YXU

$104 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 5/21. 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
41.299.237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$270
WestJet
Tue 9/22Wed 10/7
SEA - YXU • 1 stop
Cheapest one-way
$214
Multiple Airlines
Thu 5/21
SFO - YXU • 2 stops
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
United's Economy Plus offers six extra inches of legroom.
WestJet's Extended Comfort seats include priority boarding.
Expert advice
Expert advice
Expert advice
Expert advice
Start a new search
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

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
$270WestJet
Tue, Jun 9 - Tue, Jun 16
WestJet Logo
6:05 pm - 5:20 am
LAX
-
YXU
8h 15m
1 stop
WestJet Logo
2:40 pm - 10:05 pm
YXU
-
LAX
10h 25m
2 stops
$270WestJet
Wed, Jun 10 - Wed, Jun 17
WestJet Logo
6:05 pm - 5:20 am
LAX
-
YXU
8h 15m
1 stop
WestJet Logo
6:10 am - 12:25 pm
YXU
-
LAX
9h 15m
1 stop
$273WestJet
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
$276WestJet
Thu, May 21 - Tue, May 26
Multiple Airlines Logo
10:01 pm - 5:20 am
SFO
-
YXU
28h 19m
2 stops
Multiple Airlines Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
$393Multiple Airlines
Wed, Jun 10 - Wed, Jun 17
Multiple Airlines Logo
7:35 pm - 5:20 am
SEA
-
YXU
6h 45m
1 stop
Multiple Airlines Logo
6:10 am - 6:26 pm
YXU
-
SEA
15h 16m
2 stops
$437Multiple Airlines
Tue, Jul 21 - Thu, Jul 23
United Airlines Logo
10:47 pm - 9:20 am
SFO
-
YXU
7h 33m
1 stop
United Airlines Logo
6:20 pm - 1:57 am
YXU
-
SFO
10h 37m
2 stops
$507United Airlines
Fri, Jul 10 - Tue, Jul 14
Air Canada Logo
11:47 pm - 2:55 pm
SFO
-
YXU
12h 08m
2 stops
Air Canada Logo
5:10 am - 3:09 pm
YXU
-
SFO
12h 59m
2 stops
$515Air Canada
Sat, Jun 13 - Sat, Jun 20
Air Canada Logo
9:55 am - 2:58 pm
ORD
-
YXU
4h 03m
1 stop
Air Canada Logo
10:05 am - 1:22 pm
YXU
-
ORD
4h 17m
1 stop
$530Air Canada
Thu, Sep 17 - Sun, Sep 20
United Airlines Logo
10:04 am - 5:43 pm
IAH
-
YXU
6h 39m
1 stop
United Airlines Logo
3:30 pm - 9:52 pm
YXU
-
IAH
7h 22m
1 stop
$792United Airlines
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, Air Canada and WestJet

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$214
Flight from San Francisco 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 3328 reviews
7.4Boarding
6.2Food
7.9Crew
7.0Comfort
6.1Entertainment
Airline reviews

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!

2.0 MediocreRosanna, Apr 2026
MCO - YYZ
Read more WestJet reviews

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.

Smooth flight Staff were courteous and welcoming upon entering and exiting the plane Pilot and crew provided frequent updates Leg space was not pleasant but manageable

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

It was good that our flight left early. It was a nice smooth flight and landing.

It was a problem because there was a delay where we sat before taking off from newark,then when landed in Toronto we sat on tarmac and they wouldn't let us out for a long period of time. When we finally were released to the airport in Toronto the attendant scanned our boarding pass that we were here for our connection to Brazil. We ran all the way to the gate and they said at the gate the door is shut so we can not let you on the plane. We explained that we were checked in by the attendant when we arrived at Toronto airport to go to Brazil and they should not have shut the door. We were ignored at the gate

Flight home was delayed multiple times, did not get home until 2am

the check-in lady at ORD was extremely rude and unprofessional. very disappointed as it was supposed to be a celebration for my wife's birthday and it really put a damper on things. if i wanted to be treated like trash, i would have flown Economy! (as opposed to business class)

My original flight was cancelled and then rebooked four hours later on a recovery flight, but I was checked in as stanby and had no seats so as a family of four we were concerned about not being seated altogether. Our flight then got delayed by another 1.5 hours and when seats were assigned at the gate, three of the four of us were together and we could get my wife closer, they offered no assistance.

Good boarding but extremely cold temperature in both flights (60 F!).

Very rude gate attendants in San Francisco who didn’t let me bring my little carry on (smaller than usual size) and after boarding I realized that there still were a lot of overhead compartment space (like a full section available in some spots). That made me lose 30 minutes at my destination at 1am and it could have broken something fragile that I had in it

I want to thank Carlos at the Miami AC desk - he was amazing and went over and above to help us out. Thank you Carlos and all the best to you!!! You made our faith in AC feel great! Sincerely, David Cubitt

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.