How long is the flight from Seattle to Cardiff?

Departing from Seattle to Cardiff will take you 18h 30m. There are 4709 mi between Seattle and Cardiff. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

In terms of precipitation, rainfall in Cardiff ranges from 2.0 - 3.5 inches per month. January is typically the wettest month, when rainfall can reach 3.5 in. April is typically the driest time to visit Cardiff when rainfall is around 2.0 in.

If weather is an important factor for your trip to Cardiff, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 64.4 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 39.2 F).

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 FlightHub the most. FlightHub 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.

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.

$354+ Cheap Flights from Seattle to Cardiff

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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.

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 October 16, 2025.

Sat 11/293:00 pmSEA - CWL

1 stop34h 50mKLM

Sat 12/65:25 pmCWL - SEA

1 stop26h 25mKLM

Deal found 10/15

$903

Sat 11/297:20 amSEA - CWL

2 stops18h 30mDelta

Sat 12/610:20 amCWL - SEA

2 stops20h 03mDelta

Deal found 10/15

$918

Sat 11/292:35 pmSEA - CWL

2 stops22h 20mMultiple Airlines

Sat 12/68:05 pmCWL - SEA

3 stops34h 11mMultiple Airlines

Deal found 10/15

$1,245

Best flights from Seattle to Cardiff
Discover carefully curated flight deals from Seattle to Cardiff that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 16, 2025.

Sat 11/293:00 pmSEA - CWL

1 stop34h 50mKLM

Sat 12/65:25 pmCWL - SEA

1 stop26h 25mKLM

Deal found 10/15

$903

Sat 11/297:20 amSEA - CWL

2 stops18h 30mDelta

Sat 12/610:20 amCWL - SEA

2 stops20h 03mDelta

Deal found 10/15

$918

Sat 11/2910:05 amSEA - CWL

3 stops26h 50mMultiple Airlines

Sat 12/68:05 pmCWL - SEA

3 stops34h 11mMultiple Airlines

Deal found 10/15

$1,265

Last-minute flights from Seattle to Cardiff
Discover last-minute flight deals from Seattle to Cardiff. Data last updated October 16, 2025 and is based on user searches.

Sat 11/293:00 pmSEA - CWL

1 stop34h 50mKLM

Sat 12/65:25 pmCWL - SEA

1 stop26h 25mKLM

Deal found 10/15

$903

Sat 11/297:20 amSEA - CWL

2 stops18h 30mDelta

Sat 12/610:20 amCWL - SEA

2 stops20h 03mDelta

Deal found 10/15

$918

Sat 11/292:35 pmSEA - CWL

2 stops22h 20mMultiple Airlines

Sat 12/68:05 pmCWL - SEA

3 stops34h 11mMultiple Airlines

Deal found 10/15

$1,245

One-way flights from Seattle to Cardiff
Search for one-way flight options from Seattle to Cardiff. Find affordable one-way fares based on user searches. Data last updated October 16, 2025.

Sat 11/1511:34 pmSEA - CWL

3 stops39h 31mMultiple Airlines

Deal found 10/15

$354

Sun 11/168:01 amSEA - CWL

3 stops31h 04mMultiple Airlines

Deal found 10/15

$359

Mon 11/1011:34 pmSEA - CWL

3 stops31h 56mMultiple Airlines

Deal found 10/15

$372

Tue 11/117:00 amSEA - CWL

2 stops24h 30mMultiple Airlines

Deal found 10/15

$373

Wed 11/129:34 pmSEA - CWL

3 stops40h 26mMultiple Airlines

Deal found 10/15

$393

Thu 11/136:15 pmSEA - CWL

3 stops41h 25mMultiple Airlines

Deal found 10/15

$402

Fri 11/148:01 amSEA - CWL

2 stops27h 39mMultiple Airlines

Deal found 10/15

$451

Cheap flight deals from Seattle to Cardiff

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$903 (Air France)
One-way from	$354 (Kiwi.com)

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

One-way flight from Seattle/Tacoma Intl to Cardiff Wales

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 11/29

3:00 pm-9:50 am

1 stop34h 50m

Cardiff Wales

Sat 12/6

5:25 pm-11:50 am

1 stop26h 25m

$903

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 11/29

7:20 am-9:50 am

2 stops18h 30m

Cardiff Wales

Sat 12/6

10:20 am-10:23 pm

2 stops20h 03m

$918

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 11/29

10:05 am-8:55 pm

3 stops26h 50m

Cardiff Wales

Sat 12/6

8:05 pm-10:16 pm

3 stops34h 11m

$1,265

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 11/15

11:34 pm-11:05 pm

3 stops39h 31m

$354

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sun 11/16

8:01 am-11:05 pm

3 stops31h 04m

$359

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 11/11

7:00 am-3:30 pm

2 stops24h 30m

$373

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 11/12

7:00 am-10:05 am

2 stops19h 05m

$373

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 11/13

6:15 pm-7:40 pm

3 stops41h 25m

$402

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 11/14

11:07 am-6:00 pm

3 stops46h 53m

$453

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 11/10

2:00 pm-3:30 pm

2 stops41h 30m

$484

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/15

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 FlightHub the most. FlightHub 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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Cardiff

What is the cheapest time of day to fly from SEA to CWL?

When flying from Seattle to Cardiff, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 42% versus a flight in the evening.

Related info for your journey

How long is the flight from Seattle to Cardiff?
Departing from Seattle to Cardiff will take you 18h 30m. There are 4709 mi between Seattle and Cardiff. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Seattle to Cardiff

Portland to Manchester flights

Seattle 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.

$354+ Cheap flights from Seattle (SEA) to Cardiff (CWL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/15. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Seattle to Cardiff with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Find flight deals from Seattle to Cardiff

Cheapest flights from Seattle to CardiffExplore 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 October 16, 2025.

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 October 16, 2025.

Cheap flight deals from Seattle to Cardiff

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Cardiff that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Cardiff

What is the cheapest time of day to fly from SEA to CWL?

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?

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

How can I find direct flights from Seattle to Cardiff?

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

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.

100% Free

Book with Flexibility

Travel Smart

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 October 16, 2025.