Cheap flights from London to San Francisco from £341

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/1. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
23 Nov — 30 Nov1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London to San Francisco are usually found in September or February, booked 51 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap flight deals from London to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 24 October 2025.

Round-trip from

£383

One-way from

£341

Popular in

July

Cheapest in

September

Average price

£490

Good round-trip deal

£486 or less

Good one-way deal

£452 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 25/11-3/12
  • 2 total stops
  • 50h 05m total
  • London to San Francisco
21/1
  • 21/1
  • 1 total stop
  • 21h 10m total
  • London to San Francisco
Highest demand for flights based on searches. 14% potential increase in price (£63 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Average for round-trip flights in October 2025
Price to beat on a round-trip flight from London (LON) to San Francisco.
Price to beat on a one-way flight from London (LON) to San Francisco.

Find flight deals from London to San Francisco

Enter your travel dates to find the best prices.

Cheapest flights from London to San Francisco
Explore the most affordable flight options available from London to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 October 2025.

Tue 25/1118:30LHR - SFO
1 stop28h 00mTAP AIR PORTUGAL
Wed 3/1216:35SFO - LHR
1 stop22h 05mTAP AIR PORTUGAL
Deal found 23/10£383
Sat 8/1106:00LHR - SFO
1 stop16h 45mTAP AIR PORTUGAL
Sat 15/1116:35SFO - LHR
1 stop36h 05mTAP AIR PORTUGAL
Deal found 23/10£389
Mon 24/1106:40LHR - SFO
1 stop15h 55mScandinavian Airlines
Mon 8/1216:40SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 23/10£397
Fri 5/1206:00LHR - SFO
1 stop18h 05mTAP AIR PORTUGAL
Mon 8/1216:35SFO - LHR
1 stop16h 55mTAP AIR PORTUGAL
Deal found 23/10£398
Thu 20/1117:30LHR - SFO
2 stops29h 05mScandinavian Airlines
Fri 5/1216:40SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 22/10£405
Wed 26/1108:30STN - SFO
2 stops35h 20mMultiple Airlines
Wed 3/1215:40SFO - STN
2 stops21h 25mMultiple Airlines
Deal found 23/10£409
Sat 22/1106:40LHR - SFO
1 stop15h 55mScandinavian Airlines
Sat 6/1216:40SFO - LHR
1 stop17h 00mScandinavian Airlines
Deal found 23/10£413
Tue 25/1116:35LGW - SFO
1 stop29h 55mTAP AIR PORTUGAL
Fri 5/1219:10SFO - LGW
2 stops29h 10mTAP AIR PORTUGAL
Deal found 22/10£413
Wed 12/1106:00LHR - SFO
1 stop16h 30mTAP AIR PORTUGAL
Wed 14/116:35SFO - LHR
1 stop16h 55mTAP AIR PORTUGAL
Deal found 23/10£414
Wed 26/1108:50LGW - SFO
2 stops35h 00mMultiple Airlines
Wed 3/1215:40SFO - LGW
2 stops20h 15mMultiple Airlines
Deal found 23/10£414
Fri 21/1106:40LHR - SFO
1 stop15h 55mScandinavian Airlines
Sun 30/1116:40SFO - LHR
1 stop17h 00mScandinavian Airlines
Deal found 22/10£415
Mon 10/1106:40LHR - SFO
1 stop15h 55mScandinavian Airlines
Thu 13/1116:40SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 22/10£415

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to San Francisco that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 24 October 2025.
Use the filters below to find and compare flights from London to San Francisco that are best for you.

Fly from

London

Fly to

San Francisco

Route

Depart

Return

Price

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 14/11

06:40-14:35

1 stop15h 55m

San Francisco

Mon 24/11

16:40-16:00

1 stop15h 20m

£433

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 18/1

21:05-14:35

2 stops25h 30m

San Francisco

Fri 23/1

16:40-08:55

2 stops32h 15m

£442

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Mon 24/11

21:25-14:30

2 stops49h 05m

San Francisco

Mon 8/12

16:35-15:45

1 stop15h 10m

£451

LondonSan Francisco

STN - SFO

STNSFO

London Stansted

Sun 7/12

08:30-16:35

1 stop16h 05m

San Francisco

Sun 14/12

18:20-18:20

1 stop16h 00m

£453

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 13/3

21:05-15:35

2 stops25h 30m

San Francisco

Sat 21/3

17:40-18:50

2 stops18h 10m

£455

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 14/3

06:40-15:35

1 stop15h 55m

San Francisco

Sun 22/3

17:40-16:00

1 stop15h 20m

£456

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Mon 23/3

21:25-15:30

2 stops49h 05m

San Francisco

Fri 10/4

20:20-09:45

1 stop29h 25m

£462

LondonSan Francisco

LTN - SFO

LTNSFO

London Luton

Wed 14/1

06:50-15:35

1 stop16h 45m

San Francisco

Wed 21/1

17:20-17:05

1 stop15h 45m

£463

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 14/1

09:00-16:30

1 stop15h 30m

San Francisco

Mon 2/2

12:55-10:50

1 stop13h 55m

£466

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 21/1

09:00-16:30

1 stop15h 30m

San Francisco

Wed 28/1

11:45-16:20

2 stops20h 35m

£467

Flights are sorted by cheapest return flights first.

Deals found on 22/10

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from London to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from London with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

How far ahead should I book a flight from London to San Francisco?

Use this chart to determine the optimal time to book a return flight from London to San Francisco. Price data was last updated on 17 October 2025.

To ensure you get the cheapest price possible for a flight from London to San Francisco, you should look to book at least 51 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London to San Francisco?

Currently, December is the cheapest month in which you can book a flight from London to San Francisco (average of £340). Flying from London to San Francisco in July is currently the most expensive (average of £460). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LON to SFO?

Find hourly flight availability from London to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 24 October 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 9% on flights from London to San Francisco by exploring options for tickets in the evening.

What is the cheapest day to fly from London to San Francisco?

Use this chart to determine the cheapest time to fly return from London to San Francisco. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London to San Francisco flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost for a return flight from London to San Francisco?

What’s the top stopover airport for flights from London to San Francisco?

Share of one-stop return flights from London to San Francisco chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Copenhagen (CPH) – chosen by Cheapflights users on 34% of one-stop itineraries from London to San Francisco on Cheapflights.

What’s the cheapest stopover airport for flights from London to San Francisco?

Average return fare for one-stop flights from London to San Francisco, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Lisbon (LIS) is the most affordable one-stop option, with an average return flight price of £379.

What’s the fastest stopover option from London to San Francisco?

Shortest average travel time for one-stop one-way flights from London to San Francisco, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Amsterdam (AMS) have the shortest average one-way travel time for one-stop routes: 13h 17m.

Which airport typically offers the quickest stopover for flights from London to San Francisco?

Average stopover duration for one-stop one-way flights from London to San Francisco, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Amsterdam (AMS) offer the fastest connection on this route, with an average stopover time of 1h 06m.

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated 24 October 2025.
Read reviews from past customers who have flown with KLM, Virgin Atlantic, andUnited Airlines from London to San Francisco. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Overall

7.7

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Overall

7.7

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Overall

7.7

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Overall

7.7

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Overall

7.7

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Overall

7.7

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

Find useful and relevant information for your journey from London to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly into for flights to San Francisco from London?

    San Francisco (SFO) is the airport you will fly into if you book a flight from London to San Francisco. You should not have trouble finding flights to San Francisco from London; the airport handles an average of 19 inbound flights from London per day. You should also have plenty of airline options to choose from since 18 airlines have flights to the San Francisco airport from London. It is only a 11.8 mi journey from San Francisco (SFO) to San Francisco’s city center.

  • How long is the flight from London to San Francisco?

    There are many flights that can get you from London to San Francisco in 15h 30m. Fly via Scandinavian Airlines, TAP AIR PORTUGAL, or United Airlines to get the fastest option. London and San Francisco are separated by a distance of 5350 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London to San Francisco round-trip?

    Flying on Delta is currently your cheapest option to San Francisco, with prices starting at £239. Additional return tickets that might be worth considering are offered by Air Canada and Aer Lingus, with the lowest prices starting at £338 and £353, respectively. Delta is priced at 52% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from London to San Francisco one-way?

    To fly one-way, consider booking your trip with SWISS, which is currently one of the cheapest options available, starting at £348. British Airways flights start at £349 while deals on United Airlines start at £355 one-way.

  • What are the most popular routes from London to San Francisco?

  • What are the most reliable airlines from London to San Francisco?

    Consider Air New Zealand (87%), KLM (85%) or Air France (85%) when booking your flight. These represent the most reliable airlines when flying from London to San Francisco.

  • What are the cheapest flights from London to San Francisco?

    The cheapest flight price from London to San Francisco is £338. On average you can expect to pay £1,966. The most popular route, (London Heathrow - San Francisco), can usually be booked for £355.

  • Where are the most common stopover locations when flying from London to San Francisco?

  • What are some popular things to do or see while on a stopover in Copenhagen?

    Tivoli, Rådhuspladsen, and Opera House are currently the most popular points of interest in Copenhagen at the moment. Tivoli, Rådhuspladsen, and Opera House can be accessed by travelling approximately 5.3 mi, 5.2 mi, and 4.9 mi, respectively from Kastrup Copenhagen. Travellers can book a car hire at Kastrup Copenhagen for about £27 per day to make their sightseeing more efficient.

  • What are some popular points of interest to see during a stopover in Lisbon?

    Chiado, Londres, and Sé de Lisboa are the most popular attractions in Lisbon if you're in need of something to do during your stopover. Chiado, Londres, and Sé de Lisboa can be accessed by travelling approximately 4.5 mi, 2.3 mi, and 4.6 mi, respectively from Lisbon Humberto Delgado. Those looking to explore during their stopover in Lisbon can hire a car from Lisbon Humberto Delgado for about £12 per day.

  • Where are the least popular stopover locations for London to San Francisco flights?

  • Can I find deals for flights from London to San Francisco that include hotel bookings?

    Yes. In addition to deals on London to San Francisco flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to San Francisco?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to San Francisco.

  • Can I find deals for business class flights from London to San Francisco?

    Yes. Cheapflights offers flight deals from London to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, December is the cheapest month in which you can book a flight from London to San Francisco (average of £340). Flying from London to San Francisco in July is currently the most expensive (average of £460). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

  • What are the most eco-friendly airlines from London to San Francisco?

    If you are looking for flights to San Francisco from London that are eco-friendly, there are a couple of airlines that we can recommend. The recommended airlines are Brussels Airlines, Finnair, Jetblue and Singapore Airlines. If you choose to fly with Brussels Airlines, you will be flying with an airline that trains its pilots only to use one engine during taxiing and limited flaps while landing. This saves a lot of fuel. The fleet of aircraft for long-haul flights has also been replaced with models consuming 3.1% less fuel. Finnair is another great option for sustainable travel. They plan to cut their carbon emissions by 2025 by 50% from 2019’s level. This airline is also working on sustainable catering. Jetblue uses Airbus A320neos which improve fuel economy by 15%. This airline also uses Sharklets, which are wing tip devices that improve aerodynamics and reduce carbon emissions by 4%. Singapore Airlines is another great airline to fly with for eco-friendly travel. This airline is working on sustainable fuel and regularly replaces its planes with newer models that consume less fuel.

  • How to fly more sustainably from London to San Francisco?

    There are many great ways to travel more sustainably to San Francisco from London. One of the best ways you can do this is by taking a direct flight. Taking a direct flight uses less fuel than taking a flight route with more than one stopover. If you can, you should also fly in economy class. The economy class takes up less room in the aircraft and therefore can hold more passengers. Another great eco-friendly way to travel is by packing light. The lighter you pack, the less fuel the aircraft will use. Flying with an airline that has sustainable travel methods in place is super beneficial for the planet. If you have the option, try to fly with Brussels Airlines, Finnair, Jetblue or Singapore Airlines.

See more FAQs

Travelling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Newark
South San Francisco
Bodega Bay
Pacific Grove

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly from London to San Francisco on these airlines

Choose from the following airlines for your flight from London to San Francisco. Flights are based on user searches made on Cheapflights and were last updated on 24 October 2025.

Top 10 airlines flying from London to San Francisco

Discover the top 10 airlines that operate flights from London to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 24 October 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£239Average£496FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapest£338Average£497FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Aer LingusCheapest£353Average£565FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
TAP AIR PORTUGALCheapest£355Average£480FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesCheapest£358Average£523FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Brussels AirlinesCheapest£360Average£480FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
SWISSCheapest£360Average£442FlexibilityNo cancel feeOn-time79%
Search SWISS flights
United AirlinesCheapest£368Average£534FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£373Average£472FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Virgin AtlanticCheapest£375Average£508FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from London to San Francisco?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from London to San Francisco. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from London to San Francisco?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from London to San Francisco for you. Better yet — we are completely free to use.

Can Cheapflights find flights from London to San Francisco with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from London to San Francisco flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from London to San Francisco become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.