Latest deals
When to book
FAQs
Price Alerts

Cheap flights from Seattle to Cardiff from £728

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 29/4. 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
Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to Cardiff

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
19:10 - 22:25
SEA
-
CWL
19h 15m
1 stop
Multiple Airlines Logo
23:30 - 19:23
CWL
-
SEA
27h 53m
2 stops
£728Multiple Airlines
Wed, 29 Apr - Wed, 6 May
KLM Logo
17:35 - 09:15
SEA
-
CWL
31h 40m
1 stop
KLM Logo
09:45 - 11:42
CWL
-
SEA
33h 57m
1 stop
£753KLM
Tue, 28 Apr - Tue, 5 May
KLM Logo
07:20 - 09:15
SEA
-
CWL
17h 55m
2 stops
KLM Logo
17:15 - 11:42
CWL
-
SEA
26h 27m
1 stop
£756KLM
Tue, 28 Apr - Tue, 5 May
KLM Logo
07:20 - 09:15
SEA
-
CWL
17h 55m
2 stops
KLM Logo
09:45 - 21:49
CWL
-
SEA
20h 04m
2 stops
£764KLM
Tue, 28 Apr - Tue, 5 May
Air France Logo
13:45 - 16:45
SEA
-
CWL
19h 00m
1 stop
Air France Logo
17:15 - 16:30
CWL
-
SEA
31h 15m
1 stop
£766Air France
Wed, 13 May - Wed, 27 May
Multiple Airlines Logo
10:30 - 23:05
SEA
-
CWL
28h 35m
2 stops
Multiple Airlines Logo
23:15 - 17:10
CWL
-
SEA
25h 55m
1 stop
£767Multiple Airlines
Tue, 19 May - Tue, 16 Jun
Multiple Airlines Logo
05:40 - 22:20
SEA
-
CWL
32h 40m
3 stops
Multiple Airlines Logo
11:35 - 09:52
CWL
-
SEA
30h 17m
3 stops
£771Multiple Airlines
Thu, 21 May - Sat, 20 Jun
Multiple Airlines Logo
10:30 - 23:05
SEA
-
CWL
28h 35m
2 stops
Multiple Airlines Logo
23:30 - 17:10
CWL
-
SEA
25h 40m
1 stop
£776Multiple Airlines
Tue, 19 May - Wed, 17 Jun
Multiple Airlines Logo
19:35 - 10:15
SEA
-
CWL
54h 40m
2 stops
Multiple Airlines Logo
11:35 - 09:52
CWL
-
SEA
30h 17m
3 stops
£776Multiple Airlines
Wed, 20 May - Sat, 20 Jun
Delta Logo
07:15 - 16:45
SEA
-
CWL
25h 30m
2 stops
Delta Logo
09:45 - 16:24
CWL
-
SEA
14h 39m
1 stop
£782Delta
Mon, 18 May - Thu, 18 Jun

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
41h 25m
2 stops
SEA21:00Seattle/Tacoma Intl
£867
WestJet
30 May
SEA19:35Seattle/Tacoma Intl
30h 40m
2 stops
CWL10:15Cardiff Wales
30 Jun
CWL11:35Cardiff Wales
27h 56m
2 stops
SEA07:31Seattle/Tacoma Intl
£899
WestJet
22 May
SEA10:30Seattle/Tacoma Intl
15h 45m
2 stops
CWL10:15Cardiff Wales
16 Jun
CWL11:35Cardiff Wales
17h 25m
2 stops
SEA21:00Seattle/Tacoma Intl
£899

KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets
KLM
28 Apr
SEA17:35Seattle/Tacoma Intl
31h 40m
1 stop
CWL09:15Cardiff Wales
5 May
CWL09:45Cardiff Wales
33h 57m
1 stop
SEA11:42Seattle/Tacoma Intl
£753
KLM
28 Apr
SEA07:20Seattle/Tacoma Intl
17h 55m
2 stops
CWL09:15Cardiff Wales
5 May
CWL17:15Cardiff Wales
26h 27m
1 stop
SEA11:42Seattle/Tacoma Intl
£756
KLM
28 Apr
SEA07:20Seattle/Tacoma Intl
17h 55m
2 stops
CWL09:15Cardiff Wales
5 May
CWL09:45Cardiff Wales
20h 04m
2 stops
SEA21:49Seattle/Tacoma Intl
£764

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 19 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

Wed 29/4

19:10-22:25

1 stop19h 15m

Cardiff Wales

Wed 6/5

23:30-19:23

2 stops27h 53m

£728

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 28/4

17:35-09:15

1 stop31h 40m

Cardiff Wales

Tue 5/5

09:45-11:42

1 stop33h 57m

£753

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 28/4

07:20-09:15

2 stops17h 55m

Cardiff Wales

Tue 5/5

17:15-11:42

1 stop26h 27m

£756
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 28/4

07:20-09:15

2 stops17h 55m

Cardiff Wales

Tue 5/5

09:45-21:49

2 stops20h 04m

£764

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 13/5

13:45-16:45

1 stop19h 00m

Cardiff Wales

Wed 27/5

17:15-16:30

1 stop31h 15m

£766

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 19/5

10:30-23:05

2 stops28h 35m

Cardiff Wales

Tue 16/6

23:15-17:10

1 stop25h 55m

£767

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 21/5

05:40-22:20

3 stops32h 40m

Cardiff Wales

Sat 20/6

11:35-09:52

3 stops30h 17m

£771

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 19/5

10:30-23:05

2 stops28h 35m

Cardiff Wales

Wed 17/6

23:30-17:10

1 stop25h 40m

£776

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 20/5

19:35-10:15

2 stops54h 40m

Cardiff Wales

Sat 20/6

11:35-09:52

3 stops30h 17m

£776

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 18/5

07:15-16:45

2 stops25h 30m

Cardiff Wales

Thu 18/6

09:45-16:24

1 stop14h 39m

£782

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

19h 00m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 19h 00m
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 00m 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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 18/4
Sat 25/4
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Airports servicing Wales

Holyhead Anglesey Airport