35 - 09:15
SEA
-
CWL
31h 40m
1 stop
KLM Logo
09:45 - 11:45
CWL
-
SEA
34h 00m
1 stop
£711KLM
Mon, 6 Apr - Mon, 13 Apr
KLM Logo
07:20 - 09:15
SEA
-
CWL
17h 55m
2 stops
KLM Logo
17:15 - 11:40
CWL
-
SEA
26h 25m
1 stop
£714KLM
Tue, 21 Apr - Tue, 28 Apr
Multiple Airlines Logo
19:10 - 22:50
SEA
-
CWL
19h 40m
1 stop
Multiple Airlines Logo
23:30 - 19:19
CWL
-
SEA
27h 49m
2 stops
£734Multiple Airlines
Mon, 4 May - Wed, 13 May
Multiple Airlines Logo
19:10 - 22:20
SEA
-
CWL
19h 10m
1 stop
Multiple Airlines Logo
22:50 - 19:23
CWL
-
SEA
28h 33m
2 stops
£735Multiple Airlines
Thu, 23 Apr - Thu, 30 Apr
Delta Logo
22:40 - 09:15
SEA
-
CWL
26h 35m
2 stops
Delta Logo
09:45 - 11:42
CWL
-
SEA
33h 57m
1 stop
£748Delta
Sun, 3 May - Thu, 14 May
KLM Logo
17:35 - 09:15
SEA
-
CWL
31h 40m
1 stop
KLM Logo
17:15 - 11:40
CWL
-
SEA
26h 25m
1 stop
£751KLM
Thu, 23 Apr - Thu, 30 Apr
KLM Logo
17:35 - 09:15
SEA
-
CWL
31h 40m
1 stop
KLM Logo
09:45 - 22:29
CWL
-
SEA
20h 44m
2 stops
£752KLM
Sun, 3 May - Tue, 12 May
Multiple Airlines Logo
19:10 - 21:45
SEA
-
CWL
18h 35m
1 stop
Multiple Airlines Logo
22:45 - 19:19
CWL
-
SEA
28h 34m
2 stops
£754Multiple Airlines
Sun, 3 May - Fri, 15 May
Delta Logo
07:15 - 09:15
SEA
-
CWL
18h 00m
2 stops
Delta Logo
09:45 - 22:31
CWL
-
SEA
20h 46m
2 stops
£758Delta
Thu, 23 Apr - Thu, 30 Apr
Air Europa Logo
17:35 - 16:45
SEA
-
CWL
15h 10m
1 stop
Air Europa Logo
17:15 - 19:59
CWL
-
SEA
34h 44m
2 stops
£775Air Europa
Mon, 6 Apr - Mon, 13 Apr

Delta flights from Seattle to Cardiff

Our best Delta deals on Seattle to Cardiff flight tickets
Delta
3 May
SEA22:40Seattle/Tacoma Intl
26h 35m
2 stops
CWL09:15Cardiff Wales
14 May
CWL09:45Cardiff Wales
33h 57m
1 stop
SEA11:42Seattle/Tacoma Intl
£748
Delta
3 May
SEA16:00Seattle/Tacoma Intl
33h 15m
2 stops
CWL09:15Cardiff Wales
13 May
CWL09:45Cardiff Wales
21h 59m
2 stops
SEA23:44Seattle/Tacoma Intl
£752
Delta
23 Apr
SEA07:15Seattle/Tacoma Intl
18h 00m
2 stops
CWL09:15Cardiff Wales
30 Apr
CWL09:45Cardiff Wales
20h 46m
2 stops
SEA22:31Seattle/Tacoma Intl
£758

WestJet flights from Seattle to Cardiff

Our best WestJet deals on Seattle to Cardiff flight tickets
WestJet
30 May
SEA19:35Seattle/Tacoma Intl
54h 40m
2 stops
CWL10:15Cardiff Wales
30 Jun
CWL11:35Cardiff Wales
39h 10m
2 stops
SEA18:45Seattle/Tacoma Intl
£823
WestJet
30 May
SEA19:35Seattle/Tacoma Intl
54h 40m
2 stops
CWL10:15Cardiff Wales
30 Jun
CWL11:35Cardiff Wales
41h 25m
2 stops
SEA21:00Seattle/Tacoma Intl
£831
WestJet
30 May
SEA19:35Seattle/Tacoma Intl
54h 40m
2 stops
CWL10:15Cardiff Wales
30 Jun
CWL11:35Cardiff Wales
41h 25m
2 stops
SEA21:00Seattle/Tacoma Intl
£848

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 12 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 6/4

17:35-09:15

1 stop31h 40m

Cardiff Wales

Mon 13/4

09:45-11:45

1 stop34h 00m

£711

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 21/4

07:20-09:15

2 stops17h 55m

Cardiff Wales

Tue 28/4

17:15-11:40

1 stop26h 25m

£714

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 4/5

19:10-22:50

1 stop19h 40m

Cardiff Wales

Wed 13/5

23:30-19:19

2 stops27h 49m

£734

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 23/4

19:10-22:20

1 stop19h 10m

Cardiff Wales

Thu 30/4

22:50-19:23

2 stops28h 33m

£735

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 3/5

22:40-09:15

2 stops26h 35m

Cardiff Wales

Thu 14/5

09:45-11:42

1 stop33h 57m

£748

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 23/4

17:35-09:15

1 stop31h 40m

Cardiff Wales

Thu 30/4

17:15-11:40

1 stop26h 25m

£751

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 3/5

17:35-09:15

1 stop31h 40m

Cardiff Wales

Tue 12/5

09:45-22:29

2 stops20h 44m

£752

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 3/5

19:10-21:45

1 stop18h 35m

Cardiff Wales

Fri 15/5

22:45-19:19

2 stops28h 34m

£754
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 23/4

07:15-09:15

2 stops18h 00m

Cardiff Wales

Thu 30/4

09:45-22:31

2 stops20h 46m

£758

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 6/4

17:35-16:45

1 stop15h 10m

Cardiff Wales

Mon 13/4

17:15-19:59

2 stops34h 44m

£775

Flights are sorted by cheapest return flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

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?

Air France and KLM are the most popular carriers 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

19h 40m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 19h 40m
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 19h 40m 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