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 many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport?

There is 1 operator available for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport as of July 2025.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Cardiff Wales Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, 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.

$709 Cheap Flights from Seattle to Cardiff in 2025

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Find the cheapest flights from Seattle to Cardiff

Round-trip

One-way

Cheap round-trip flights

2:10 pm - 9:15 amSEA-CWL

35h 05m1 stop

5:35 pm - 11:45 amCWL-SEA

26h 10m1 stop

$1,042KLM

Find Deal

Sat, Sep 13 - Sat, Sep 20

7:45 am - 9:15 amSEA-CWL

17h 30m2 stops

9:45 am - 4:05 pmCWL-SEA

14h 20m1 stop

$1,105

Find Deal

Sat, Sep 13 - Sat, Sep 20

5:40 pm - 9:15 amSEA-CWL

31h 35m1 stop

5:15 pm - 4:05 pmCWL-SEA

30h 50m1 stop

$1,110KLM

Find Deal

Sat, Sep 13 - Fri, Sep 19

5:40 pm - 9:15 amSEA-CWL

31h 35m1 stop

5:15 pm - 11:45 amCWL-SEA

26h 30m1 stop

$1,111KLM

Find Deal

Sat, Sep 13 - Fri, Sep 19

7:45 am - 9:15 amSEA-CWL

17h 30m2 stops

5:15 pm - 4:05 pmCWL-SEA

30h 50m1 stop

$1,179KLM

Find Deal

Sat, Sep 13 - Fri, Sep 19

7:45 am - 9:15 amSEA-CWL

17h 30m2 stops

5:15 pm - 11:45 amCWL-SEA

26h 30m1 stop

$1,180KLM

Find Deal

Sat, Sep 13 - Fri, Sep 19

12:00 pm - 9:15 amSEA-CWL

37h 15m3 stops

5:35 pm - 8:29 pmCWL-SEA

34h 54m3 stops

$1,211

Find Deal

Sat, Sep 13 - Sat, Sep 20

7:45 am - 9:15 amSEA-CWL

17h 30m2 stops

9:50 am - 8:16 pmCWL-SEA

18h 26m2 stops

$1,214

Find Deal

Sat, Sep 13 - Fri, Sep 19

7:45 am - 9:15 amSEA-CWL

17h 30m2 stops

9:50 am - 8:16 pmCWL-SEA

18h 26m2 stops

$1,215

Find Deal

Sat, Sep 13 - Fri, Sep 19

1:40 pm - 4:45 pmSEA-CWL

19h 05m2 stops

9:50 am - 3:55 pmCWL-SEA

14h 05m1 stop

$8,637Air France

Find Deal

Sun, Aug 17 - Fri, Aug 22

KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets

KLM

Sep 13

SEA2:10 pmSeattle/Tacoma Intl

35h 05m

1 stop

CWL9:15 amCardiff Wales

Sep 20

CWL5:35 pmCardiff Wales

26h 10m

1 stop

SEA11:45 amSeattle/Tacoma Intl

$1,042

Find similar

KLM

Sep 13

SEA5:40 pmSeattle/Tacoma Intl

31h 35m

1 stop

CWL9:15 amCardiff Wales

Sep 19

CWL5:15 pmCardiff Wales

30h 50m

1 stop

SEA4:05 pmSeattle/Tacoma Intl

$1,110

Find similar

KLM

Sep 13

SEA5:40 pmSeattle/Tacoma Intl

31h 35m

1 stop

CWL9:15 amCardiff Wales

Sep 19

CWL5:15 pmCardiff Wales

26h 30m

1 stop

SEA11:45 amSeattle/Tacoma Intl

$1,111

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

2:10 pm-9:15 am

1 stop35h 05m

Cardiff Wales

Sat 9/20

5:35 pm-11:45 am

1 stop26h 10m

$1,042

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

7:45 am-9:15 am

2 stops17h 30m

Cardiff Wales

Sat 9/20

9:45 am-4:05 pm

1 stop14h 20m

$1,105

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

5:40 pm-9:15 am

1 stop31h 35m

Cardiff Wales

Fri 9/19

5:15 pm-4:05 pm

1 stop30h 50m

$1,110

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

5:40 pm-9:15 am

1 stop31h 35m

Cardiff Wales

Fri 9/19

5:15 pm-11:45 am

1 stop26h 30m

$1,111

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

7:45 am-9:15 am

2 stops17h 30m

Cardiff Wales

Fri 9/19

5:15 pm-4:05 pm

1 stop30h 50m

$1,179

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

7:45 am-9:15 am

2 stops17h 30m

Cardiff Wales

Fri 9/19

5:15 pm-11:45 am

1 stop26h 30m

$1,180

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

12:00 pm-9:15 am

3 stops37h 15m

Cardiff Wales

Sat 9/20

5:35 pm-8:29 pm

3 stops34h 54m

$1,211

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

7:45 am-9:15 am

2 stops17h 30m

Cardiff Wales

Fri 9/19

9:50 am-8:16 pm

2 stops18h 26m

$1,214

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

7:45 am-9:15 am

2 stops17h 30m

Cardiff Wales

Fri 9/19

9:50 am-8:16 pm

2 stops18h 26m

$1,215

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 8/17

1:40 pm-4:45 pm

2 stops19h 05m

Cardiff Wales

Fri 8/22

9:50 am-3:55 pm

1 stop14h 05m

$8,637

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 day to depart on your flight to Cardiff?

The cheapest day to depart on your flight to Cardiff is on a Wednesday when prices can be found for as low as $808. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $1,303. These prices are subject to change though, so be sure to set up a Price Alert for flights to Cardiff.

What is the cheapest time of day to depart on your flight to Cardiff?

Flying to Cardiff from Seattle in the morning is the least expensive time of day to depart. momondo users have found prices as low as $941 when looking at flights departing in the morning. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,132 on average. Flights to Cardiff from Seattle in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 round-trip 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

Best Price Found	$1,042
Fastest flight time	15h 05m
Direct flights	None
Airports in Cardiff	1 airport

The best flight deal from Seattle to Cardiff found on momondo in the last 72 hours is $1,042

The fastest flight from Seattle to Cardiff takes 15h 05m

There are no direct flights from Seattle to Cardiff. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - Cardiff Wales Airport.

There is 1 airport near Cardiff: Cardiff Wales (CWL)

Search flight deals

How far is Seattle/Tacoma Intl to Cardiff Wales by plane?
The straight-line distance from Seattle/Tacoma Intl to Cardiff Wales is 4700.6 mi. In terms of flight time, this usually takes a little over 15h 05m.
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 many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport?
There is 1 operator available for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport as of July 2025.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Cardiff Wales Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, 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.
What is the most popular airline from Seattle to Cardiff?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Seattle to Cardiff is KLM (100% of total bookings).

Best airlines flying from Seattle to Cardiff

Compare and see reviews for airlines that fly from Seattle to Cardiff with momondo

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $760	Free Cancellation	Rating 7.8 1,383 reviews		Search KLM flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Cardiff?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Cardiff. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Seattle to Cardiff with flexible booking policies on momondo?

momondo does allow users to show only those flights to Cardiff from Seattle which offer a flexible booking policy as well as other useful filters and features.

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?

If you are simply researching potential flights to Cardiff, momondo offers a useful price alert feature which will track prices for flights to Cardiff from Seattle and alert you when they change.