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 November 2026.

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.

$807 Cheap Flights from Seattle to Cardiff in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Cardiff

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:35 pm - 5:00 pmSEA Seattle/Tacoma Intl-CWL Cardiff Wales

18h 25m1 stop Amsterdam Schiphol

5:30 pm - 12:35 pmCWL Cardiff Wales-SEA Seattle/Tacoma Intl

26h 05m1 stop Amsterdam Schiphol

$1,027KLM

Mon, Mar 8 - Mon, Mar 15

7:15 am - 9:50 amSEA Seattle/Tacoma Intl-CWL Cardiff Wales

18h 35m2 stops New York John F Kennedy Intl Amsterdam Schiphol

5:30 pm - 12:35 pmCWL Cardiff Wales-SEA Seattle/Tacoma Intl

26h 05m1 stop Amsterdam Schiphol

$1,031KLM

Mon, Mar 8 - Mon, Mar 15

6:00 am - 9:50 amSEA Seattle/Tacoma Intl-CWL Cardiff Wales

19h 50m2 stops Detroit Metropolitan Wayne County Amsterdam Schiphol

10:20 am - 4:53 pmCWL Cardiff Wales-SEA Seattle/Tacoma Intl

37h 33m2 stops Amsterdam Schiphol Salt Lake City

$1,041Delta

Mon, Mar 8 - Mon, Mar 15

2:35 pm - 5:00 pmSEA Seattle/Tacoma Intl-CWL Cardiff Wales

18h 25m1 stop Amsterdam Schiphol

5:30 pm - 11:50 amCWL Cardiff Wales-SEA Seattle/Tacoma Intl

26h 20m1 stop Amsterdam Schiphol

$1,311KLM

Mon, Nov 23 - Mon, Nov 30

2:35 pm - 5:00 pmSEA Seattle/Tacoma Intl-CWL Cardiff Wales

18h 25m1 stop Amsterdam Schiphol

5:30 pm - 11:50 amCWL Cardiff Wales-SEA Seattle/Tacoma Intl

26h 20m1 stop Amsterdam Schiphol

$1,314KLM

Mon, Nov 23 - Mon, Nov 30

8:25 am - 9:45 amSEA Seattle/Tacoma Intl-CWL Cardiff Wales

17h 20m2 stops Atlanta Hartsfield-Jackson Amsterdam Schiphol

5:30 pm - 11:50 amCWL Cardiff Wales-SEA Seattle/Tacoma Intl

26h 20m1 stop Amsterdam Schiphol

$1,316KLM

Mon, Nov 23 - Mon, Nov 30

6:00 am - 9:45 amSEA Seattle/Tacoma Intl-CWL Cardiff Wales

19h 45m2 stops Atlanta Hartsfield-Jackson Amsterdam Schiphol

5:30 pm - 11:50 amCWL Cardiff Wales-SEA Seattle/Tacoma Intl

26h 20m1 stop Amsterdam Schiphol

$1,318KLM

Mon, Nov 23 - Mon, Nov 30

2:35 pm - 11:35 pmSEA Seattle/Tacoma Intl-CWL Cardiff Wales

25h 00m3 stops Reykjavik Keflavik Intl Edinburgh Turnhouse Granadilla Tenerife-Sur

8:35 am - 6:00 pmCWL Cardiff Wales-SEA Seattle/Tacoma Intl

40h 25m3 stops Dublin London Heathrow Reykjavik Keflavik Intl

$1,321Multiple Airlines

Mon, Mar 8 - Mon, Mar 15

6:45 pm - 11:45 amSEA Seattle/Tacoma Intl-CWL Cardiff Wales

33h 00m2 stops London Heathrow Belfast City

8:35 am - 6:00 pmCWL Cardiff Wales-SEA Seattle/Tacoma Intl

40h 25m3 stops Dublin London Heathrow Reykjavik Keflavik Intl

$1,324Multiple Airlines

Mon, Mar 8 - Mon, Mar 15

2:35 pm - 5:00 pmSEA Seattle/Tacoma Intl-CWL Cardiff Wales

18h 25m1 stop Amsterdam Schiphol

5:30 pm - 11:50 amCWL Cardiff Wales-SEA Seattle/Tacoma Intl

26h 20m1 stop Amsterdam Schiphol

$1,459Multiple Airlines

Fri, Dec 18 - Fri, Dec 25

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KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets

KLM

Mar 8

SEA2:35 pmSeattle/Tacoma Intl

18h 25m

1 stop

CWL5:00 pmCardiff Wales

Mar 15

CWL5:30 pmCardiff Wales

26h 05m

1 stop

SEA12:35 pmSeattle/Tacoma Intl

$1,027

KLM

Mar 8

SEA7:15 amSeattle/Tacoma Intl

18h 35m

2 stops

CWL9:50 amCardiff Wales

Mar 15

CWL5:30 pmCardiff Wales

26h 05m

1 stop

SEA12:35 pmSeattle/Tacoma Intl

$1,031

KLM

Nov 23

SEA2:35 pmSeattle/Tacoma Intl

18h 25m

1 stop

CWL5:00 pmCardiff Wales

Nov 30

CWL5:30 pmCardiff Wales

26h 20m

1 stop

SEA11:50 amSeattle/Tacoma Intl

$1,311

Virgin Atlantic flights from Seattle to Cardiff

Our best Virgin Atlantic deals on Seattle to Cardiff flight tickets

Virgin Atlantic

Dec 18

SEA8:30 amSeattle/Tacoma Intl

17h 20m

2 stops

CWL9:50 amCardiff Wales

Dec 25

CWL10:20 amCardiff Wales

39h 58m

2 stops

SEA6:18 pmSeattle/Tacoma Intl

$1,839

Virgin Atlantic

Dec 18

SEA10:55 pmSeattle/Tacoma Intl

34h 05m

2 stops

CWL5:00 pmCardiff Wales

Dec 25

CWL10:20 amCardiff Wales

33h 30m

1 stop

SEA11:50 amSeattle/Tacoma Intl

$1,913

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Mon 3/8

2:35 pm-5:00 pm

1 stop18h 25m

Cardiff Wales

Mon 3/15

5:30 pm-12:35 pm

1 stop26h 05m

$1,027

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Mon 3/8

7:15 am-9:50 am

2 stops18h 35m

Cardiff Wales

Mon 3/15

5:30 pm-12:35 pm

1 stop26h 05m

$1,031

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Mon 3/8

6:00 am-9:50 am

2 stops19h 50m

Cardiff Wales

Mon 3/15

10:20 am-4:53 pm

2 stops37h 33m

$1,041

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Mon 11/23

2:35 pm-5:00 pm

1 stop18h 25m

Cardiff Wales

Mon 11/30

5:30 pm-11:50 am

1 stop26h 20m

$1,311

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Mon 11/23

2:35 pm-5:00 pm

1 stop18h 25m

Cardiff Wales

Mon 11/30

5:30 pm-11:50 am

1 stop26h 20m

$1,314

Quickest round-trip

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Mon 11/23

8:25 am-9:45 am

2 stops17h 20m

Cardiff Wales

Mon 11/30

5:30 pm-11:50 am

1 stop26h 20m

$1,316

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Mon 11/23

6:00 am-9:45 am

2 stops19h 45m

Cardiff Wales

Mon 11/30

5:30 pm-11:50 am

1 stop26h 20m

$1,318

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Mon 3/8

2:35 pm-11:35 pm

3 stops25h 00m

Cardiff Wales

Mon 3/15

8:35 am-6:00 pm

3 stops40h 25m

$1,321

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Mon 3/8

6:45 pm-11:45 am

2 stops33h 00m

Cardiff Wales

Mon 3/15

8:35 am-6:00 pm

3 stops40h 25m

$1,324

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Fri 12/18

2:35 pm-5:00 pm

1 stop18h 25m

Cardiff Wales

Fri 12/25

5:30 pm-11:50 am

1 stop26h 20m

$1,459

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted 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 airline that flies from Seattle/Tacoma Intl to Cardiff Wales?

KLM 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 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	$807
Fastest flight time	18h 25m
Direct flights	None

The best one-way flight to Cardiff from Seattle in the past 72 hours is $807. The best round-trip flight deal from Seattle to Cardiff found on momondo in the last 72 hours is $1,027.

The fastest flight from Seattle to Cardiff takes 18h 25m

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?
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 18h 25m.
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 November 2026.
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 Delta (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
Delta	PriceFrom $1,519	Free Cancellation	Rating 7.8 8,697 reviews		Search Delta flights

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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.

An easier way to manage your Cardiff trip

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Delta

Cheap flights from Seattle to Cardiff from $807

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 12/17. 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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KLM flights from Seattle to Cardiff

Our best KLM deals on Seattle to Cardiff flight tickets

Virgin Atlantic flights from Seattle to Cardiff

Our best Virgin Atlantic deals on Seattle to Cardiff flight tickets

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How to get the cheapest flight ticket from Seattle to Cardiff

What is the cheapest airline that flies from Seattle/Tacoma Intl to Cardiff Wales?

When to book flights from Seattle to Cardiff

Cheap Seattle to Cardiff (SEA to CWL) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Seattle to Cardiff

Best airlines flying from Seattle to Cardiff

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

Traveling to a place near Cardiff?

Why use momondo?

An easier way to manage your Cardiff trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United Kingdom

Fly your favorite airline to Cardiff

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Cardiff

List of cabin classes available on flights landing in Cardiff. Availability may vary depending on flight origin and airline.

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo

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