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C$573 Cheap Flights from Cardiff (CWL) to Seattle (SEAA)

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Flight deals from Cardiff Airport to Seattle

Looking for a cheap last-minute deal or the best return flight from Cardiff Airport to Seattle? If you want to travel next month, return fares start from C$1,209. Find the lowest prices on one-way and return tickets right here.
Seattle.C$573 per passenger.Departing Thu., Apr. 30.One-way flight with Ryanair.Outbound indirect flight with Ryanair, departs from Cardiff on Thu., Apr. 30, arriving in Seattle / Tacoma International.Price includes taxes and charges.From C$573, select.
Seattle.C$620 per passenger.Departing Fri., May 1.One-way flight with Ryanair.Outbound indirect flight with Ryanair, departs from Cardiff on Fri., May 1, arriving in Seattle / Tacoma International.Price includes taxes and charges.From C$620, select.
Seattle.C$815 per passenger.Departing Tue., Sep. 1.One-way flight with Ryanair.Outbound indirect flight with Ryanair, departs from Cardiff on Tue., Sep. 1, arriving in Seattle / Tacoma International.Price includes taxes and charges.From C$815, select.
Seattle.C$893 per passenger.Departing Tue., Dec. 1.One-way flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from Cardiff on Tue., Dec. 1, arriving in Seattle / Tacoma International.Price includes taxes and charges.From C$893, select.
Seattle.C$1,059 per passenger.Departing Fri., Oct. 30.One-way flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from Cardiff on Fri., Oct. 30, arriving in Seattle / Tacoma International.Price includes taxes and charges.From C$1,059, select.

Find the cheapest month to fly from Cardiff to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Cardiff to Seattle flights are currently cheapest in April.
Apr.
from C$575
May
from C$623
Jun.
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Jul.
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Aug.
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Sep.
from C$818
Oct.
from C$1,064
Nov.
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Dec.
from C$897
Jan.
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Feb.
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Mar.
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Alternative Cardiff to Seattle routes

Looking for the cheapest, fastest or easiest route from Cardiff to Seattle? You could fly into the following airports instead.

Seattle Lake Union SPB

2km from central Seattle
Closest
from C$861
Search flights

Seattle Boeing Fld

11km from central Seattle
from C$1,401
Search flights

Seattle / Tacoma International

20km from central Seattle
Cheapest
from C$575
Search flights

Paine Field

33km from central Seattle
from C$977
Search flights

Cardiff to Seattle: Flight information

The things to know before you go.
Cheapest flight foundC$575
Cheapest month to flyApril

Finding cheap flights from Cardiff to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from Cardiff to Seattle is C$1,112. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Cardiff to Seattle. But we found flights with one or more stops from C$1,117.
As of April 2026, there are no flights flying from Cardiff to Seattle.
The cheapest month to fly from Cardiff to Seattle is usually April.
If you're flying from Cardiff Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from C$1,112.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Cardiff Airport to Seattle on Thursday, April 30, 2026.
No airlines currently offer direct flights between Cardiff Airport and Seattle. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In April, the average temperature is usually around 8°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
Currently, Ryanair offers the cheapest flight tickets to Seattle.

Flying from Cardiff Airport (CWL) to Seattle: what you need to know

  • Cardiff Airport is located in Cardiff. Operating on the UTC-7 timezone, Seattle is 7 hours behind Cardiff.

  • Give yourself plenty of time to get on your flight from CWL to Seattle. It's generally best to arrive two hours before international departures and an hour ahead for domestic flights.

  • During popular months such as June, it's wise to get to the airport earlier. Plan to arrive two hours before a domestic departure and four hours ahead of international flights when you fly during peak periods in general.

  • We make it easy to book a flight from CWL to Seattle with a stopover. To see all the options, deselect 'Direct flights only.' Next, choose a flight with a stop long enough to see the sights of your chosen city. Top stopovers include:

    • Keflavik International Airport (KEF)

    • Amsterdam Airport Schiphol Airport (AMS)

    • Dublin Airport (DUB)

  • You will need an ETA for United States if you have a passport from United Kingdom and are visiting for tourism purposes. Visa and travel documentation requirements can be subject to change. So before booking your cheap ticket from Cardiff Airport to Seattle, check with your airline and the destination country's local consulate or embassy for the most recent updates.

  • Travelling from central Cardiff to CWL takes approximately 1 hour and 6 minutes on public transport. If you drive, ride-share or get a cab, you'll cover the 27 kilometres in 31 minutes or so, depending on traffic conditions.

  • Planning to catch an early flight from Cardiff Airport to Seattle? Avoid the stress of rushing to the terminal (and get some extra shut-eye) by picking one of these hotels close to CWL:

How to find the cheapest flights from Cardiff Airport (CWL) to Seattle

  • The best price we've found for a one-way ticket from Cardiff Airport to Seattle is C$573. The cheapest price for a return flight is C$1,117. Remember fares can change due to availability at the time of booking.

  • It's a good idea to book as early as possible if you're looking for cheap tickets from CWL to Seattle. That's because airlines adjust prices based on demand, which tends to increase closer to departure.

  • The 'Whole month' search tool shows you the cheapest tickets from Cardiff Airport to Seattle throughout the month. It's the best way to find a bargain if your plans aren't set in stone.

  • Create a Price Alert for cheap tickets from CWL to Seattle. There's no need to check back in every day to see if prices have fallen. We'll tell you as soon as the price changes.

  • Make the most of the filters to find your ideal trip. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Cardiff Airport to Seattle, use the 'Sort by' function. You can also filter by departure and arrival times, airline, and journey duration.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) to the centre of Seattle takes about 18 minutes by car. It's approximately 23 kilometres away.

  • If you're taking public transport, expect a journey time of about 54 minutes.

  • The last thing you need is a lengthy journey to your hotel if you're arriving on a late flight from Cardiff Airport to Seattle. Stay at one of these accommodation options near SEA instead:

Lake Union Sea Plane Base Airport (LKE)

Best time to go to Seattle

  • July is the most popular month to board a flight from Cardiff Airport to Seattle while May is the quietest. To work out the best time to visit Seattle, consider the pace you like to travel at.

  • Lock in your flight from Cardiff Airport to Seattle for August to experience the city during its warmest month. Expect temperatures to range from 12ºC to 28ºC.

  • February has average temperatures of between -1ºC and 11ºC. Search for cheap flights from CWL to Seattle sometime then if you like travelling in cooler conditions.

More about Seattle

  • When it comes to looking for somewhere to lay your head, you'll find the best stays in Seattle right here. Explore these options once you've locked in your flight from Cardiff Airport to Seattle:

  • Gas Works - Lake View Point and Queen Anne Bowl Playfield are just a couple of the top attractions to add to your Seattle must-do list. Keep the momentum going by heading to LMN Architects.

Complete your Seattle trip with a car rental

  • Choose one of our car rentals in Seattle and see the sights at your own pace. Easily compare rates in one go to find your perfect ride once you've booked your hotel and cheap flights from Cardiff Airport to Seattle.

Plan the rest of your trip from Cardiff to Seattle

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.