SFO - YXU

$139 Find Cheap Flights from San Francisco to London

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Francisco to London departing on 4/23. 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 London

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

Cheapest round-trip
$351
Air Canada
Sat 4/11Wed 4/15
SFO - YXU • 1 stop
Cheapest one-way
$159
Air Canada
Thu 4/23
SFO - YXU • 2 stops
Top airlines
Air Canada
Cheapest • from $351 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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Booking Insights
Flight Deals

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

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

Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
8:30 am - 9:18 pm
SFO
-
YXU
9h 48m
1 stop
Air Canada Logo
5:10 am - 10:55 am
YXU
-
SFO
8h 45m
1 stop
$351Air Canada
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
8:30 am - 9:18 pm
SFO
-
YXU
9h 48m
1 stop
Air Canada Logo
5:10 am - 3:32 pm
YXU
-
SFO
13h 22m
2 stops
$357Air Canada
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
7:25 am - 9:18 pm
SFO
-
YXU
10h 53m
2 stops
Air Canada Logo
5:10 am - 3:32 pm
YXU
-
SFO
13h 22m
2 stops
$362Air Canada
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
8:30 am - 9:18 pm
SFO
-
YXU
9h 48m
1 stop
Air Canada Logo
9:25 am - 3:20 pm
YXU
-
SFO
8h 55m
1 stop
$431Air Canada
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
7:25 am - 9:18 pm
SFO
-
YXU
10h 53m
2 stops
Air Canada Logo
9:25 am - 3:20 pm
YXU
-
SFO
8h 55m
1 stop
$436Air Canada
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
7:25 am - 9:18 pm
SFO
-
YXU
10h 53m
2 stops
Air Canada Logo
5:10 am - 3:32 pm
YXU
-
SFO
13h 22m
2 stops
$442Air Canada
Fri, Mar 27 - Fri, Apr 3
United Airlines Logo
8:52 pm - 5:05 pm
SFO
-
YXU
17h 13m
2 stops
United Airlines Logo
9:25 am - 7:37 pm
YXU
-
SFO
13h 12m
2 stops
$452United Airlines
Fri, Apr 17 - Mon, Apr 20
Air Canada Logo
2:30 pm - 8:43 am
SFO
-
YXU
15h 13m
1 stop
Air Canada Logo
5:10 am - 10:55 am
YXU
-
SFO
8h 45m
1 stop
$456Air Canada
Fri, Mar 27 - Fri, Apr 3
United Airlines Logo
8:52 pm - 5:05 pm
SFO
-
YXU
17h 13m
2 stops
United Airlines Logo
9:25 am - 9:30 pm
YXU
-
SFO
15h 05m
1 stop
$461United Airlines
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
8:30 am - 9:18 pm
SFO
-
YXU
9h 48m
1 stop
Air Canada Logo
9:25 am - 3:20 pm
YXU
-
SFO
8h 55m
1 stop
$468Air Canada
Booking Insights

KAYAK's insights & trends for San Francisco to London flights

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

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

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 San Francisco to London were found on Air Canada ($351) and United Airlines ($452).

Good to know

Cheapest flight$159
Flight from San Francisco to London

When to book flights from San Francisco to London

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

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

    In the last 3 days, the lowest price for a flight from San Francisco to London was $139 for a one-way ticket and $351 for a round-trip.

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

    Yes, you'll most likely have to show a valid passport before boarding the plane in San Francisco and on arrival in London.

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

    On your way to London, you’ll fly out from San Francisco. You’ll be landing at London.

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

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

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

    Star Alliance is the only airline alliance operating flights between San Francisco and London.

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

    The two airlines most popular with KAYAK users for flights from San Francisco to London are United Airlines and WestJet. With an average price for the route of $351 and an overall rating of 7.4, United Airlines is the most popular choice. WestJet is also a great choice for the route, with an average price of $478 and an overall rating of 7.2.

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

    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 San Francisco to London.

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

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

    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 London with an airline and back to San Francisco with another airline. Booking your flights between San Francisco and YXU 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 San Francisco to London?

    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 London from San Francisco up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from San Francisco to London

 
See real verified KAYAK customer reviews for airlines flying from San Francisco to London. 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 San Francisco 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.
7.4
United AirlinesOverall score based on 9273 reviews
7.3Comfort
7.7Boarding
7.1Entertainment
6.6Food
8.1Crew
Airline reviews

The flight crew where really good. Better then the crew from BNE to SFO

10.0 ExcellentVanessa, Jan 2026
SFO - IAD
Read more United Airlines reviews

The flight crew where really good. Better then the crew from BNE to SFO

Food should be changed in menu Many muslims travels in this airlime they need to add one Halal meal

left on time, reasonable boarding process arrived early luggage came out quickly

Some flight attendants were great others were cranky. Seats were very tight and sitting on an aisle was very hard as the carts and people walking constantly bumped shoulder and arm.

Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

This was an older airplane. The cabin was constantly warm to hot throughout the 10 hour flight and there were no vents to personalize air flow. Also since it was an older plane, the material and comfort of the chairs were very uncomfortable. I left my flight with major soreness on my tailbone.

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

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

They lost my bag. Hopefully it will be here tomorrow.

The flight was cancelled less than 24 hours before departure. The alternate flight was a day later going from Grenada to Toronto to Vancouver to Calgary to Montreal. 2 days in the air. Not serious, Very bad service

The trip from LAX to Calgary was aboard a 737-700, which is more than twenty years old. Service was fine, and the food was good, but there was no inflight entertainment, and no WiFi. The flight from Calgary to Vancouver was also delayed more than an hour, due to congestion on the Calgary tarmac. And no food service, but there was in-flight WiFi which made a big difference.

I like the wider seats, Plus lots of legroom, Lacking entertainment, no tv or screen to play with

Liked in-flight wifi Did not like - nothing to complain, really. All good

Kayak was the problem! The tickets we bought did not allow for carry on or checked luggage and we ended up paying more for those services than the tickets! The paperwork Kayak provided for the receipt left the luggage policy for Westair intentionally blank. This was intentionally decietful on Kayak's part. Our additional cost was over $400.00! I will be calling customer service today asking for refunds and I will keep you informed on any review sites as I can. Keith

The keg from Edmonton to Toronto My wife found it very cold. Other than that great flight.

Smooth flight Staff were courteous and welcoming upon entering and exiting the plane Pilot and crew provided frequent updates Leg space was not pleasant but manageable

Everything was good except I was a bit disappointed that I had to pay US $150 for bags.

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

The flight left late and I didn’t get a glass of bubbly upon boarding (which I’m used to when booking business class on other flights), but otherwise it was a pleasant flight with lovely, helpful crew members and I enjoyed my meal.

Flight was canceled for a reason they knew hours before but did not mention. Next the gate chnage from 37 to 38 at least 10 times. Ridiculous.

The flight from SFO to YVR was delayed and my bag did not make it to my next flight from YVR to SYD. It took almost 3 days after I landed to get my bag and when I got it, it was filled with dust

All attendents were very efficient, pleasant and happy. Everything went smoothly. The seats could have been wider. There could have been more free food instead of just one small bar.

I liked a lot , the flight attendant so nice ,the seat very comfortable I enjoyed the flight , I will do it again with Air Canada,

The crew was really nice. The plane seats were kinda small even for a 5’6” / 158 lbs person.

Re luggage I carried a backpack only. I did not check any bags in. However there were other passengers with carry on luggage going in the plane. My question is why are others allowed to have a carry on luggage inside the plane? Shouldn’t they have dropped it off at the gate? I’m asking because I could have brought the same thing instead of a backpack only. Please clarify for future reference. Thank you.

Like the service. Very hard to communicate or contact when have problems

They rescheduled me and I had no issues with the new flight

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

Information on your arrival and departure airports