YXU - SEA

C$ 334 Find Cheap Flights from London to Seattle – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Seattle departing on 9/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
C$ 490
WestJet
Fri 14/8Sat 22/8
YXU - SEA • 1 stop
Cheapest one-way flights
C$ 334
Multiple Airlines
Wed 9/9
YXU - SEA • 2 stops
Top airlines
WestJet
Cheapest • from C$ 490 (round-trip)
WestJet
Best reviews • 7.2 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
Not available
There are currently no direct flights between London and Seattle. You’ll need at least 1 connection.
Insights
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Insights
Insights
Top layover airports
Calgary (YYC)
Cheapest • Avg C$ 278 (round-trip)
Toronto (YYZ)
Shortest trip • 7h 20m (one-way)
Insights
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from London to Seattle (YXU-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from London to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from London to Seattle

Fri, 14 Aug - Sat, 22 Aug
WestJet Logo
5:55 p.m. - 9:00 p.m.
YXU
-
SEA
30h 05m
1 stop
WestJet Logo
7:00 a.m. - 4:45 p.m.
SEA
-
YXU
6h 45m
1 stop
C$ 490WestJet
Tue, 25 Aug - Thu, 10 Sep
WestJet Logo
8:40 p.m. - 9:40 a.m.
YXU
-
SEA
16h 00m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 499WestJet
Thu, 10 Sep - Thu, 17 Sep
WestJet Logo
5:55 p.m. - 9:40 a.m.
YXU
-
SEA
18h 45m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 500WestJet
Sat, 22 Aug - Sun, 23 Aug
WestJet Logo
6:10 a.m. - 9:00 p.m.
YXU
-
SEA
17h 50m
1 stop
WestJet Logo
7:00 a.m. - 4:45 p.m.
SEA
-
YXU
6h 45m
1 stop
C$ 525WestJet
Thu, 17 Sep - Sat, 19 Sep
WestJet Logo
5:55 p.m. - 9:40 a.m.
YXU
-
SEA
18h 45m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 570WestJet
Thu, 3 Sep - Thu, 10 Sep
WestJet Logo
8:40 p.m. - 9:40 a.m.
YXU
-
SEA
16h 00m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 570WestJet
Sun, 16 Aug - Mon, 24 Aug
WestJet Logo
5:55 p.m. - 6:45 p.m.
YXU
-
SEA
27h 50m
1 stop
WestJet Logo
7:00 a.m. - 1:50 p.m.
SEA
-
YXU
27h 50m
2 stops
C$ 624WestJet
Sat, 17 Oct - Wed, 21 Oct
WestJet Logo
6:10 a.m. - 6:45 p.m.
YXU
-
SEA
15h 35m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 627WestJet
Thu, 10 Sep - Thu, 17 Sep
Multiple Airlines Logo
6:10 a.m. - 6:45 p.m.
YXU
-
SEA
15h 35m
1 stop
Multiple Airlines Logo
8:15 p.m. - 5:20 a.m.
SEA
-
YXU
30h 05m
2 stops
C$ 698Multiple Airlines
Thu, 10 Sep - Thu, 17 Sep
Air Canada Logo
10:05 a.m. - 6:32 p.m.
YXU
-
SEA
11h 27m
2 stops
Air Canada Logo
8:00 a.m. - 5:43 p.m.
SEA
-
YXU
6h 43m
1 stop
C$ 704Air Canada
Booking Insights

KAYAK's insights & trends for London to Seattle flights

Get data-powered insights and trends into flights from London to Seattle to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from London to Seattle?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 5 days.

In the past 5 days, the cheapest round-trip tickets from London to Seattle were found on WestJet (C$ 490) and Air Canada (C$ 704).

Find deals

Good to know

Cheapest flight

C$ 334
Flight from London to Seattle

When to book flights from London to Seattle

Are your dates flexible? Find out the best times to travel from London to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from London to Seattle

  • What is the cheapest flight from London to Seattle?

    In the last 5 days, the lowest price for a flight from London to Seattle was C$ 334 for a one-way ticket and C$ 490 for a round-trip.

  • Which airports will I be using when flying from London to Seattle?

    London airport is called London and the only airport in Seattle is Seattle/Tacoma Intl.

  • Which aircraft models fly most regularly from London to Seattle?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from London to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from London is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to London with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from London to Seattle

 
See real verified KAYAK customer reviews for airlines flying from London to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from London to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.2
WestJetOverall score based on 3416 reviews
7.9Crew
7.0Comfort
7.4Boarding
6.1Entertainment
6.2Food
Airline reviews

The agents at the Kelowna YLW airport were really grumpy. Same with oversized baggage person. Staff on the plane were great.

10.0 ExcellentAnonymous, Mar 2026
YLW - SEA
Read more WestJet reviews

The agents at the Kelowna YLW airport were really grumpy. Same with oversized baggage person. Staff on the plane were great.

Experience was good, the wifi hook up is somewhat tough

I will not be flying with westjet again. I was uncomfortable in my seat. The position made my back hurt so bad. My wife was able to fit the seatbelt around her with out an extension but was unable to put the tray table down or fit in the seat for that matter. Our bag was smashed and I spent two hours trying to fill out the application for a damaged bag before I gave up. The 80 photos I took would not work and nothing telling me the format to upload them as.. I made the mistake of unpacking the bag before taking photos so no claim for me. Next trip to Canada I will have to use air Canada.

They lost my bag. Hopefully it will be here tomorrow.

No dogs! Can we have no dogs in the cabin? Why was there a yappy little dog behind me? Lucky I had ear plugs. Sorry for others without

Arrival at Comox from, London,ON 6 hours later... No bueano

Flight delayed, missed my pick-up had to Uber, plus missed dinner and medication, so sad!

Lost my luggage. Filed a report and there is no response. Received a phone call from another airline that said they had the bag and they did not know what to do with it

I booked through westjet. The first flight left late and cost us the connection to the second flight. The second flight after a 4 hour delay was again late because they were short an attendant. Then a door malfunctioned on the plane which led to yet another plane. So by the time we left Calgary we missed the BC ferry and had to pay a charge to get a later one. It ended up being a 24 hour day. That wrecked our first day and part of the second day in BC because we were so overtired.

Terrible! Delayed three times, landed at some corner of airport, walked in bitter cold night, took a bus, bad experience

Everything you need to know for your flight from London to Seattle

Information on your arrival and departure airports

London (YXU)
Seattle (SEA)