YXU - SFO

C$ 360 Find Cheap Flights from London to San Francisco

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to San Francisco departing on 17/5. 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

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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Cheap Flight Deals 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.

Recent round-trip flight deals from London to San Francisco

KAYAK's recommended round-trip deals from the most popular airlines that fly from London to San Francisco.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
WestJet Logo
8:00 p.m. - 9:25 p.m.YXU-SFO
28h 25m1 stop
WestJet Logo
6:05 p.m. - 5:14 a.m.SFO-YXU
8h 09m1 stop
C$ 360WestJet
Find Deal
Sat, 17 May - Sat, 24 May
Air Canada Logo
3:45 p.m. - 9:49 p.m.YXU-SFO
9h 04m1 stop
Air Canada Logo
10:56 p.m. - 9:18 a.m.SFO-YXU
7h 22m1 stop
C$ 385Air Canada
Find Deal
Tue, 13 May - Mon, 9 Jun
United Airlines Logo
3:40 p.m. - 9:49 p.m.YXU-SFO
9h 09m1 stop
United Airlines Logo
10:45 p.m. - 3:03 p.m.SFO-YXU
13h 18m2 stops
C$ 409United Airlines
Find Deal
Sat, 17 May - Sat, 24 May
WestJet Logo
8:00 p.m. - 12:05 p.m.YXU-SFO
19h 05m1 stop
WestJet Logo
2:45 p.m. - 5:14 a.m.SFO-YXU
11h 29m2 stops
C$ 412WestJet
Find Deal
Tue, 13 May - Mon, 9 Jun
United Airlines Logo
3:40 p.m. - 1:12 a.m.YXU-SFO
12h 32m2 stops
United Airlines Logo
4:31 p.m. - 3:03 p.m.SFO-YXU
19h 32m2 stops
C$ 418United Airlines
Find Deal
Sat, 17 May - Sat, 24 May
WestJet Logo
8:00 p.m. - 1:59 p.m.YXU-SFO
44h 59m2 stops
WestJet Logo
2:45 p.m. - 5:14 a.m.SFO-YXU
11h 29m2 stops
C$ 536WestJet
Find Deal
Tue, 13 May - Mon, 9 Jun
United Airlines Logo
3:25 p.m. - 9:49 p.m.YXU-SFO
9h 24m1 stop
United Airlines Logo
11:03 p.m. - 3:03 p.m.SFO-YXU
13h 00m2 stops
C$ 542United Airlines
Find Deal
Tue, 22 Apr - Wed, 21 May
United Airlines Logo
3:25 p.m. - 9:45 a.m.YXU-SFO
21h 20m2 stops
United Airlines Logo
11:03 p.m. - 3:03 p.m.SFO-YXU
13h 00m2 stops
C$ 549United Airlines
Find Deal
Tue, 22 Apr - Wed, 21 May
 Logo
3:25 p.m. - 9:49 p.m.YXU-SFO
9h 24m1 stop
 Logo
2:15 p.m. - 9:18 a.m.SFO-YXU
16h 03m1 stop
C$ 627
Find Deal
Tue, 22 Apr - Wed, 21 May
United Airlines Logo
3:25 p.m. - 9:49 p.m.YXU-SFO
9h 24m1 stop
United Airlines Logo
12:10 a.m. - 9:28 p.m.SFO-YXU
18h 18m2 stops
C$ 664United Airlines
Find Deal
Tue, 22 Apr - Tue, 20 May

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 June, where tickets cost C$ 378 (return) on average. On the other hand, the most expensive months are December and January, where the average cost of round-trip tickets is C$ 931 and C$ 815 respectively.

Good to know

Low season

February

High season

July

Cheapest flight

C$ 360
Best time to beat the crowds (26% less expensive on average)
Most popular time to fly (1% more expensive 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 C$ 252 for a round-trip ticket.

  • Which airports will I be using when flying from London to San Francisco?

    London airport is called London and the only airport in San Francisco is 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.

  • Which is the best airline for flights from London to San Francisco, WestJet or Air Canada?

    The two airlines most popular with KAYAK users for flights from London to San Francisco are WestJet and Air Canada. With an average price for the route of C$ 524 and an overall rating of 7.2, WestJet is the most popular choice. Air Canada is also a great choice for the route, with an average price of C$ 640 and an overall rating of 7.0.

  • 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.

  • 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.

See more FAQs

Top airlines 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.
7.2
WestJetOverall score based on 2795 reviews
7.4Boarding
7.9Crew
6.1Entertainment
7.0Comfort
6.2Food
Airline reviews

We never had an experience they canceled the flight and they did not offer us an alternative flight. I had to book one on my own expense. They offered us food voucher and we could not use them at the airport it kept saying not attached to an existing flight. The people at the counter were rude and cold and they did not care about our situation

2.0 MediocreDoha, Apr 2025YYZ - YVR
Read more WestJet reviews

We never had an experience they canceled the flight and they did not offer us an alternative flight. I had to book one on my own expense. They offered us food voucher and we could not use them at the airport it kept saying not attached to an existing flight. The people at the counter were rude and cold and they did not care about our situation

It took 30 minutes to check in with the Westjet rep. They didn’t have enough seats and she needed to make a call… I am always “randomly” selected to be checked at security. Their “randomly “ selection system may need some updating. They treat people like criminals. It is not appropriate behavior.

Found the seats very crowded—too close together ! And waited a long time for our luggage All staff at both ends were excellent!!!

Flight cancelled and Kayak switched our return flight to a red eye. Ridiculous.

Will never book through you again. Very disappointed in the notices and action taken or provided when planes are rescheduled, enough to cause missed connections

Very good over all , would have been nice to have entertainment on the flight

Absolutely the worst airline I have ever taken. They lost my baggage and told me my bag tags had been cancelled. When my bags arrived days later I had to pick them up at 3:15 am. My return flight was delayed another 6 hours and they broke my bag. Westjet does nothing to try and make it a better customer experience and all the customers services representatives I spoke with were useless and incompetent. Never flying westjet again.

Easy self checkin and baggage drop. No in seat entertainment, but wifi and app worked well

Single flights to Cancun purchased through third-party, initially had issues printing luggage labels with the lady at the airport Pearson… Was super friendly and assisted quickly despite being very busy

Very old planes. Seats were not comfortable. Air was not on during the flight leading to incredibly stuffy conditions.

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.

Never made this leg of the flight since we rebooked through United instead. Did not make it to immigration/US custom due to the delay. Had to spend the night on our own dime in Toronto

Booked flight was cancelled. Was rebooked but sat in airport for several hours for new departure.

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

Information on your arrival and departure airports

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