Latest deals
When to book
FAQs
Price Alerts

Cheap flights from Seattle to Cardiff from £571

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 18/4. 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
15:40 - 21:20
SEA
-
CWL
21h 40m
2 stops
Multiple Airlines Logo
07:30 - 17:55
CWL
-
SEA
18h 25m
2 stops
£571Multiple Airlines
Sat, 18 Apr - Sat, 25 Apr
Multiple Airlines Logo
19:10 - 22:50
SEA
-
CWL
19h 40m
1 stop
Multiple Airlines Logo
22:25 - 19:25
CWL
-
SEA
29h 00m
2 stops
£583Multiple Airlines
Mon, 6 Apr - Mon, 13 Apr
Multiple Airlines Logo
15:40 - 22:00
SEA
-
CWL
22h 20m
2 stops
Multiple Airlines Logo
22:45 - 14:19
CWL
-
SEA
47h 34m
3 stops
£642Multiple Airlines
Sun, 12 Apr - Fri, 17 Apr
KLM Logo
17:30 - 16:45
SEA
-
CWL
15h 15m
1 stop
KLM Logo
09:45 - 11:45
CWL
-
SEA
34h 00m
1 stop
£654KLM
Sat, 18 Apr - Sat, 25 Apr
Multiple Airlines Logo
19:10 - 22:00
SEA
-
CWL
18h 50m
1 stop
Multiple Airlines Logo
22:45 - 14:19
CWL
-
SEA
47h 34m
3 stops
£656Multiple Airlines
Sun, 12 Apr - Fri, 17 Apr
Multiple Airlines Logo
23:11 - 09:15
SEA
-
CWL
26h 04m
2 stops
Multiple Airlines Logo
17:35 - 11:45
CWL
-
SEA
26h 10m
1 stop
£656Multiple Airlines
Sat, 18 Apr - Sat, 25 Apr
KLM Logo
17:30 - 16:45
SEA
-
CWL
15h 15m
1 stop
KLM Logo
09:45 - 11:45
CWL
-
SEA
34h 00m
1 stop
£657KLM
Mon, 6 Apr - Mon, 13 Apr
KLM Logo
19:35 - 09:15
SEA
-
CWL
53h 40m
2 stops
KLM Logo
17:15 - 22:23
CWL
-
SEA
37h 08m
2 stops
£661KLM
Tue, 7 Apr - Tue, 14 Apr
Scandinavian Airlines Logo
17:35 - 09:15
SEA
-
CWL
31h 40m
1 stop
Scandinavian Airlines Logo
17:35 - 11:45
CWL
-
SEA
26h 10m
1 stop
£690Scandinavian Airlines
Sat, 18 Apr - Sat, 25 Apr
KLM Logo
09:55 - 09:50
SEA
-
CWL
16h 55m
2 stops
KLM Logo
17:15 - 12:35
CWL
-
SEA
26h 20m
1 stop
£717KLM
Tue, 17 Mar - Mon, 23 Mar

KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets
KLM
18 Apr
SEA17:30Seattle/Tacoma Intl
15h 15m
1 stop
CWL16:45Cardiff Wales
25 Apr
CWL09:45Cardiff Wales
34h 00m
1 stop
SEA11:45Seattle/Tacoma Intl
£654
KLM
6 Apr
SEA17:30Seattle/Tacoma Intl
15h 15m
1 stop
CWL16:45Cardiff Wales
13 Apr
CWL09:45Cardiff Wales
34h 00m
1 stop
SEA11:45Seattle/Tacoma Intl
£657
KLM
7 Apr
SEA19:35Seattle/Tacoma Intl
53h 40m
2 stops
CWL09:15Cardiff Wales
14 Apr
CWL17:15Cardiff Wales
37h 08m
2 stops
SEA22:23Seattle/Tacoma Intl
£661

Scandinavian Airlines flights from Seattle to Cardiff

Our best Scandinavian Airlines deals on Seattle to Cardiff flight tickets
Scandinavian Airlines
18 Apr
SEA17:35Seattle/Tacoma Intl
31h 40m
1 stop
CWL09:15Cardiff Wales
25 Apr
CWL17:35Cardiff Wales
26h 10m
1 stop
SEA11:45Seattle/Tacoma Intl
£690
Scandinavian Airlines
11 Apr
SEA17:35Seattle/Tacoma Intl
31h 40m
1 stop
CWL09:15Cardiff Wales
18 Apr
CWL17:35Cardiff Wales
36h 15m
2 stops
SEA21:50Seattle/Tacoma Intl
£862
Scandinavian Airlines
11 Apr
SEA22:58Seattle/Tacoma Intl
26h 17m
2 stops
CWL09:15Cardiff Wales
18 Apr
CWL17:35Cardiff Wales
32h 53m
2 stops
SEA18:28Seattle/Tacoma Intl
£971

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 23 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

Sat 18/4

15:40-21:20

2 stops21h 40m

Cardiff Wales

Sat 25/4

07:30-17:55

2 stops18h 25m

£571

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 6/4

19:10-22:50

1 stop19h 40m

Cardiff Wales

Mon 13/4

22:25-19:25

2 stops29h 00m

£583

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 12/4

15:40-22:00

2 stops22h 20m

Cardiff Wales

Fri 17/4

22:45-14:19

3 stops47h 34m

£642

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 18/4

17:30-16:45

1 stop15h 15m

Cardiff Wales

Sat 25/4

09:45-11:45

1 stop34h 00m

£654

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 12/4

19:10-22:00

1 stop18h 50m

Cardiff Wales

Fri 17/4

22:45-14:19

3 stops47h 34m

£656

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 18/4

23:11-09:15

2 stops26h 04m

Cardiff Wales

Sat 25/4

17:35-11:45

1 stop26h 10m

£656

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 6/4

17:30-16:45

1 stop15h 15m

Cardiff Wales

Mon 13/4

09:45-11:45

1 stop34h 00m

£657

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 7/4

19:35-09:15

2 stops53h 40m

Cardiff Wales

Tue 14/4

17:15-22:23

2 stops37h 08m

£661

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 18/4

17:35-09:15

1 stop31h 40m

Cardiff Wales

Sat 25/4

17:35-11:45

1 stop26h 10m

£690

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 17/3

09:55-09:50

2 stops16h 55m

Cardiff Wales

Mon 23/3

17:15-12:35

1 stop26h 20m

£717

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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 25/3
Wed 1/4
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