YXU - SFO

$171 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 4/8. 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 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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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$309
Typical prices: $232-$314
WestJet
Mon 5/18Thu 5/28
YXU - SFO • 1 stop
Cheapest one-way
$171
Air Canada
Wed 4/8
YXU - SFO • 1 stop
Top airlines
WestJet
Cheapest • from $309 (round-trip)
Air Canada
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between London and San Francisco. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Calgary (YYC)
Cheapest • Avg $267 (round-trip)
Toronto (YYZ)
Shortest trip • 8h 46m (one-way)
Insights
Insights
Insights
Insights
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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!
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

Mon, May 18 - Thu, May 28
WestJet Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
WestJet Logo
1:00 pm - 5:20 am
SFO
-
YXU
13h 20m
1 stop
$309WestJet
Mon, May 18 - Thu, May 28
WestJet Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
WestJet Logo
6:00 am - 1:30 pm
SFO
-
YXU
28h 30m
2 stops
$315WestJet
Mon, Mar 9 - Thu, Mar 12
United Airlines Logo
5:40 pm - 1:28 am
YXU
-
SFO
10h 48m
2 stops
United Airlines Logo
8:52 pm - 5:05 pm
SFO
-
YXU
17h 13m
2 stops
$368United Airlines
Sun, Mar 8 - Sat, Mar 14
United Airlines Logo
9:40 am - 12:16 am
YXU
-
SFO
17h 36m
2 stops
United Airlines Logo
5:05 am - 5:05 pm
SFO
-
YXU
9h 00m
2 stops
$369United Airlines
Wed, Jul 8 - Tue, Jul 28
Air Canada Logo
6:00 am - 10:42 am
YXU
-
SFO
7h 42m
1 stop
Air Canada Logo
4:35 pm - 8:55 am
SFO
-
YXU
13h 20m
2 stops
$429Air Canada
Mon, May 18 - Wed, May 27
United Airlines Logo
12:20 pm - 9:42 am
YXU
-
SFO
24h 22m
2 stops
United Airlines Logo
12:45 am - 5:33 pm
SFO
-
YXU
13h 48m
2 stops
$435United Airlines
Mon, Mar 9 - Thu, Mar 12
Air Canada Logo
5:10 am - 8:55 pm
YXU
-
SFO
18h 45m
1 stop
Air Canada Logo
8:52 pm - 5:05 pm
SFO
-
YXU
17h 13m
2 stops
$444Air Canada
Mon, Mar 9 - Thu, Mar 12
Air Canada Logo
5:40 pm - 10:39 am
YXU
-
SFO
19h 59m
2 stops
Air Canada Logo
4:20 pm - 8:46 am
SFO
-
YXU
13h 26m
1 stop
$447Air Canada
Tue, Jul 7 - Tue, Jul 28
Air Canada Logo
6:00 am - 10:42 am
YXU
-
SFO
7h 42m
1 stop
Air Canada Logo
7:35 pm - 8:55 am
SFO
-
YXU
10h 20m
2 stops
$449Air Canada
Mon, Mar 9 - Thu, Mar 12
Air Canada Logo
5:40 pm - 12:20 pm
YXU
-
SFO
21h 40m
2 stops
Air Canada Logo
4:20 pm - 8:46 am
SFO
-
YXU
13h 26m
1 stop
$452Air Canada
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.

Which airlines provide the cheapest flights from London to San Francisco?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from London to San Francisco were found on WestJet ($309) and United Airlines ($368).

Find deals

Good to know

Low seasonAugust
Cheapest flight$171
Best time to beat the crowds with an average 56% drop in price.
Most popular time to fly and prices are also 36% 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 $171 for a one-way ticket and $309 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 10735 reviews
7.1Comfort
6.8Entertainment
7.3Boarding
6.3Food
7.8Crew
Airline reviews

My experience was good with United too But only not so good thing was that at Calgary airport I was not given lounge access despite of flying business. Aspire lounge denied it to me, which was unfair I feel

8.0 ExcellentDr vandana, Feb 2026
YYC - SFO
Read more Air Canada reviews

My experience was good with United too But only not so good thing was that at Calgary airport I was not given lounge access despite of flying business. Aspire lounge denied it to me, which was unfair I feel

The staff was great and made the long trip easy peasy!

The free Wi-fi for Aeroplan members was a great touch. The time passed quickly. I found the seats seemed a little closer together than I remember. Not Air Canada's fault, but we were about 20 minutes late landing because the airport was too busy. We had to circle around for a while. The boarding and disembarking went very smoothly.

Too many delays. Seats too small. A budget airline. Will never fly Air Canada again.

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

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.

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

London (YXU)
San Francisco (SFO)