YXU

$220 Find Cheap Flights to London

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to London departing on 8/28. 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 London

 
These are the airlines KAYAK users have selected most often from within our search results for flights to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to London, as well as popular online travel agencies
Travelers love KAYAK
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Everything you should know

Cheapest round-trip
$462
WestJet
Wed 9/23Wed 10/7
SEA - YXU • 1 stop
Cheapest one-way
$220
WestJet
Fri 8/28
SEA - YXU • 1 stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to London!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights to London

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights to London 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 to London

Wed, Sep 23 - Wed, Oct 7
WestJet Logo
7:35 pm - 5:20 am
SEA
-
YXU
6h 45m
1 stop
WestJet Logo
6:10 am - 6:45 pm
YXU
-
SEA
15h 35m
1 stop
$462WestJet
Tue, Sep 22 - Wed, Oct 7
WestJet Logo
7:35 pm - 5:20 am
SEA
-
YXU
6h 45m
1 stop
WestJet Logo
6:10 am - 6:45 pm
YXU
-
SEA
15h 35m
1 stop
$465WestJet
Thu, Jul 16 - Tue, Jul 21
WestJet Logo
7:35 pm - 5:20 am
SEA
-
YXU
6h 45m
1 stop
WestJet Logo
8:40 pm - 9:40 am
YXU
-
SEA
16h 00m
1 stop
$467WestJet
Thu, Aug 6 - Mon, Aug 10
WestJet Logo
7:00 am - 4:45 pm
SEA
-
YXU
6h 45m
1 stop
WestJet Logo
5:55 pm - 9:40 am
YXU
-
SEA
18h 45m
1 stop
$489WestJet
Wed, Sep 23 - Wed, Oct 7
WestJet Logo
7:35 pm - 4:45 pm
SEA
-
YXU
18h 10m
1 stop
WestJet Logo
6:10 am - 6:45 pm
YXU
-
SEA
15h 35m
1 stop
$497WestJet
Wed, Jul 8 - Tue, Jul 14
WestJet Logo
7:35 pm - 5:20 am
SEA
-
YXU
6h 45m
1 stop
WestJet Logo
5:55 pm - 9:40 am
YXU
-
SEA
18h 45m
1 stop
$512WestJet
Thu, Jul 30 - Thu, Aug 6
Multiple Airlines Logo
6:00 am - 5:20 am
BOS
-
YXU
23h 20m
3 stops
Multiple Airlines Logo
3:30 pm - 9:27 pm
YXU
-
BOS
5h 57m
2 stops
$578Multiple Airlines
Sun, Jul 26 - Sun, Aug 2
Air Canada Logo
8:45 am - 5:42 pm
ORD
-
YXU
7h 57m
2 stops
Air Canada Logo
10:05 am - 1:22 pm
YXU
-
ORD
4h 17m
1 stop
$607Air Canada
Mon, Jul 13 - Sun, Jul 19
Air Canada Logo
4:20 pm - 8:32 pm
IAD
-
YXU
4h 12m
1 stop
Air Canada Logo
10:05 am - 3:24 pm
YXU
-
IAD
5h 19m
1 stop
$620Air Canada
Fri, Jun 26 - Mon, Jun 29
Air Canada Logo
3:45 pm - 9:37 pm
ORD
-
YXU
4h 52m
1 stop
Air Canada Logo
10:05 am - 8:29 pm
YXU
-
ORD
11h 24m
1 stop
$622Air Canada
Booking Insights

KAYAK's insights & trends for flights to London

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

What are the most popular airlines flying to London?

The most popular airline among KAYAK users flying to London is Air Canada, followed by Porter Airlines and United Airlines.

Expert advice

Expert advice for your flight to London

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines, WestJet and Air Canada

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Good to know - Book Cheap London Plane Tickets

Cheapest flight$220
Most popular time to fly with an average 43% increase in price.
Flight from Seattle to London

When to book flights to London

Are your dates flexible? Find out the best times to travel to London 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. The information is for flights to London based on your location. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs - booking London flights

  • How far is London Airport from central London?

    There are 5 miles between London city center and London Airport.

  • What is the name of London’s airport?

    There is only 1 airport in London, called London Airport (YXU). It can also be referred to as London or London Intl.

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

    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 to London.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to 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 to London?

    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 London with an airline and back with another airline.

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

    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 London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to London

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest London flight deals.

Reviews of the top airlines flying to London

 
See real verified KAYAK customer reviews for airlines flying to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from the United States to London. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with to London? 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 3362 reviews
7.0Comfort
6.1Entertainment
7.4Boarding
7.9Crew
6.2Food
Airline reviews

Westjet never disappoint always terrible small plane ,crowded cheap snack if you can call it snack

4.0 OkayMiguel, Apr 2026
MBJ - YYZ
Read more WestJet reviews

Westjet never disappoint always terrible small plane ,crowded cheap snack if you can call it snack

Westjet was late and we missed our connecting flight with Cathay. Had to wait 8 hours. Westjet only allows 1 checked in baggage for international flights- it’s always been 2. Canada allows only 1 sandwhich bag size full off small liquids. Everything else will be tossed. Awful trip. Will never fly west jet or go to Toronto to connect flights!

I didn’t have any food but my Prosecco hit the spot. We left on time and the crew was friendly.

I thought the coffee was excellent! The wait for the luggage was acceptable.. It left and arrived on time. My son found that his device worked very well and he really enjoyed his flight! The stewardess moved him up to the emergency exit and he very much appreciated that!

I wasn’t able to book or pay for a seat and they forgot to check me in for my third flight so I spent 24 hours in Toronto waiting for another one.

Everything was good except for flight delay, but it was because of the snow storm in the arrival airport.

The flight was cancelled less than 24 hours before departure. The alternate flight was a day later going from Grenada to Toronto to Vancouver to Calgary to Montreal. 2 days in the air. Not serious, Very bad service

I like the wider seats, Plus lots of legroom, Lacking entertainment, no tv or screen to play with

Liked in-flight wifi Did not like - nothing to complain, really. All good

The keg from Edmonton to Toronto My wife found it very cold. Other than that great flight.

Flight was overbooked and seats assigned to multiple passengers. Delay 1 hour to sort out.

Good but I don’t received my bags yet is been 5days still no update

It was a short flight so, everything went smoothly and we got to where we needed to be safely.

No TV on the flight. The charging outlet was not working. No food, even a sandwich. The served orange was poor quality.

Selected seats 5 months prior to date. Had email confirmation and seats were not honoured. Family did not sit together

They did not let us board because one member needed a transit visa, which was not evident at the time of ticket purchase.

I was charge a baggage checking fee $68!! I volunteered to check my duffle bag which usually goes under my seat!

I did not like anything because the flight was cancelled yesterday and I did not get to arrive on time in Toronto as I was rebooked with another airline. This caused me to be really stressed out as I am an individual with back injury and to be forced to stay longer in an airport to accommodate a change of airline and the transfers associated with it Due to this I am probably not going to book through your website to eliminate this potentially chaos in the future

shittiest airline in the hemisphere. To improve - start thinking you're flying people, not cattle

Easy boarding, inflight refreshments came on time and comfortable seat

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Grand Bend

Everything you need to know for your flight to London

Flights with popular airlines flying to London

Flights from the other most popular airlines that fly from the United States to London according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.