YXU - SFO

$174 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 10/27. 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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Flight Deals
Booking Insights
Flight 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

Tue, Oct 21 - Mon, Oct 27
Air Canada Logo
3:40 pm - 8:53 pmYXU-SFO
8h 13m1 stop
Air Canada Logo
2:30 pm - 8:46 amSFO-YXU
15h 16m1 stop
$380Air Canada
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Thu, Feb 5 - Mon, Feb 9
Air Canada Logo
5:45 am - 2:56 pmYXU-SFO
12h 11m2 stops
Air Canada Logo
8:49 am - 9:21 pmSFO-YXU
9h 32m1 stop
$384Air Canada
Find Deal
Fri, Oct 31 - Fri, Nov 7
United Airlines Logo
9:25 am - 9:22 pmYXU-SFO
14h 57m2 stops
United Airlines Logo
7:10 pm - 5:05 pmSFO-YXU
18h 55m2 stops
$390United Airlines
Find Deal
Tue, Oct 21 - Mon, Oct 27
Air Canada Logo
6:15 am - 1:35 pmYXU-SFO
10h 20m2 stops
Air Canada Logo
8:50 am - 9:21 pmSFO-YXU
9h 31m1 stop
$403Air Canada
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
5:45 am - 10:54 amYXU-SFO
8h 09m1 stop
United Airlines Logo
8:30 am - 9:21 pmSFO-YXU
9h 51m1 stop
$420United Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
5:45 am - 12:12 amYXU-SFO
21h 27m2 stops
United Airlines Logo
8:30 am - 9:21 pmSFO-YXU
9h 51m1 stop
$426United Airlines
Find Deal
Sat, Oct 4 - Wed, Oct 8
United Airlines Logo
3:40 pm - 9:32 pmYXU-SFO
8h 52m1 stop
United Airlines Logo
5:00 am - 9:17 amSFO-YXU
25h 17m2 stops
$453United Airlines
Find Deal
Sat, Oct 4 - Wed, Oct 8
Multiple Airlines Logo
6:15 am - 2:40 pmYXU-SFO
11h 25m2 stops
Multiple Airlines Logo
11:35 am - 9:17 amSFO-YXU
18h 42m2 stops
$458Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
5:45 am - 9:05 pmYXU-SFO
18h 20m2 stops
United Airlines Logo
5:00 am - 9:21 pmSFO-YXU
13h 21m2 stops
$484United Airlines
Find Deal
Tue, Oct 21 - Mon, Oct 27
Air Canada Logo
6:15 am - 1:35 pmYXU-SFO
10h 20m2 stops
Air Canada Logo
6:53 pm - 8:46 amSFO-YXU
10h 53m2 stops
$501Air Canada
Find Deal

Everything you should know

Top airlines
Air Canada
Cheapest • from $380 (round-trip)
Air Canada
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
August
Cheapest • 53% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$380
Overall average: $316
Air Canada
Tue 10/21Mon 10/27
YXU - SFO • 1 stop
Cheapest one-way
$174
Typical prices: $181-206
Multiple Airlines
Mon 10/27
YXU - SFO • 2 stops
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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 San Francisco!
Booking Insights

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 August, where tickets cost $185 (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
Cheapest flight$174
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly and prices are also 33% 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 $174 for a one-way ticket and $380 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 is the only airline alliance operating flights between London and San Francisco.

  • 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 10000 reviews
7.3Boarding
6.3Food
7.1Comfort
6.8Entertainment
7.8Crew
Airline reviews

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

8.0 ExcellentAnonymous, Sep 2025YYZ - SFO
Read more Air Canada reviews

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

No food to provide, they forgot that, in some cases, people stay at the airport for hours without food. Now, to provide them with food, they have to ask them to pay, because some don't have money. That way, they can't eat.

Flight was cancelled last minute. Had to scramble and purchase a $2000 flight through a separate airlines. Stuck in Toronto two extra days. Missed my first two days on a new job. Had to rent a car for an additional two days. Scrambled to fins a place to live those extra two days. Spent a ton of extra money and lost a lot of money, as well as made a poor impression at work. Difficult difficult difficult

Terrible, return flight was cancelled a night before the flight was scheduled to depart and I was notified by an email and an automated message on their phone line. I’ll never book Air Canada again

Horrible, we were on a little DeHaviland 400 that was really small and shaky. I am 5' 4" and I had to duck my head to get in it felt like an old war plane.

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.

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.

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

Information on your arrival and departure airports

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