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$207 Find Cheap Flights to London - Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$339
Typical prices: $583-$860
WestJet
Wed 9/12Tue 9/18
SEA - YXU • 1 stop
Cheapest one-way
$207
Typical prices: $223-$482
Air Canada
Wed 10/10
SFO - YXU • 1 stop
Top airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
When to travel
Cheapest • 23% price drop
Most popular
Good to know
+1
Good to know
+1
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We hope you love your trip to London!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights to London

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals to London

Sat, Sep 12 - Fri, Sep 18
WestJet Logo
7:35 pm - 5:20 amSEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
WestJet Logo
5:55 pm - 9:40 amYXU  London-SEA Seattle/Tacoma Intl
18h 45m1 stop Calgary
$339WestJet
Wed, Sep 30 - Wed, Oct 7
WestJet Logo
6:05 pm - 5:20 amSFO  San Francisco-YXU London
8h 15m1 stop Calgary
WestJet Logo
6:10 am - 12:00 pmYXU  London-SFO San Francisco
8h 50m1 stop Calgary
$351WestJet
Thu, Sep 17 - Thu, Sep 24
WestJet Logo
6:00 am - 5:20 amSFO  San Francisco-YXU London
20h 20m1 stop Calgary
WestJet Logo
6:10 am - 12:00 pmYXU  London-SFO San Francisco
8h 50m1 stop Calgary
$359WestJet
Tue, Sep 15 - Mon, Sep 21
Multiple Airlines Logo
7:35 pm - 5:20 amSEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
Multiple Airlines Logo
6:10 am - 9:42 amYXU  London-SEA Seattle/Tacoma Intl
30h 32m2 stops Calgary Las Vegas Harry Reid Intl
$367Multiple Airlines
Thu, Oct 8 - Tue, Oct 13
WestJet Logo
7:35 pm - 5:20 amSEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
WestJet Logo
6:10 am - 6:45 pmYXU  London-SEA Seattle/Tacoma Intl
15h 35m1 stop Calgary
$396WestJet
Thu, Sep 17 - Thu, Sep 24
Air Canada Logo
12:50 pm - 9:20 amSFO  San Francisco-YXU London
17h 30m2 stops Edmonton Toronto Pearson Intl
Air Canada Logo
3:30 pm - 8:59 pmYXU  London-SFO San Francisco
8h 29m1 stop Toronto Pearson Intl
$443Air Canada
Thu, Sep 17 - Tue, Sep 22
Multiple Airlines Logo
6:30 pm - 5:20 amBOS  Boston Logan Intl-YXU London
10h 50m1 stop Calgary
Multiple Airlines Logo
6:10 am - 3:50 pmYXU  London-BOS Boston Logan Intl
33h 40m2 stops Calgary Ottawa
$444Multiple Airlines
Tue, Oct 20 - Thu, Oct 22
Air Canada Logo
11:35 am - 9:40 pmSFO  San Francisco-YXU London
7h 05m1 stop Toronto Pearson Intl
Air Canada Logo
5:40 am - 10:44 amYXU  London-SFO San Francisco
8h 04m1 stop Toronto Pearson Intl
$456Air Canada
Tue, Oct 20 - Thu, Oct 22
Air Canada Logo
6:40 am - 9:40 pmSFO  San Francisco-YXU London
12h 00m2 stops Vancouver Intl Toronto Pearson Intl
Air Canada Logo
5:40 am - 10:44 amYXU  London-SFO San Francisco
8h 04m1 stop Toronto Pearson Intl
$461Air Canada
Wed, Sep 30 - Wed, Oct 7
Multiple Airlines Logo
11:17 am - 5:20 amSFO  San Francisco-YXU London
15h 03m2 stops Las Vegas Harry Reid Intl Calgary
Multiple Airlines Logo
6:10 am - 12:00 pmYXU  London-SFO San Francisco
8h 50m1 stop Calgary
$461Multiple 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 is the cheapest day to fly to London?

Monday is the cheapest day to fly to London at $633 round-trip on average over the past 12 months on KAYAK. Sunday is the most expensive at $777.

What is the cheapest month to fly to London?

  • January is the cheapest month to fly to London with an average price of $543 round-trip.
  • March ($1,105) and June ($862) are the most expensive.
  • Based on KAYAK data over the past 12 months.

What is the cheapest time of day to fly to London?

Afternoon flights to London are the cheapest at $633 round-trip on average. Night flights are the most expensive at $733.

Expert advice

Expert advice for your flight to London

 
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.

Key details for flights to London

Low season

February

Cheapest flight

$207
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly and prices are also 1% lower on average.
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

Your questions about flights to London, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • What is the difference between the most popular and the most frequent airline at London?

    WestJet operates the most flights from the United States to London at 0 per week, while Air Canada is the airline most often selected by KAYAK users searching for flights from the United States to London. The two are often different because flight volume reflects an airline's schedule, while popularity reflects traveler choice.

  • How do I know if a flight to London is a good deal?

    A good deal on a flight to London is around $583 round-trip. This fare is in the lowest 25% of round-trip prices searched on KAYAK, averaged across the cities most often searched as origins by KAYAK users.

Your guide to booking London flights

From booking to airport arrival, find tips to help you plan your flight with more confidence.
  • For flights to London, recent KAYAK data shows that stronger deals tend to land around $583 round-trip. If you see a fare below that threshold, it's a strong deal – book before the price climbs back up.
  • If you can choose when to go, time your trip to London around January. Round-trip fares historically average $543 that month – typically the cheapest month to travel based on the last 12 months.
  • Before you book:

    • Check the route's typical price range so you can spot a deal.
    • Confirm baggage fees and seat-selection costs on budget carriers.
    • Verify whether you need any travel documents beyond ID.
    • Pick a departure airport, since your nearest may not be the cheapest origin.
  • Shift your departure to noon to save up to $100 per round-trip. Noon flights to London average $633 compared to $733 for evening flights. See the time-of-day chart above for the full breakdown.

Reviews of the top airlines flying to London

 
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 3434 reviews
7.0Comfort
7.9Crew
6.1Entertainment
7.4Boarding
6.2Food
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
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!

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

The seats very Uncomfortable, no meal and no entertainment for a 4Hours flight. Smooth Flight, Great Take off and landing. Superb crew!

West Jet flight was cancelled and I was not notified. I found out when I tried to check in on-line. Spent 4 hours on the phone with West Jet and Just Fly trying to figure what happened.

Flight was delayed 3 times. Then cancelled due to pilot being timed out. They refused hotel vouchers. Gate attendants were very rude and could not help you at all.

Flight was on time. Online check in capabilities made things quick and easy. Zone boarding was enforced, which I appreciate. Everyone was not lining up ahead of their zone being called. Crew was professional and friendly.

The big lady was sitting right next to me and the button to recline my seat was blocked by her huge arm. No power outlet for chargers. No inflight Wi-Fi movies

Trip was uneventful which is good. Boarding took a long time due to many disabled/elderly requiring assistance which again is fine. Landing and take off were excellent. Food and entertainment were as expected, bring your own if you have preferences otherwise you get what you get.

Okay but not like typical first or business class. On domestic airlines

Our seats that I had paid extra for near the front of the aircraft were no longer available on this replacement aircraft. We were told we either had to accept the new replacement seats in row 27 near the back in seats E and B, no longer together, or sit in the very back in row 30 squeezed into E and F seats that do not recline or have trays that provide a flat platform for a refreshment. This is not what I had expected. However, again your flight crew did the best they could given the circumstances.

Amazing and light experience, boarding on time, crew is super nice, clean salon and special thanks for movies availability. Provided by United Airlines

It would be nice to have access to the headphones since wifi wasn’t available. Passengers in front of me got them for free I was asked to pay for them. I heard stewardessa saying that headphones are complimentary since there is no wifi. When I requested headphones I had to pay. No room to sit. Bear given with the can but my drink was given in plastik cup. I will try not to fly with air Canada any more.

Boarded on time and arrived early. Overall quick flight. Snack and beverage offered.

Fine and uneventful I got to my destination safely No inflight entertainment Seats are not very comfortable

The upgraded seats on the smaller flights I guess is a toss up if you get a full meal. We paid less for the ticket on the way there and got a full meal where we got a snack and drink on the way home. The lounge was also in the other terminal too. No entertainment on the seat and no wifi on the plane.

Unfortunately, my experience was disappointing. The crew were not friendly or welcoming, which made the flight less pleasant. Our flight was delayed, and we almost missed our connecting flight because of it. To make matters worse, the gate number shown on the digital ticket was incorrect, causing unnecessary confusion and stress before departure. Overall, the lack of accurate information and poor customer service made this a frustrating travel experience.

Food was great, I wished there was better options for movies.

Had to cancel the flight because there was a 14 hour layover before the flight. Unacceptable.

The flight is very short, may be a little snack can be offered

They canceled my flight last minute, no hotel provided and they rescheduled Sunday night, hope they refunded some money

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