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Cheap flights from London to San Francisco from £391

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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
16 Jul — 23 Jul1
1 adult

Cheapflights Tip: The best prices from London to San Francisco are usually found in February or November, booked 86 days in advance, depart on a Thursday or Tuesday 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 11 July 2025.

Round-trip from

£395

One-way from

£391

Popular in

July

Cheapest in

February

Average price

£662

Good round-trip deal

£481 or less

Good one-way deal

£565 or less
SWISS
  • SWISS
  • 24/8-9/9
  • 2 total stops
  • 42h 25m total
  • London to San Francisco
Aer Lingus
  • Aer Lingus
  • 3/9
  • 1 total stop
  • 31h 05m total
  • London to San Francisco
Highest demand for flights based on searches. 18% potential increase in price (£81 potential increase over avg. return price).
Cheapest flight prices on average. 3% potential price decrease (£11 potential savings vs. average return price).
Average for round-trip flights in July 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

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 11 July 2025.

Sun 24/820:05LHR - SFO
1 stop28h 05mSWISS
Tue 9/919:30SFO - LHR
1 stop14h 20mSWISS
Deal found 10/7£395
Fri 12/918:40LGW - SFO
1 stop29h 55mSWISS
Mon 15/914:20SFO - LGW
1 stop19h 30mSWISS
Deal found 10/7£395
Sun 24/806:30LHR - SFO
1 stop14h 10mLufthansa
Tue 9/916:05SFO - LHR
Nonstop10h 20mLufthansa
Deal found 10/7£397
Mon 20/1016:25LGW - SFO
1 stop29h 10mTAP AIR PORTUGAL
Sat 1/1117:35SFO - LGW
1 stop33h 15mTAP AIR PORTUGAL
Deal found 10/7£397
Mon 6/1008:10LCY - SFO
1 stop16h 00mSWISS
Sat 18/1019:30SFO - LCY
1 stop15h 15mSWISS
Deal found 10/7£397
Sun 24/807:30LHR - SFO
1 stop16h 25mUnited Airlines
Tue 9/919:55SFO - LHR
Nonstop10h 15mUnited Airlines
Deal found 9/7£398
Tue 9/906:00LHR - SFO
2 stops21h 14mAustrian Airlines
Sun 21/907:00SFO - LHR
1 stop29h 40mAustrian Airlines
Deal found 11/7£400
Sun 24/820:05LHR - SFO
1 stop28h 05mMultiple Airlines
Tue 9/919:55SFO - LHR
Nonstop10h 15mMultiple Airlines
Deal found 9/7£400
Sat 6/910:25LGW - SFO
2 stops19h 07mMultiple Airlines
Sat 20/908:45SFO - LGW
1 stop16h 45mMultiple Airlines
Deal found 9/7£402
Tue 16/912:20LGW - SFO
2 stops18h 55mFinnair
Fri 26/906:00SFO - LGW
2 stops18h 35mFinnair
Deal found 9/7£403
Wed 3/914:15LHR - SFO
Nonstop11h 10mBritish Airways
Wed 1/1019:20SFO - LHR
Nonstop10h 25mBritish Airways
Deal found 9/7£405
Fri 19/908:40LHR - SFO
2 stops18h 58mAir Canada
Tue 23/908:30SFO - LHR
1 stop14h 00mAir Canada
Deal found 10/7£409

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 11 July 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

Sun 24/8

20:05-16:10

1 stop28h 05m

San Francisco

Tue 9/9

19:30-17:50

1 stop14h 20m

£395

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Fri 12/9

18:40-16:35

1 stop29h 55m

San Francisco

Mon 15/9

14:20-17:50

1 stop19h 30m

£395

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 24/8

06:30-12:40

1 stop14h 10m

San Francisco

Tue 9/9

16:05-10:25

Nonstop10h 20m

£397

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Mon 20/10

16:25-13:35

1 stop29h 10m

San Francisco

Sat 1/11

17:35-09:50

1 stop33h 15m

£397

LondonSan Francisco

LCY - SFO

LCYSFO

London City

Mon 6/10

08:10-16:10

1 stop16h 00m

San Francisco

Sat 18/10

19:30-18:45

1 stop15h 15m

£397

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 24/8

07:30-15:55

1 stop16h 25m

San Francisco

Tue 9/9

19:55-14:10

Nonstop10h 15m

£398

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 9/9

06:00-19:14

2 stops21h 14m

San Francisco

Sun 21/9

07:00-20:40

1 stop29h 40m

£400

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 24/8

20:05-16:10

1 stop28h 05m

San Francisco

Tue 9/9

19:55-14:10

Nonstop10h 15m

£400

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Sat 6/9

10:25-21:32

2 stops19h 07m

San Francisco

Sat 20/9

08:45-09:30

1 stop16h 45m

£402

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Tue 16/9

12:20-23:15

2 stops18h 55m

San Francisco

Fri 26/9

06:00-08:35

2 stops18h 35m

£403

Flights are sorted by cheapest return flights first.

Deals found on 9/7

Showing 1-10 of 48 results
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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 27 June 2025.

To ensure you get the cheapest price possible for a flight from London to San Francisco, you should look to book at least 86 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, February is the cheapest month in which you can book a flight from London to San Francisco (average of £538). Flying from London to San Francisco in July is currently the most expensive (average of £803). 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 11 July 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 49% 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 Tuesday evenings when fares are most often at their lowest. Sunday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from London to San Francisco

Explore weekly flight availability from London to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 11 July 2025.

The most flights from LON to SFO are scheduled on a Monday (43 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (37 on average).

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

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 11 July 2025.
Read reviews from past customers who have flown with Delta, Austrian Airlines, andFinnair 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.

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
8.0
Very Good

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 42 inbound flights from London per day. You should also have plenty of airline options to choose from since 17 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.

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

    Flying on SWISS is currently your cheapest option to San Francisco, with prices starting at £395. Additional return tickets that might be worth considering are offered by Lufthansa and TAP AIR PORTUGAL, with the lowest prices starting at £397 and £397, respectively. SWISS is priced at 20% 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 Aer Lingus, which is currently one of the cheapest options available, starting at £391. JetBlue flights start at £391 while deals on Scandinavian Airlines start at £400 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%), Air Canada (87%) or Austrian Airlines (87%) 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 £382. On average you can expect to pay £1,970. The most popular route, (London Heathrow - San Francisco), can usually be booked for £347.

  • 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, Opera House, and Højbro Plads are currently the most popular points of interest in Copenhagen at the moment. Tivoli, Opera House, and Højbro Plads can be accessed by travelling approximately 5.3 mi, 4.9 mi, and 5.1 mi, respectively from Kastrup Copenhagen. Travellers can book a car hire at Kastrup Copenhagen for about £46 per day to make their sightseeing more efficient.

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

    Chiado, Sé de Lisboa, and Londres are the most popular attractions in Lisbon if you're in need of something to do during your stopover. Chiado, Sé de Lisboa, and Londres can be accessed by travelling approximately 4.5 mi, 4.6 mi, and 2.3 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 £19 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, February is the cheapest month in which you can book a flight from London to San Francisco (average of £538). Flying from London to San Francisco in July is currently the most expensive (average of £803). 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 London?

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

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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 11 July 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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£235Average£481FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
TAP AIR PORTUGALCheapest£344Average£466FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
SWISSCheapest£347Average£403FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Scandinavian AirlinesCheapest£347Average£574FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
United AirlinesCheapest£353Average£565FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£357Average£479FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Brussels AirlinesCheapest£360Average£481FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
British AirwaysCheapest£360Average£497FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£366Average£455FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£366Average£454FlexibilityNo cancel feeOn-time75%
Search KLM 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!

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