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Cheap flights from Seattle to Cardiff from £700

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 22/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
Multiple Airlines Logo
15:40 - 22:25
SEA
-
CWL
22h 45m
3 stops
Multiple Airlines Logo
23:30 - 09:40
CWL
-
SEA
42h 10m
3 stops
£700Multiple Airlines
Wed, 22 Apr - Wed, 6 May
Multiple Airlines Logo
15:40 - 22:25
SEA
-
CWL
22h 45m
3 stops
Multiple Airlines Logo
23:30 - 21:08
CWL
-
SEA
29h 38m
2 stops
£753Multiple Airlines
Wed, 22 Apr - Wed, 6 May
KLM Logo
17:45 - 16:45
SEA
-
CWL
15h 00m
1 stop
KLM Logo
09:45 - 11:37
CWL
-
SEA
33h 52m
1 stop
£820KLM
Tue, 11 Aug - Wed, 19 Aug
KLM Logo
07:20 - 09:15
SEA
-
CWL
17h 55m
2 stops
KLM Logo
17:15 - 11:37
CWL
-
SEA
26h 22m
1 stop
£823KLM
Tue, 11 Aug - Wed, 19 Aug
Multiple Airlines Logo
10:30 - 10:15
SEA
-
CWL
39h 45m
2 stops
Multiple Airlines Logo
11:35 - 19:19
CWL
-
SEA
15h 44m
1 stop
£829Multiple Airlines
Sat, 23 May - Sat, 30 May
Scandinavian Airlines Logo
06:00 - 09:15
SEA
-
CWL
19h 15m
2 stops
Scandinavian Airlines Logo
17:15 - 18:36
CWL
-
SEA
33h 21m
2 stops
£867Scandinavian Airlines
Tue, 11 Aug - Wed, 19 Aug
Delta Logo
22:40 - 09:15
SEA
-
CWL
26h 35m
2 stops
Delta Logo
09:50 - 16:27
CWL
-
SEA
14h 37m
1 stop
£880Delta
Sat, 8 Aug - Sun, 16 Aug
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
£886Multiple Airlines
Wed, 22 Apr - Wed, 6 May
KLM Logo
13:45 - 16:45
SEA
-
CWL
19h 00m
1 stop
KLM Logo
17:15 - 11:42
CWL
-
SEA
26h 27m
1 stop
£887KLM
Wed, 22 Apr - Wed, 6 May
Virgin Atlantic Logo
23:15 - 09:15
SEA
-
CWL
26h 00m
2 stops
Virgin Atlantic Logo
17:15 - 20:29
CWL
-
SEA
35h 14m
2 stops
£887Virgin Atlantic
Sat, 8 Aug - Sun, 16 Aug

Delta flights from Seattle to Cardiff

Our best Delta deals on Seattle to Cardiff flight tickets
Delta
8 Aug
SEA22:40Seattle/Tacoma Intl
26h 35m
2 stops
CWL09:15Cardiff Wales
16 Aug
CWL09:50Cardiff Wales
14h 37m
1 stop
SEA16:27Seattle/Tacoma Intl
£880
Delta
8 Aug
SEA17:30Seattle/Tacoma Intl
31h 45m
2 stops
CWL09:15Cardiff Wales
16 Aug
CWL09:50Cardiff Wales
32h 15m
2 stops
SEA10:05Seattle/Tacoma Intl
£893
Delta
8 Aug
SEA17:45Seattle/Tacoma Intl
31h 30m
1 stop
CWL09:15Cardiff Wales
16 Aug
CWL09:50Cardiff Wales
33h 47m
1 stop
SEA11:37Seattle/Tacoma Intl
£914

Virgin Atlantic flights from Seattle to Cardiff

Our best Virgin Atlantic deals on Seattle to Cardiff flight tickets
Virgin Atlantic
8 Aug
SEA23:15Seattle/Tacoma Intl
26h 00m
2 stops
CWL09:15Cardiff Wales
16 Aug
CWL17:15Cardiff Wales
35h 14m
2 stops
SEA20:29Seattle/Tacoma Intl
£887
Virgin Atlantic
8 Aug
SEA05:20Seattle/Tacoma Intl
27h 25m
2 stops
CWL16:45Cardiff Wales
16 Aug
CWL17:15Cardiff Wales
26h 22m
1 stop
SEA11:37Seattle/Tacoma Intl
£917
Virgin Atlantic
8 Aug
SEA05:20Seattle/Tacoma Intl
27h 25m
2 stops
CWL16:45Cardiff Wales
16 Aug
CWL17:15Cardiff Wales
31h 37m
2 stops
SEA16:52Seattle/Tacoma Intl
£925

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 9 April 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 22/4

15:40-22:25

3 stops22h 45m

Cardiff Wales

Wed 6/5

23:30-09:40

3 stops42h 10m

£700

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 22/4

15:40-22:25

3 stops22h 45m

Cardiff Wales

Wed 6/5

23:30-21:08

2 stops29h 38m

£753

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 11/8

17:45-16:45

1 stop15h 00m

Cardiff Wales

Wed 19/8

09:45-11:37

1 stop33h 52m

£820

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 11/8

07:20-09:15

2 stops17h 55m

Cardiff Wales

Wed 19/8

17:15-11:37

1 stop26h 22m

£823

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 23/5

10:30-10:15

2 stops39h 45m

Cardiff Wales

Sat 30/5

11:35-19:19

1 stop15h 44m

£829

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 11/8

06:00-09:15

2 stops19h 15m

Cardiff Wales

Wed 19/8

17:15-18:36

2 stops33h 21m

£867
Fastest return journey

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 8/8

22:40-09:15

2 stops26h 35m

Cardiff Wales

Sun 16/8

09:50-16:27

1 stop14h 37m

£880

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 22/4

19:10-22:25

1 stop19h 15m

Cardiff Wales

Wed 6/5

23:30-19:23

2 stops27h 53m

£886

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 22/4

13:45-16:45

1 stop19h 00m

Cardiff Wales

Wed 6/5

17:15-11:42

1 stop26h 27m

£887

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 8/8

23:15-09:15

2 stops26h 00m

Cardiff Wales

Sun 16/8

17:15-20:29

2 stops35h 14m

£887

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

15h 00m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 15h 00m
There are no direct flights from Seattle to Cardiff. There are no popular flight routes from Seattle to Cardiff.
Search flight deals

Frequently asked questions about flying from Seattle to Cardiff

  • 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 15h 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.

Frequently asked questions about flying from Seattle to Cardiff

  • 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