YXU - SEA

C$ 321 Find Cheap Flights from London to Seattle

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 12/12. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, as well as popular online travel agencies
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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

Thu, 11 Dec - Thu, 18 Dec
WestJet Logo
8:10 p.m. - 2:20 p.m.YXU-SEA
21h 10m1 stop
WestJet Logo
3:10 p.m. - 6:34 a.m.SEA-YXU
12h 24m1 stop
C$ 824WestJet
Find Deal
Thu, 11 Dec - Thu, 18 Dec
WestJet Logo
8:10 p.m. - 10:22 a.m.YXU-SEA
17h 12m2 stops
WestJet Logo
3:10 p.m. - 6:34 a.m.SEA-YXU
12h 24m1 stop
C$ 862WestJet
Find Deal
Mon, 10 Nov - Fri, 14 Nov
United Airlines Logo
5:40 p.m. - 10:16 p.m.YXU-SEA
7h 36m1 stop
United Airlines Logo
7:13 p.m. - 5:05 p.m.SEA-YXU
18h 52m2 stops
C$ 1,019United Airlines
Find Deal
Mon, 10 Nov - Fri, 14 Nov
United Airlines Logo
5:40 p.m. - 9:50 a.m.YXU-SEA
19h 10m2 stops
United Airlines Logo
11:50 p.m. - 5:05 p.m.SEA-YXU
14h 15m2 stops
C$ 1,027United Airlines
Find Deal
Thu, 11 Dec - Thu, 18 Dec
WestJet Logo
8:10 p.m. - 8:50 p.m.YXU-SEA
27h 40m2 stops
WestJet Logo
9:32 a.m. - 6:34 a.m.SEA-YXU
18h 02m2 stops
C$ 1,058WestJet
Find Deal
Thu, 11 Dec - Thu, 18 Dec
United Airlines Logo
9:25 a.m. - 10:28 p.m.YXU-SEA
16h 03m2 stops
United Airlines Logo
12:35 p.m. - 5:05 p.m.SEA-YXU
25h 30m3 stops
C$ 1,087United Airlines
Find Deal
Mon, 10 Nov - Fri, 14 Nov
Air Canada Logo
5:40 p.m. - 10:16 p.m.YXU-SEA
7h 36m1 stop
Air Canada Logo
8:10 a.m. - 9:21 p.m.SEA-YXU
10h 11m1 stop
C$ 1,238Air Canada
Find Deal
Mon, 10 Nov - Fri, 14 Nov
United Airlines Logo
5:15 a.m. - 6:10 p.m.YXU-SEA
15h 55m3 stops
United Airlines Logo
11:59 p.m. - 5:05 p.m.SEA-YXU
14h 06m2 stops
C$ 1,427United Airlines
Find Deal

Everything you should know

Top airlines
WestJet
Cheapest • from C$ 824 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
C$ 824
WestJet
Thu 11/12Thu 18/12
YXU - SEA • 1 stop
Cheapest one-way flights
C$ 321
Multiple Airlines
Fri 12/12
YXU - SEA • 2 stops
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KAYAK searches hundreds of sites at once to find you the best travel deals.
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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 72 hours.

In the past 3 days, the cheapest round-trip tickets from London to Seattle were found on WestJet (C$ 824) and United Airlines (C$ 1,019).

Which airlines fly direct between London and Seattle?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from London to Seattle.

There are 3 airlines that fly direc from London to Seattle. They are: Air Canada, United Airlines and WestJet. The cheapest price of all airlines flying this route was found with WestJet at C$ 243 for a round-trip flight. On average, the best prices for this route can be found at United Airlines.

Good to know

Cheapest flightC$ 321
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 3 days, the lowest price for a flight from London to Seattle was C$ 321 for a one-way ticket and C$ 824 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.

  • Which airline alliances offer flights from London to Seattle?

    Star Alliance is the only airline alliance operating flights between London and Seattle.

  • Which is the best airline for flights from London to Seattle, United Airlines or WestJet?

    The two airlines most popular with KAYAK users for flights from London to Seattle are United Airlines and WestJet. With an average price for the route of C$ 298 and an overall rating of 7.4, United Airlines is the most popular choice. WestJet is also a great choice for the route, with an average price of C$ 420 and an overall rating of 7.2.

  • 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 3 airlines 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.
7.4
United AirlinesOverall score based on 8999 reviews
6.6Food
7.7Boarding
8.1Crew
7.1Entertainment
7.3Comfort
Airline reviews

The food quality sucks. One must starve if they do not eat flesh Or wheat based products Some variety would be expected. The trivial amount of snacks and or food is inhumane

4.0 OkayAnonymous, Oct 2025YVR - SFO
Read more United Airlines reviews

The food quality sucks. One must starve if they do not eat flesh Or wheat based products Some variety would be expected. The trivial amount of snacks and or food is inhumane

We Left Calgary 1/2 hour late and that made for a tight connection in Denver. After arriving everything was done to help us make our connection. That was a great effort. Thank You United

Efficient all round, very good crew. Short flight so the food, of course, was just snacks

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

My flight was delayed about 1 1/2 hours in Chicago, but other then that it was a good flight.

The experience was great, the crew was very polite and hospitable. I will definitely make if my go to airlines.

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

Efficient, calm when things were delayed and kept us regularly informed of what was happening.

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

Airbus plane, nice and polite staff, entertainment even as it was a short flight.

We landed 26 min early. It was awesome! Smooth ride too.

There is no snack and nit much that would be considered gluten free in yiur food selections. One of your snacks should be a gluten free cookie or small bar etc. maybe it was me but I didn’t see any free movies just internet connection and YouTube .

I like how spacious the plane was but I did not like the fact that there was no entertainment

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

In spite of purchasing premium, I felt it was perhaps the most uncomfortable seat I have flown in. The base was either broken or poorly made and had no support. Even placing pillows and blankets on the seat (1D aisle) didn’t help. It made for a long and mostly sleepless six hour flight. Crew also were very loudly talking to each other through the night making it very hard to sleep. It was purchased for the price, so I get the risk, but was not impressed.

Good value, minor delay due to waiting for inbound plane but they gave accurate information about wait time. Able to switch to a seat by my husband thanks to a kind flight attendant

Absolutely terrible, from the customer service to boarding the plane. On the phone, there was some mishaps with getting in my correct date and they did not help me retrieve a refund or any assistance. I’m gonna be reporting to all my followers and family around the region of Los Angeles to New York.

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

Generally good. However. The flight left 30 mins behind schedule with no reason given.

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

The free Wi-fi for Aeroplan members was a great touch. The time passed quickly. I found the seats seemed a little closer together than I remember. Not Air Canada's fault, but we were about 20 minutes late landing because the airport was too busy. We had to circle around for a while. The boarding and disembarking went very smoothly.

Too many delays. Seats too small. A budget airline. Will never fly Air Canada again.

Extremely turbulent landing. Crew was friendly and plane comfortable. Airport and US pre clearance was understaffed

The airplane is way too tight, you can hardly enter into your row to sit.. more like kids seats than adults.

Wifi was great. Kind air crew and comfortable seating. Also liked the entertainment options.

First message when all on board was that we didnt have a pilot, then they found one, then it was something about the bridge something not working, they will either fix or do manually. Flight of course was leaving late with all the cruise guests worrying about making it to their ship in time. Then only some luggage made it off the ship. Around 15 to 20 people waiting. 45 min later arrived except mine. I asked the rep at the luggage conveyor, he asked me my name. Then said it was not picked up with the first batch so they put it in a room. I was going to take public transport but now worried about time so took a taxi that cost me $65 USD

The flight was very smooth and good. Boarding was fast, but the staff was just decently friendly.

Air Canada flight staff are in contact negotiations and they are less than happy and it show. The process of self checking baggage is less than desirable with lack of support staff to help

A sandwich and a drink would have been better thank a snack bar...

I liked the behaviour of the crew members.The flight was good.

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

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