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Cheap flights from Seattle to Cardiff from £236

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 8/3. 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.
Air Europa Logo
16:05 - 16:55
SEA
-
CWL
17h 50m
1 stop
Air Europa Logo
10:20 - 10:45
CWL
-
SEA
31h 25m
2 stops
£647Air Europa
Tue, 17 Mar - Tue, 24 Mar
Scandinavian Airlines Logo
07:20 - 09:50
SEA
-
CWL
19h 30m
2 stops
Scandinavian Airlines Logo
10:20 - 10:45
CWL
-
SEA
31h 25m
2 stops
£650Scandinavian Airlines
Tue, 17 Mar - Tue, 24 Mar
Air France Logo
13:45 - 16:45
SEA
-
CWL
19h 00m
1 stop
Air France Logo
09:45 - 22:05
CWL
-
SEA
20h 20m
2 stops
£657Air France
Wed, 8 Apr - Wed, 29 Apr
Delta Logo
16:05 - 16:55
SEA
-
CWL
17h 50m
1 stop
Delta Logo
10:20 - 22:22
CWL
-
SEA
19h 02m
2 stops
£682Delta
Tue, 17 Mar - Tue, 24 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
£685Delta
Tue, 17 Mar - Tue, 24 Mar
Virgin Atlantic Logo
22:58 - 16:45
SEA
-
CWL
33h 47m
2 stops
Virgin Atlantic Logo
09:45 - 11:45
CWL
-
SEA
34h 00m
1 stop
£688Virgin Atlantic
Sat, 28 Mar - Sat, 4 Apr
Delta Logo
17:30 - 15:45
SEA
-
CWL
15h 15m
1 stop
Delta Logo
09:45 - 16:30
CWL
-
SEA
14h 45m
1 stop
£724Delta
Sat, 28 Mar - Sat, 4 Apr
KLM Logo
16:05 - 09:50
SEA
-
CWL
34h 45m
1 stop
KLM Logo
10:20 - 12:35
CWL
-
SEA
33h 15m
1 stop
£746KLM
Tue, 17 Mar - Tue, 24 Mar
KLM Logo
08:25 - 09:50
SEA
-
CWL
18h 25m
2 stops
KLM Logo
10:20 - 12:35
CWL
-
SEA
33h 15m
1 stop
£749KLM
Tue, 17 Mar - Mon, 23 Mar
WestJet Logo
07:00 - 10:15
SEA
-
CWL
43h 15m
2 stops
WestJet Logo
11:35 - 21:00
CWL
-
SEA
41h 25m
2 stops
£751WestJet
Tue, 23 Jun - Tue, 30 Jun

KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets
KLM
31 Mar
SEA17:30Seattle/Tacoma Intl
31h 45m
1 stop
CWL09:15Cardiff Wales
7 Apr
CWL09:45Cardiff Wales
14h 45m
1 stop
SEA16:30Seattle/Tacoma Intl
£573
KLM
17 Mar
SEA09:55Seattle/Tacoma Intl
16h 55m
2 stops
CWL09:50Cardiff Wales
23 Mar
CWL17:15Cardiff Wales
26h 20m
1 stop
SEA12:35Seattle/Tacoma Intl
£639
KLM
17 Mar
SEA16:05Seattle/Tacoma Intl
17h 50m
1 stop
CWL16:55Cardiff Wales
23 Mar
CWL17:15Cardiff Wales
26h 20m
1 stop
SEA12:35Seattle/Tacoma Intl
£675

Delta flights from Seattle to Cardiff

Our best Delta deals on Seattle to Cardiff flight tickets
Delta
31 Mar
SEA07:15Seattle/Tacoma Intl
18h 00m
2 stops
CWL09:15Cardiff Wales
7 Apr
CWL09:45Cardiff Wales
14h 45m
1 stop
SEA16:30Seattle/Tacoma Intl
£576
Delta
31 Mar
SEA07:15Seattle/Tacoma Intl
18h 00m
2 stops
CWL09:15Cardiff Wales
7 Apr
CWL09:45Cardiff Wales
20h 25m
2 stops
SEA22:10Seattle/Tacoma Intl
£583
Delta
17 Mar
SEA16:05Seattle/Tacoma Intl
17h 50m
1 stop
CWL16:55Cardiff Wales
24 Mar
CWL10:20Cardiff Wales
19h 02m
2 stops
SEA22:22Seattle/Tacoma Intl
£682

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 14 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 17/3

16:05-16:55

1 stop17h 50m

Cardiff Wales

Tue 24/3

10:20-10:45

2 stops31h 25m

£647

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

07:20-09:50

2 stops19h 30m

Cardiff Wales

Tue 24/3

10:20-10:45

2 stops31h 25m

£650

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 8/4

13:45-16:45

1 stop19h 00m

Cardiff Wales

Wed 29/4

09:45-22:05

2 stops20h 20m

£657

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

16:05-16:55

1 stop17h 50m

Cardiff Wales

Tue 24/3

10:20-22:22

2 stops19h 02m

£682

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

07:20-09:50

2 stops19h 30m

Cardiff Wales

Tue 24/3

10:20-22:22

2 stops19h 02m

£685

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 28/3

22:58-16:45

2 stops33h 47m

Cardiff Wales

Sat 4/4

09:45-11:45

1 stop34h 00m

£688

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 28/3

17:30-15:45

1 stop15h 15m

Cardiff Wales

Sat 4/4

09:45-16:30

1 stop14h 45m

£724

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

£746

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

08:25-09:50

2 stops18h 25m

Cardiff Wales

Mon 23/3

10:20-12:35

1 stop33h 15m

£749

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 23/6

07:00-10:15

2 stops43h 15m

Cardiff Wales

Tue 30/6

11:35-21:00

2 stops41h 25m

£751

Flights are sorted by cheapest return flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
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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?

WestJet 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

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.

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

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Find better results for your trip to the United Kingdom

Airports servicing Wales

Holyhead Anglesey Airport