Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Seattle to Cardiff from $278

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 4/14. 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

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize 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 round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
1:50 pm - 4:45 pm
SEA
-
CWL
18h 55m
1 stop
Multiple Airlines Logo
9:45 am - 10:05 pm
CWL
-
SEA
20h 20m
2 stops
$1,088Multiple Airlines
Tue, Jun 23 - Tue, Jun 30
Delta Logo
12:00 pm - 4:45 pm
SEA
-
CWL
20h 45m
2 stops
Delta Logo
9:45 am - 10:05 pm
CWL
-
SEA
20h 20m
2 stops
$1,123Delta
Tue, Jun 23 - Tue, Jun 30
Delta Logo
12:00 pm - 4:45 pm
SEA
-
CWL
20h 45m
2 stops
Delta Logo
9:45 am - 10:05 pm
CWL
-
SEA
20h 20m
2 stops
$1,125Delta
Tue, Jun 23 - Tue, Jun 30
Multiple Airlines Logo
9:05 pm - 7:40 pm
SEA
-
CWL
15h 35m
1 stop
Multiple Airlines Logo
10:25 pm - 7:15 pm
CWL
-
SEA
27h 50m
2 stops
$1,142Multiple Airlines
Fri, Mar 20 - Fri, Mar 27
Air France Logo
1:50 pm - 4:45 pm
SEA
-
CWL
18h 55m
1 stop
Air France Logo
5:15 pm - 4:20 pm
CWL
-
SEA
31h 05m
1 stop
$1,144Air France
Tue, Jun 23 - Tue, Jun 30
WestJet Logo
7:05 am - 10:15 am
SEA
-
CWL
43h 10m
2 stops
WestJet Logo
11:35 am - 8:28 pm
CWL
-
SEA
40h 53m
2 stops
$1,157WestJet
Tue, Jun 23 - Tue, Jun 30
Delta Logo
9:50 am - 4:45 pm
SEA
-
CWL
22h 55m
2 stops
Delta Logo
9:45 am - 4:24 pm
CWL
-
SEA
14h 39m
1 stop
$1,181Delta
Tue, Jun 23 - Tue, Jun 30
Air France Logo
1:50 pm - 4:45 pm
SEA
-
CWL
18h 55m
1 stop
Air France Logo
5:15 pm - 4:20 pm
CWL
-
SEA
31h 05m
1 stop
$1,217Air France
Tue, Jun 23 - Tue, Jun 30
Multiple Airlines Logo
7:20 am - 9:15 am
SEA
-
CWL
17h 55m
2 stops
Multiple Airlines Logo
5:15 pm - 4:20 pm
CWL
-
SEA
31h 05m
1 stop
$1,222Multiple Airlines
Tue, Jun 23 - Tue, Jun 30
Delta Logo
1:50 pm - 4:45 pm
SEA
-
CWL
18h 55m
1 stop
Delta Logo
9:45 am - 4:24 pm
CWL
-
SEA
14h 39m
1 stop
$1,242Delta
Tue, Jun 23 - Tue, Jun 30

Delta flights from Seattle to Cardiff

Our best Delta deals on Seattle to Cardiff flight tickets
Delta
Jun 23
SEA12:00 pmSeattle/Tacoma Intl
20h 45m
2 stops
CWL4:45 pmCardiff Wales
Jun 30
CWL9:45 amCardiff Wales
20h 20m
2 stops
SEA10:05 pmSeattle/Tacoma Intl
$1,123
Delta
Jun 23
SEA12:00 pmSeattle/Tacoma Intl
20h 45m
2 stops
CWL4:45 pmCardiff Wales
Jun 30
CWL9:45 amCardiff Wales
20h 20m
2 stops
SEA10:05 pmSeattle/Tacoma Intl
$1,125
Delta
Jun 23
SEA9:50 amSeattle/Tacoma Intl
22h 55m
2 stops
CWL4:45 pmCardiff Wales
Jun 30
CWL9:45 amCardiff Wales
14h 39m
1 stop
SEA4:24 pmSeattle/Tacoma Intl
$1,181

Air France flights from Seattle to Cardiff

Our best Air France deals on Seattle to Cardiff flight tickets
Air France
Jun 23
SEA1:50 pmSeattle/Tacoma Intl
18h 55m
1 stop
CWL4:45 pmCardiff Wales
Jun 30
CWL5:15 pmCardiff Wales
31h 05m
1 stop
SEA4:20 pmSeattle/Tacoma Intl
$1,144
Air France
Jun 23
SEA1:50 pmSeattle/Tacoma Intl
18h 55m
1 stop
CWL4:45 pmCardiff Wales
Jun 30
CWL5:15 pmCardiff Wales
31h 05m
1 stop
SEA4:20 pmSeattle/Tacoma Intl
$1,217

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated February 4, 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

Tue 6/23

1:50 pm-4:45 pm

1 stop18h 55m

Cardiff Wales

Tue 6/30

9:45 am-10:05 pm

2 stops20h 20m

$1,088

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

12:00 pm-4:45 pm

2 stops20h 45m

Cardiff Wales

Tue 6/30

9:45 am-10:05 pm

2 stops20h 20m

$1,123

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

12:00 pm-4:45 pm

2 stops20h 45m

Cardiff Wales

Tue 6/30

9:45 am-10:05 pm

2 stops20h 20m

$1,125

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 3/20

9:05 pm-7:40 pm

1 stop15h 35m

Cardiff Wales

Fri 3/27

10:25 pm-7:15 pm

2 stops27h 50m

$1,142

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

1:50 pm-4:45 pm

1 stop18h 55m

Cardiff Wales

Tue 6/30

5:15 pm-4:20 pm

1 stop31h 05m

$1,144

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

7:05 am-10:15 am

2 stops43h 10m

Cardiff Wales

Tue 6/30

11:35 am-8:28 pm

2 stops40h 53m

$1,157

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

9:50 am-4:45 pm

2 stops22h 55m

Cardiff Wales

Tue 6/30

9:45 am-4:24 pm

1 stop14h 39m

$1,181

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

1:50 pm-4:45 pm

1 stop18h 55m

Cardiff Wales

Tue 6/30

5:15 pm-4:20 pm

1 stop31h 05m

$1,217

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

7:20 am-9:15 am

2 stops17h 55m

Cardiff Wales

Tue 6/30

5:15 pm-4:20 pm

1 stop31h 05m

$1,222

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

1:50 pm-4:45 pm

1 stop18h 55m

Cardiff Wales

Tue 6/30

9:45 am-4:24 pm

1 stop14h 39m

$1,242

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
1
2

See travel insights to Cardiff from

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 airlines fly to Cardiff?

Aer Lingus, Delta and KLM are the top three most popular airlines that fly to Cardiff from Seattle according to our data. Aer Lingus is the first choice among our users, with 35% of people opting to fly with this airline when traveling to Cardiff. Keep in mind that there are 3 different airlines that fly to Cardiff on a routine basis, so you have a few additional options to choose from.

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

Fastest flight time

15h 35m

Direct flights

None
The fastest flight from Seattle to Cardiff takes 15h 35m
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?

    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 35m.

  • 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?

    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.

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

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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Fri 3/6
Fri 3/13
By creating a price alert you accept our terms of use and privacy policy.

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
Aer Lingus
Delta
KLM