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Cheap flights from Seattle to Cardiff from $924

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Cardiff departing on 4/30. 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

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Find the cheapest flights from Seattle to Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
5:35 pm - 9:15 amSEA-CWL
31h 40m1 stop
Delta Logo
9:50 am - 11:35 amCWL-SEA
33h 45m1 stop
$924Delta
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qui, abr 30 - seg, mai 4
Delta Logo
11:50 am - 4:45 pmSEA-CWL
20h 55m2 stops
Delta Logo
9:50 am - 11:35 amCWL-SEA
33h 45m1 stop
$929Delta
Find Deal
qui, abr 30 - seg, mai 4
Delta Logo
5:35 pm - 9:15 amSEA-CWL
31h 40m1 stop
Delta Logo
9:50 am - 7:33 pmCWL-SEA
41h 43m2 stops
$934Delta
Find Deal
qui, abr 30 - seg, mai 4
Virgin Atlantic Logo
3:35 pm - 4:45 pmSEA-CWL
17h 10m2 stops
Virgin Atlantic Logo
9:50 am - 4:18 pmCWL-SEA
38h 28m2 stops
$939Virgin Atlantic
Find Deal
qui, abr 30 - seg, mai 4

Delta flights from Seattle to Cardiff

Our best Delta deals on Seattle to Cardiff flight tickets
Delta
Apr 30
SEA5:35 pmSeattle/Tacoma Intl
31h 40m
1 stop
CWL9:15 amCardiff Wales
May 4
CWL9:50 amCardiff Wales
33h 45m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$924
Find similar
Delta
Apr 30
SEA11:50 amSeattle/Tacoma Intl
20h 55m
2 stops
CWL4:45 pmCardiff Wales
May 4
CWL9:50 amCardiff Wales
33h 45m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$929
Find similar
Delta
Apr 30
SEA5:35 pmSeattle/Tacoma Intl
31h 40m
1 stop
CWL9:15 amCardiff Wales
May 4
CWL9:50 amCardiff Wales
41h 43m
2 stops
SEA7:33 pmSeattle/Tacoma Intl
$934
Find similar

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 novembro 4, 2025.
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

qui 4/30

5:35 pm-9:15 am

1 stop31h 40m

Cardiff Wales

seg 5/4

9:50 am-11:35 am

1 stop33h 45m

$924

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

qui 4/30

11:50 am-4:45 pm

2 stops20h 55m

Cardiff Wales

seg 5/4

9:50 am-11:35 am

1 stop33h 45m

$929

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

qui 4/30

5:35 pm-9:15 am

1 stop31h 40m

Cardiff Wales

seg 5/4

9:50 am-7:33 pm

2 stops41h 43m

$934

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

qui 4/30

3:35 pm-4:45 pm

2 stops17h 10m

Cardiff Wales

seg 5/4

9:50 am-4:18 pm

2 stops38h 28m

$939

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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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

Direct flights

None
There are no direct flights from Seattle to Cardiff. There are no popular flight routes from Seattle to Cardiff.
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  • 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 17h 10m.

  • 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

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1 adult
qui 12/4
qui 12/11
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