YXU - SFO

$172 Find Cheap Flights from London to San Francisco

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 San Francisco departing on 8/16. 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

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

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

Cheap Flights from London to San Francisco (YXU-SFO)

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

Sat, Aug 16 - Sat, Aug 23
WestJet Logo
6:00 am - 11:56 amYXU-SFO
8h 56m1 stop
WestJet Logo
2:45 pm - 5:14 amSFO-YXU
11h 29m2 stops
$279WestJet
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Sat, Aug 16 - Sat, Aug 23
WestJet Logo
6:00 am - 1:59 pmYXU-SFO
10h 59m2 stops
WestJet Logo
2:45 pm - 5:14 amSFO-YXU
11h 29m2 stops
$284WestJet
Find Deal
Fri, Aug 15 - Fri, Aug 22
WestJet Logo
8:00 pm - 1:59 pmYXU-SFO
20h 59m2 stops
WestJet Logo
2:45 pm - 5:14 amSFO-YXU
11h 29m2 stops
$285WestJet
Find Deal
Fri, Aug 15 - Fri, Aug 22
WestJet Logo
6:00 am - 11:56 amYXU-SFO
8h 56m1 stop
WestJet Logo
7:30 am - 5:14 amSFO-YXU
18h 44m1 stop
$289WestJet
Find Deal
Wed, Dec 10 - Wed, Jan 7
Air Canada Logo
9:25 am - 3:15 pmYXU-SFO
8h 50m1 stop
Air Canada Logo
6:00 pm - 8:46 amSFO-YXU
11h 46m2 stops
$324Air Canada
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Wed, Sep 24 - Sun, Oct 12
Air Canada Logo
6:15 am - 3:28 pmYXU-SFO
12h 13m2 stops
Air Canada Logo
7:10 am - 9:27 pmSFO-YXU
11h 17m2 stops
$350Air Canada
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Sat, Oct 11 - Fri, Oct 17
Delta Logo
6:00 am - 11:54 amYXU-SFO
8h 54m1 stop
Delta Logo
7:30 am - 7:07 pmSFO-YXU
8h 37m1 stop
$401Delta
Find Deal
Sun, Dec 14 - Wed, Dec 31
United Airlines Logo
5:45 am - 10:59 amYXU-SFO
8h 14m1 stop
United Airlines Logo
12:32 am - 5:06 pmSFO-YXU
13h 34m2 stops
$409United Airlines
Find Deal
Tue, Dec 16 - Tue, Jan 6
United Airlines Logo
5:40 pm - 1:09 amYXU-SFO
10h 29m2 stops
United Airlines Logo
11:59 pm - 5:06 pmSFO-YXU
14h 07m2 stops
$415United Airlines
Find Deal
Sat, Aug 16 - Sat, Aug 23
 Logo
6:00 am - 1:59 pmYXU-SFO
10h 59m2 stops
 Logo
10:15 am - 5:14 amSFO-YXU
15h 59m3 stops
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KAYAK's insights & trends for London to San Francisco flights

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

What is the cheapest month to fly from London to San Francisco?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to San Francisco, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from London to San Francisco is May, where tickets cost $267 (return) on average. On the other hand, the most expensive months are December and January, where the average cost of round-trip tickets is $651 and $570 respectively.

Good to know

Low seasonFebruary
High seasonJune
Cheapest flight$172
Best time to beat the crowds with an average 22% drop in price.
Most popular time to fly and prices are also 31% lower on average.
Flight from London to San Francisco

When to book flights from London to San Francisco

Are your dates flexible? Find out the best times to travel from London to San Francisco 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 San Francisco

  • What is the cheapest flight from London to San Francisco?

    In the last 3 days, the lowest price for a flight from London to San Francisco was $172 for a one-way ticket and $279 for a round-trip.

  • Do I need a passport to fly between London and San Francisco?

    A passport is required to fly from London to San Francisco.

  • Which aircraft models fly most regularly from London to San Francisco?

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

  • Which airline alliances offer flights from London to San Francisco?

    Star Alliance, and SkyTeam are the airline alliances operating flights between London and San Francisco, with Star Alliance being the most commonly used for this route.

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

    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 San Francisco.

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

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

    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 San Francisco with an airline and back to London with another airline. Booking your flights between London and SFO can sometimes prove cheaper using this method.

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

    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 San Francisco 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 San Francisco

 
See real verified KAYAK customer reviews for airlines flying from London to San Francisco. 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 San Francisco? 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.
7.1
Air CanadaOverall score based on 9681 reviews
6.3Food
7.1Comfort
7.3Boarding
6.8Entertainment
7.8Crew
Airline reviews

Somebody either kayak or Air Canada booked my flight under my preferred name Betty instead of my legal name and I almost was denied boarding my flight

2.0 MediocreAnonymous, May 2025YYZ - LAX
Read more Air Canada reviews

Somebody either kayak or Air Canada booked my flight under my preferred name Betty instead of my legal name and I almost was denied boarding my flight

Short flight so no food or entertainment. Good landing at SFO and on time. We were told no carryon luggage yet lots of people were puting bags in overhead compartments. The rules need to be made more clear. I was on the first leg of an international flight and this is the first time I could not have carryon luggage.

Ensure prepaid food arrangements are appropriately understood by flight crew of who purchased and who did not

Terrible all around. Flight was late and airplane was very uncomfortable. The crew were unhelpful and hid in the back. Did zero work. No entertainment.

I booked and paid extra for exit door seats also pre paid for my luggage air Canada changed plains and I never got what I paid for and they made me pay for luggage again they also did this to my wife. They are the most unorganized company I have ever dealt with. I am sure I will never see the extra money I paid for the seats or the recharge for the luggage. They are subsidized by the taxpayers and don’t give a dam just a horrible way to do business

Your crew was so so so wonderful Only thing sound be great if you kept some phone chargers and converters rest 👌👌👌👌

The speakers were way too loud. Music was played during boarding too. This noise could've been avoided.

The TSA people or whatever you call them were a bit rude- I asked why I had to take my shoes off bc I'm 75 and in the USA, I don't have to. The man didn't need to snap at me. It wasn't even busy! The plane was ok, a bit small for such a long flight, but I'm very familiar with the 737 used ( I fly it often between SFO and SAN) service was ok-nothing special. If I drank alcohol I guess I would be happy with free choices. the plane was HOT and even the FA commented on it. They tried to get it cooler, but it never happened.

Multiple change of the gates at Pearson, delayed flight was extremely uncomfortable.

Easy boarding, punctuality, decent service. I can only complain about the measly snack.

Everything you need to know for your flight from London to San Francisco

Information on your arrival and departure airports

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