Find Cheap Flights from San Francisco to London (SFO - LON)

Search hundreds of travel sites at once for deals on flights to London

Sat 11/25
Sat 12/2
Any month
Compare vs. KAYAK |

Good to Know

Low Season:
February
Best time to beat the crowds
3%
expected price decrease
High Season:
July
Most popular time to fly
19%
expected price increase
Average Price:
$1842
(avg. price over the last 2 weeks)
Good Deal:
$1515
or less (round trip)

When to Book Flights from San Francisco to London

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $1514 or less.
The cheapest flight from San Francisco to London was found 67 days before departure, on average.
Book at least 3 weeks before departure in order to get a below-average price.
High season is considered to be June, July and August. The cheapest month to fly is February.
Morning departure is around 3% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking San Francisco to London Flights

How long does a flight from San Francisco to London take?
An average nonstop flight takes 10h 10m, covering a distance of 5362 miles.
How many flights are there between San Francisco and London?
There are 429 (nonstop) flights between San Francisco and London per week, averaging 60 per day.
Which airlines provide the cheapest flights from San Francisco to London?
In the past 3 days, the cheapest round-trip tickets were found on WOW air ($330), Virgin Atlantic ($466) and Multiple Airlines ($508).
Do I need a passport to fly between San Francisco and London?
Yes.
Which airlines fly most frequently between San Francisco and London?
Air New Zealand (9 times daily), Delta (7 times daily), Virgin Atlantic (7 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly San Francisco to London?
For San Francisco to London, Thursday is the cheapest day to fly on average and Sunday is the most expensive. Flying from London back to San Francisco, the best deals are generally found on Wednesday, with Monday being the most expensive.

Book cheap flights from San Francisco to London (round-trip)

Airports
Origin
San Francisco
$330
only
$330
Destination
London
$466
only
$466
$330
only
$330
Thu, Jan 11
SFO
LGW
14h 10m
Fri, Jan 19
LGW
SFO
14h 45m
Trip: 9 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 1067 reviews
Overall
6.0
Boarding
6.4
Comfort
5.7
Crew
7.0
Entertainment
4.2
Food
4.7
DUB
KEF
Excellent 10.0

very nice flight attendents

BOS
KEF
Excellent 8.0

cheap and clean with efficiency.

No TV game or movie.

KEF
BOS
Good 6.0

They boarded us through the gate and then we just waited on the walkway to the airplane since they weren't letting anyone in. Very frustrating. Flight was delayed.

BWI
KEF
Excellent 10.0

Crews are helpful and friendly! Great price, half of my flights were on brand new equipment! Highly recommend this airline!

BOS
KEF
Excellent 8.0

Good crew

First leg was 1 hr late

Thu, Mar 8
SFO
LHR
10h 10m
Sat, Mar 10
LHR
SFO
14h 02m
Trip: 3 days
8.2ExcellentShow reviews
Overall 8.2 Excellent
Based on 38 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.1
Food
7.8
SFO
LHR
Excellent 10.0

Efficient, friendly, on-time!

SFO
LHR
Excellent 10.0

Very attentive and friendly crew! The plane was nice and clean, nice purple tinted lights. They served us plenty of complementary meals, snacks, mints and drinks. The in flight entertainment was the best I've seen yet: movies, tv, music, games, all recent and easy to use. We will definitely fly Virgin Atlantic again!

SFO
LHR
Excellent 9.3

A large selection of movies, shows and music to choose from. Flight crews were attentive and friendly.

The narrow space between each rows for passengers to move from their seats.

SFO
LHR
Good 7.6

food was good, and tvs in the seats.

wifi didnt work, was the whole reason i took this airline. most international flights are cold it was very hot

SFO
LHR
Excellent 8.3

Good entertainment, food and in-flight crew

Because this flight was delayed it was a miracle (involving running til my throat literally bled) that I made my connection. Ground crew could not have been less helpful - even to my friend who they knew was trying to get home to attend a family funeral.

Fri, Dec 29
SFO
LHR
10h 30m
Thu, Jan 11
LHR
SFO
28h 20m
Trip: 14 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Feb 16
SFO
LHR
14h 20m
Sat, Feb 24
LHR
SFO
35h 29m
Trip: 9 days
8.3ExcellentShow reviews
Overall 8.3 Excellent
Based on 6 reviews
Overall
8.2
Boarding
8.2
Comfort
8.0
Crew
8.5
Entertainment
7.4
Food
7.6
SFO
LHR
Good 7.3

movie selection was good. sound was surprisingly good too. crew was efficient and friendly enough.

my seat wouldn't stay back. pretty annoying on a red eye.

ZRH
VIE
Good 6.3

Food part was missing.

VIE
MXP
Excellent 8.0

Organized orderly boarding. Food was snack only. Flight crew was pleasant and helpful.

OTP
VIE
Excellent 8.8

I wanted to buy an checked-in luggage, but Austrian site did not worked properly, repeatedly gave an error message. I ended up buying it at the counter desk, in the airport, at a much higher price.

FRA
SZG
Okay 5.6

Crew was courteous

No information on delay given until boarded.

Sun, Apr 29
SFO
LHR
10h 25m
Sat, May 12
LHR
SFO
31h 15m
Trip: 14 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 26 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
SFO
LHR
Mediocre 3.0

I sat with nice people and was happy each seat had a screen but of coarse it didn't work

Seat and foot room was extremely cramped , and I'm 5"4 115 lbs, seat was horribly stiff and uncomfortable , the entertainment system broke throughout the plane an hour into flight, you never saw crew in less they were serving food, it was very very load , it was a pretty awful experience and I'm not looking forward to the flight home at all

SFO
LHR
Excellent 9.6

Having read horror stories online about booking with Kayak's partner Justfly, I was prepared for the worst (last-minute cancellations, partial refunds, all-around crummy service). Actually, my Finnair flight was great - it was operated by BA, so it was a nice new double-decker Airbus plane. It was maybe 3/4ths full, so I nearly had a row to myself - shoutout to the jerk who decided he was entitled to the aisle seat. The flight was smooth and easy and best of all, it cost a fraction of what the BA price for a one-way from SFO to LHR cost.

The food on BA continues to be meh, but what most people don't realize is that ALL airline food is meh, because your tastebuds don't work properly 30k feet in the air (it's a scientific fact).

SFO
LHR
Okay 5.3

The configuration of the seats are really awkward. Seems very interesting at a glance, but not so nice when you have to sit in it for 10 hours. The business class seats are very narrow. I'm pretty petite so it was okay for me, but I think an average or bigger than average person would have a hard time turning at all while the seat is in lie flat position. I had a window seat which gives you more privacy as long as you have the divider up between you and the passenger next to you. You are really arm length away from each other though. And! You can't have the divider down the entire time because they serve your meals by passing it over to you across your neighbor through the divider. The divider is also required to be down during taxi, take off and landing. So, I'd imagine it to be very awkward if you're sitting next to a total stranger. You also have to straddle over someone's legs if you want to get out of your seat to the bathroom if you have window seats.

SFO
LHR
Okay 5.3

No leg room, flight attentend ignored me twice and I had to get up to get a answer from him.

HEL
JFK
Excellent 10.0

excellent service, loads of attention, good gluten free food choices with a finnish twist

Sat, Jan 13
SFO
LGW
14h 10m
Wed, Jan 24
LGW
SFO
14h 45m
Trip: 12 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 1067 reviews
Overall
6.0
Boarding
6.4
Comfort
5.7
Crew
7.0
Entertainment
4.2
Food
4.7
KEF
FRA
Mediocre 2.0

No much

Terrible service

KEF
ORD
Excellent 10.0

How do you indicate that you had no food or entertainment.

No running track. Kidding. Long sits are tough on all. How about a mid flight exercise program? Thanks. Will fly again. Have told many of our good experience.

FRA
KEF
Excellent 8.0

Excellent value for the price. Very democratic, none of the Senator class bullshit. You are honest about what the money buys and what it doesn't.

Seat was not terrifically comfortable, but I have had worse.

KEF
BOS
Good 6.0

They boarded us through the gate and then we just waited on the walkway to the airplane since they weren't letting anyone in. Very frustrating. Flight was delayed.

YYZ
KEF
Mediocre 2.0

Nothing at all

Service there carryon system

Thu, Jan 18
SFO
LGW
14h 10m
Mon, Jan 22
LGW
SFO
14h 45m
Trip: 5 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 1067 reviews
Overall
6.0
Boarding
6.4
Comfort
5.7
Crew
7.0
Entertainment
4.2
Food
4.7
DUB
KEF
Excellent 10.0

very nice flight attendents

TLV
KEF
Okay 4.0

Flight was cheap and the crew were friendly.

So uncomfortable, little leg room, you have to pay for water. No free entertainment provided.

KEF
ORD
Excellent 8.0

Very helpful staff at Reykavik

very thin hard purple seats were very uncomfortable.

KEF
BOS
Good 6.0

They boarded us through the gate and then we just waited on the walkway to the airplane since they weren't letting anyone in. Very frustrating. Flight was delayed.

KEF
FRA
Mediocre 2.0

No much

Terrible service

Sat, Apr 14
SFO
LGW
14h 05m
Mon, Apr 30
LGW
SFO
14h 45m
Trip: 17 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 1067 reviews
Overall
6.0
Boarding
6.4
Comfort
5.7
Crew
7.0
Entertainment
4.2
Food
4.7
BWI
KEF
Excellent 10.0

Crews are helpful and friendly! Great price, half of my flights were on brand new equipment! Highly recommend this airline!

DUB
KEF
Excellent 10.0

very nice flight attendents

KEF
ORD
Excellent 8.0

Very helpful staff at Reykavik

very thin hard purple seats were very uncomfortable.

FRA
KEF
Excellent 8.0

Excellent value for the price. Very democratic, none of the Senator class bullshit. You are honest about what the money buys and what it doesn't.

Seat was not terrifically comfortable, but I have had worse.

TLV
KEF
Okay 4.0

Flight was cheap and the crew were friendly.

So uncomfortable, little leg room, you have to pay for water. No free entertainment provided.

Tue, Apr 24
SFO
LGW
23h 50m
Mon, Apr 30
LGW
SFO
14h 45m
Trip: 7 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 1067 reviews
Overall
6.0
Boarding
6.4
Comfort
5.7
Crew
7.0
Entertainment
4.2
Food
4.7
BWI
KEF
Excellent 10.0

Crews are helpful and friendly! Great price, half of my flights were on brand new equipment! Highly recommend this airline!

KEF
BOS
Good 6.0

They boarded us through the gate and then we just waited on the walkway to the airplane since they weren't letting anyone in. Very frustrating. Flight was delayed.

EWR
KEF
Okay 5.3

I liked the price of the flight... round trip to Iceland from NYC $300 not bad

Boarding process is unorganized in both Newark and Keflavik airports. Offer water!!!

KEF
FRA
Mediocre 2.0

No much

Terrible service

BOS
KEF
Excellent 8.0

cheap and clean with efficiency.

No TV game or movie.

Tue, May 1
SFO
LGW
14h 05m
Thu, May 17
LGW
SFO
13h 35m
Trip: 17 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 1067 reviews
Overall
6.0
Boarding
6.4
Comfort
5.7
Crew
7.0
Entertainment
4.2
Food
4.7
BOS
KEF
Excellent 8.0

cheap and clean with efficiency.

No TV game or movie.

EWR
KEF
Okay 5.3

I liked the price of the flight... round trip to Iceland from NYC $300 not bad

Boarding process is unorganized in both Newark and Keflavik airports. Offer water!!!

KEF
ORD
Excellent 10.0

How do you indicate that you had no food or entertainment.

No running track. Kidding. Long sits are tough on all. How about a mid flight exercise program? Thanks. Will fly again. Have told many of our good experience.

KEF
BOS
Good 6.0

They boarded us through the gate and then we just waited on the walkway to the airplane since they weren't letting anyone in. Very frustrating. Flight was delayed.

KEF
FRA
Mediocre 2.0

No much

Terrible service

Sat, Mar 3
SFO
LHR
10h 30m
Mon, Mar 19
LHR
SFO
15h 30m
Trip: 16 days
Overall 0.0 Poor
Based on 0 reviews
Sat, May 5
SFO
LGW
14h 05m
Mon, May 14
LGW
SFO
13h 35m
Trip: 10 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 1067 reviews
Overall
6.0
Boarding
6.4
Comfort
5.7
Crew
7.0
Entertainment
4.2
Food
4.7
BWI
KEF
Excellent 10.0

Crews are helpful and friendly! Great price, half of my flights were on brand new equipment! Highly recommend this airline!

TLV
KEF
Okay 4.0

Flight was cheap and the crew were friendly.

So uncomfortable, little leg room, you have to pay for water. No free entertainment provided.

BOS
KEF
Excellent 8.0

Good crew

First leg was 1 hr late

FRA
KEF
Excellent 8.0

Excellent value for the price. Very democratic, none of the Senator class bullshit. You are honest about what the money buys and what it doesn't.

Seat was not terrifically comfortable, but I have had worse.

DUB
KEF
Excellent 10.0

very nice flight attendents

Mon, Apr 30
SFO
LHR
10h 25m
Thu, May 17
LHR
SFO
15h 00m
Trip: 18 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 26 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
SFO
LHR
Excellent 9.3

Very pleasant and efficient crew

Departing 50 minutes late. However, most of the time was made up enroute

HEL
JFK
Excellent 10.0

excellent service, loads of attention, good gluten free food choices with a finnish twist

JFK
HEL
Good 6.3

Food was all right because the flight didn't depart from Finland and catering was from a non-Finnish supplier. Hurrah!

Stewardesses announced that only chicken is available, regardless of any special meal requests (vegetarian etc..). Eventually special meals were located, but not before passengers specifically demanding for them. WTF. Finnair generously pours you a half an glass of wine with meal, for anything more you have to pay for. Supposedly you can buy snacks with money, but there were no menus or pricelists to be found in the seat pockets. Touchscreen functions were barely working on my entertainment screen, the remote control didn't work altogether. WIFI didn't work at all.

SFO
LHR
Excellent 8.6

Good flight, really good new A380 aircraft, smooth nearly all the way, usual small seating space as on All airlines

Routine airline food.

ARN
HEL
Excellent 10.0

The service, the comfort of the plane. Great communication about turbulence.

Mon, Mar 5
SFO
LHR
10h 30m
Fri, Mar 16
LHR
SFO
15h 30m
Trip: 11 days
Overall 0.0 Poor
Based on 0 reviews
Mon, May 7
SFO
LGW
17h 30m
Mon, May 14
LGW
SFO
13h 35m
Trip: 8 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 1067 reviews
Overall
6.0
Boarding
6.4
Comfort
5.7
Crew
7.0
Entertainment
4.2
Food
4.7
DUB
KEF
Excellent 10.0

very nice flight attendents

BOS
KEF
Excellent 8.0

Good crew

First leg was 1 hr late

KEF
ORD
Excellent 10.0

How do you indicate that you had no food or entertainment.

No running track. Kidding. Long sits are tough on all. How about a mid flight exercise program? Thanks. Will fly again. Have told many of our good experience.

FRA
KEF
Excellent 8.0

Excellent value for the price. Very democratic, none of the Senator class bullshit. You are honest about what the money buys and what it doesn't.

Seat was not terrifically comfortable, but I have had worse.

KEF
FRA
Mediocre 2.0

No much

Terrible service

Tue, May 1
SFO
LHR
10h 25m
Thu, May 17
LHR
SFO
15h 00m
Trip: 17 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 26 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
SFO
LHR
Okay 5.3

It was relatively inexpensive. I didn't mind the food/

This flight was operated by BA. Seats were incredibly uncomfortable. When the guy in front of me reclined his head was practically in my lap. TV's were crappy and the in-flight selection was mediocre. In flights announcements were very loud through headphones.

SFO
LHR
Excellent 8.6

Good flight, really good new A380 aircraft, smooth nearly all the way, usual small seating space as on All airlines

Routine airline food.

HEL
JFK
Excellent 10.0

excellent service, loads of attention, good gluten free food choices with a finnish twist

SFO
LHR
Excellent 9.6

Having read horror stories online about booking with Kayak's partner Justfly, I was prepared for the worst (last-minute cancellations, partial refunds, all-around crummy service). Actually, my Finnair flight was great - it was operated by BA, so it was a nice new double-decker Airbus plane. It was maybe 3/4ths full, so I nearly had a row to myself - shoutout to the jerk who decided he was entitled to the aisle seat. The flight was smooth and easy and best of all, it cost a fraction of what the BA price for a one-way from SFO to LHR cost.

The food on BA continues to be meh, but what most people don't realize is that ALL airline food is meh, because your tastebuds don't work properly 30k feet in the air (it's a scientific fact).

SFO
LHR
Okay 5.3

The configuration of the seats are really awkward. Seems very interesting at a glance, but not so nice when you have to sit in it for 10 hours. The business class seats are very narrow. I'm pretty petite so it was okay for me, but I think an average or bigger than average person would have a hard time turning at all while the seat is in lie flat position. I had a window seat which gives you more privacy as long as you have the divider up between you and the passenger next to you. You are really arm length away from each other though. And! You can't have the divider down the entire time because they serve your meals by passing it over to you across your neighbor through the divider. The divider is also required to be down during taxi, take off and landing. So, I'd imagine it to be very awkward if you're sitting next to a total stranger. You also have to straddle over someone's legs if you want to get out of your seat to the bathroom if you have window seats.

Tue, Mar 6
SFO
LHR
10h 30m
Fri, Mar 16
LHR
SFO
18h 20m
Trip: 10 days
Overall 0.0 Poor
Based on 0 reviews
Wed, May 2
SFO
LHR
10h 25m
Thu, May 17
LHR
SFO
15h 00m
Trip: 16 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 26 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
SFO
LHR
Mediocre 3.0

I sat with nice people and was happy each seat had a screen but of coarse it didn't work

Seat and foot room was extremely cramped , and I'm 5"4 115 lbs, seat was horribly stiff and uncomfortable , the entertainment system broke throughout the plane an hour into flight, you never saw crew in less they were serving food, it was very very load , it was a pretty awful experience and I'm not looking forward to the flight home at all

HEL
JFK
Excellent 10.0

excellent service, loads of attention, good gluten free food choices with a finnish twist

JFK
HEL
Good 6.3

Food was all right because the flight didn't depart from Finland and catering was from a non-Finnish supplier. Hurrah!

Stewardesses announced that only chicken is available, regardless of any special meal requests (vegetarian etc..). Eventually special meals were located, but not before passengers specifically demanding for them. WTF. Finnair generously pours you a half an glass of wine with meal, for anything more you have to pay for. Supposedly you can buy snacks with money, but there were no menus or pricelists to be found in the seat pockets. Touchscreen functions were barely working on my entertainment screen, the remote control didn't work altogether. WIFI didn't work at all.

ARN
HEL
Excellent 10.0

The service, the comfort of the plane. Great communication about turbulence.

SFO
LHR
Okay 5.3

It was relatively inexpensive. I didn't mind the food/

This flight was operated by BA. Seats were incredibly uncomfortable. When the guy in front of me reclined his head was practically in my lap. TV's were crappy and the in-flight selection was mediocre. In flights announcements were very loud through headphones.

Thu, Mar 8
SFO
LHR
10h 30m
Fri, Mar 16
LHR
SFO
15h 30m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Mar 3
SFO
LGW
14h 10m
Mon, Mar 19
LGW
SFO
14h 45m
Trip: 16 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 1067 reviews
Overall
6.0
Boarding
6.4
Comfort
5.7
Crew
7.0
Entertainment
4.2
Food
4.7
BOS
KEF
Excellent 8.0

cheap and clean with efficiency.

No TV game or movie.

KEF
ORD
Excellent 8.0

Very helpful staff at Reykavik

very thin hard purple seats were very uncomfortable.

KEF
BOS
Good 6.0

They boarded us through the gate and then we just waited on the walkway to the airplane since they weren't letting anyone in. Very frustrating. Flight was delayed.

EWR
KEF
Okay 5.3

I liked the price of the flight... round trip to Iceland from NYC $300 not bad

Boarding process is unorganized in both Newark and Keflavik airports. Offer water!!!

KEF
ORD
Excellent 10.0

How do you indicate that you had no food or entertainment.

No running track. Kidding. Long sits are tough on all. How about a mid flight exercise program? Thanks. Will fly again. Have told many of our good experience.

Show more results
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an and someone from our team will get back to you promptly.

^
The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.