HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Cardiff

$778+ Cheap flights from Seattle (SEA) to Cardiff (CWL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CWL
Feb 11 — Feb 181
Wed 2/11
Wed 2/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Cardiff with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Seattle to Cardiff

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Cardiff (CWL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Ovago
2 stars

Round-trip from

$778
(Delta)
Provider with most accurate pricing for Seattle/Tacoma Intl-Cardiff Wales flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Cardiff Wales flights.
Search Deals
From Seattle/Tacoma Intl to Cardiff Wales
Search Deals

Find flight deals from Seattle to Cardiff

Cheapest flights from Seattle to Cardiff
Explore the most affordable flight options available from Seattle to Cardiff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 12, 2026.

This Delta deal was found by Cheapflights users on 1/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/218:30 amSEA - CWL
2 stops24h 20mDelta
Sat 2/2810:20 amCWL - SEA
2 stops20h 02mDelta
Deal found 1/9$778
This KLM deal was found by Cheapflights users on 1/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/213:05 pmSEA - CWL
1 stop34h 45mKLM
Sat 2/285:25 pmCWL - SEA
1 stop26h 10mKLM
Deal found 1/9$864
This WestJet deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/237:05 amSEA - CWL
2 stops43h 10mWestJet
Tue 6/3011:35 amCWL - SEA
2 stops40h 53mWestJet
Deal found 1/10$1,086
This Ovago deal was found by Cheapflights users on 1/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/254:00 pmSEA - CWL
1 stop17h 55mAir Europa
Fri 3/2710:20 amCWL - SEA
2 stops40h 28mAir Europa
Deal found 1/9$1,230
This KLM deal was found by Cheapflights users on 1/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/21:50 pmSEA - CWL
1 stop18h 55mKLM
Thu 6/49:45 amCWL - SEA
2 stops18h 44mKLM
Deal found 1/8$1,275
This KLM deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/235:35 pmSEA - CWL
1 stop15h 10mKLM
Tue 6/305:15 pmCWL - SEA
1 stop31h 05mKLM
Deal found 1/10$1,336
This KLM deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/235:35 pmSEA - CWL
1 stop15h 10mMultiple Airlines
Tue 6/309:45 amCWL - SEA
2 stops20h 20mMultiple Airlines
Deal found 1/10$1,346
This Delta deal was found by Cheapflights users on 1/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/235:35 pmSEA - CWL
1 stop15h 10mDelta
Tue 6/309:45 amCWL - SEA
2 stops20h 20mDelta
Deal found 1/9$1,347

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated January 12, 2026.
Use the filters below to find and compare flights from Seattle to Cardiff that are best for you.

Fly from

Seattle

Fly to

Cardiff

Route

Depart

Return

Price

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 7/8

5:35 pm-9:15 am

1 stop31h 40m

Cardiff Wales

Thu 7/23

9:45 am-11:33 am

1 stop33h 48m

$1,009

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 7/8

5:35 pm-9:15 am

1 stop31h 40m

Cardiff Wales

Mon 7/27

9:45 am-11:33 am

1 stop33h 48m

$1,009

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 7/7

1:45 pm-4:45 pm

1 stop19h 00m

Cardiff Wales

Thu 7/23

9:45 am-11:33 am

1 stop33h 48m

$1,009

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 7/7

1:45 pm-4:45 pm

1 stop19h 00m

Cardiff Wales

Mon 7/27

9:45 am-11:33 am

1 stop33h 48m

$1,009

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 7/7

11:15 am-4:45 pm

2 stops21h 30m

Cardiff Wales

Wed 7/22

9:45 am-11:33 am

1 stop33h 48m

$1,014

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 7/7

11:15 am-4:45 pm

2 stops21h 30m

Cardiff Wales

Tue 7/28

9:45 am-4:20 pm

1 stop14h 35m

$1,014

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 7/8

5:35 pm-9:15 am

1 stop31h 40m

Cardiff Wales

Wed 7/22

9:45 am-10:05 pm

2 stops20h 20m

$1,019

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 7/6

9:55 pm-4:45 pm

2 stops34h 50m

Cardiff Wales

Tue 7/28

9:45 am-4:20 pm

1 stop14h 35m

$1,026

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/11

Compare providers for flights from Seattle to Cardiff

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Cardiff in January.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
OvagoPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Cardiff flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Cardiff flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Cardiff flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Cardiff flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Cardiff flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Cardiff

Have a flexible travel schedule? Discover the best time to fly to Cardiff from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Cardiff. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Cardiff?

    Departing from Seattle to Cardiff will take you 31h 40m. There are 4709 mi between Seattle and Cardiff.

  • Can I find deals for flights from Seattle to Cardiff that include hotel bookings?

    Yes. In addition to deals on Seattle to Cardiff flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Cardiff?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Cardiff.

  • Can I find deals for business class flights from Seattle to Cardiff?

    Yes. Cheapflights offers flight deals from Seattle to Cardiff by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Cardiff?

Book flights to Cardiff if you plan to visit one of these locations
Bridgend

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Cardiff

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Manchester flights
Portland to Manchester flights
Spokane to Manchester flights
Portland to Bristol flights
Seattle to Bristol flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.