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Cheap flights from London to San Francisco from £404

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
7 May — 14 May1
1 adult

Cheapflights Tip: The best prices from London to San Francisco are usually found in February or November, booked 60 days in advance, depart on a Tuesday or Friday 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 2 May 2025.

Round-trip from

£404

Popular in

July

Cheapest in

February

Average price

£466

Good round-trip deal

£480 or less

Good one-way deal

£450 or less
British Airways
  • British Airways
  • 9/9-16/9
  • 2 total stops
  • 27h 53m total
  • London to San Francisco
Highest demand for flights based on searches. 18% potential increase in price (£86 potential increase over avg. return price).
Cheapest flight prices on average. 3% potential price decrease (£12 potential savings vs. average return price).
Average for round-trip flights in May 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 2 May 2025.

Thu 8/510:45LHR - SFO
Nonstop11h 05mBritish Airways
Thu 22/516:20SFO - LHR
Nonstop10h 35mBritish Airways
Deal found 1/5£404
Wed 3/906:45LCY - SFO
1 stop17h 10mBritish Airways
Tue 23/917:45SFO - LCY
1 stop16h 35mBritish Airways
Deal found 1/5£404
Fri 9/506:30LHR - SFO
1 stop13h 15mDelta
Fri 16/513:00SFO - LHR
1 stop15h 35mDelta
Deal found 1/5£405
Wed 17/916:25LGW - SFO
1 stop30h 05mTAP AIR PORTUGAL
Thu 9/1016:20SFO - LGW
1 stop33h 25mTAP AIR PORTUGAL
Deal found 1/5£408
Sat 17/506:30LHR - SFO
1 stop13h 15mVirgin Atlantic
Sat 14/609:35SFO - LHR
1 stop15h 40mVirgin Atlantic
Deal found 1/5£411
Fri 9/515:05LGW - SFO
1 stop17h 01mBritish Airways
Wed 28/522:20SFO - LGW
1 stop25h 50mBritish Airways
Deal found 1/5£411
Thu 8/515:00LHR - SFO
1 stop16h 01mAmerican Airlines
Thu 22/513:35SFO - LHR
1 stop14h 55mAmerican Airlines
Deal found 1/5£413
Wed 3/908:40LCY - SFO
2 stops19h 38mVirgin Atlantic
Sat 13/913:45SFO - LCY
1 stop21h 55mVirgin Atlantic
Deal found 1/5£414
Thu 5/612:00LGW - SFO
1 stop16h 47mAir France
Sat 14/611:40SFO - LGW
1 stop14h 20mAir France
Deal found 1/5£414
Thu 8/506:15LHR - SFO
2 stops21h 22mFinnair
Sun 8/623:25SFO - LHR
2 stops23h 30mFinnair
Deal found 1/5£415
Wed 28/512:00LGW - SFO
1 stop16h 47mDelta
Wed 4/622:45SFO - LGW
1 stop27h 15mDelta
Deal found 1/5£416
Wed 28/515:05LGW - SFO
1 stop28h 43mAmerican Airlines
Thu 5/610:17SFO - LGW
1 stop13h 53mAmerican Airlines
Deal found 1/5£417

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 2 May 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

Tue 9/9

09:50-15:55

1 stop14h 05m

San Francisco

Tue 16/9

11:12-09:00

1 stop13h 48m

£404

LondonSan Francisco

LCY - SFO

LCYSFO

London City

Wed 3/9

06:45-15:55

1 stop17h 10m

San Francisco

Tue 23/9

17:45-18:20

1 stop16h 35m

£404

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Wed 17/9

16:25-14:30

1 stop30h 05m

San Francisco

Thu 9/10

16:20-09:45

1 stop33h 25m

£408

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 3/6

06:30-11:45

1 stop13h 15m

San Francisco

Fri 20/6

07:00-07:15

1 stop16h 15m

£408

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 14/5

08:40-20:10

2 stops19h 30m

San Francisco

Wed 21/5

08:29-11:50

1 stop19h 21m

£412

LondonSan Francisco

LCY - SFO

LCYSFO

London City

Wed 3/9

08:40-20:18

2 stops19h 38m

San Francisco

Sat 13/9

13:45-19:40

1 stop21h 55m

£414

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Thu 5/6

12:00-20:47

1 stop16h 47m

San Francisco

Sat 14/6

11:40-10:00

1 stop14h 20m

£414

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Wed 28/5

12:00-20:47

1 stop16h 47m

San Francisco

Wed 4/6

22:45-10:00

1 stop27h 15m

£416

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Wed 28/5

15:05-11:48

1 stop28h 43m

San Francisco

Thu 5/6

10:17-08:10

1 stop13h 53m

£417

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Mon 2/6

12:00-00:04

2 stops20h 04m

San Francisco

Mon 9/6

05:50-10:00

2 stops20h 10m

£417

Flights are sorted by cheapest return flights first.

Deals found on 1/5

Showing 1-10 of 60 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 25 April 2025.

To ensure you get the cheapest price possible for a flight from London to San Francisco, you should look to book at least 60 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 2 May 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 47% 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 2 May 2025.

The most flights from LON to SFO are scheduled on a Monday (42 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (36 on average).

Rainfall in San Francisco by month

Plan your trip to San Francisco by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 inches per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.

Temperature in San Francisco by month

Plan your trip to San Francisco by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

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 2 May 2025.
Get a feel of what it's like to fly with Delta, Air New Zealand and KLM from London to San Francisco by reading reviews from past customers. 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.

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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 41 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 British Airways is currently your cheapest option to San Francisco, with prices starting at £404. Additional return tickets that might be worth considering are offered by TAP AIR PORTUGAL and Virgin Atlantic, with the lowest prices starting at £408 and £408, respectively. British Airways is priced at 21% 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 Air New Zealand, which is currently one of the cheapest options available, starting at £448. Iberia flights start at £449 while deals on Aer Lingus start at £450 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 Canada (92%), Austrian Airlines (92%) or United Airlines (92%) 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 £412. On average you can expect to pay £1,501. The most popular route, (London Heathrow - San Francisco), can usually be booked for £360.

  • 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 New York?

    Times Square, New York City Center, and August Wilson Theater are currently the most popular points of interest in New York at the moment. Times Square, New York City Center, and August Wilson Theater can be accessed by travelling approximately 13.6 mi, 13.6 mi, and 13.7 mi, respectively from New York John F Kennedy Intl. Travellers can book a car hire at New York John F Kennedy Intl for about £52 per day to make their sightseeing more efficient.

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

    Tivoli, Opera House, and Højbro Plads are the most popular attractions in Copenhagen if you're in need of something to do during your stopover. 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. Those looking to explore during their stopover in Copenhagen can hire a car from Kastrup Copenhagen for about £29 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
Los Banos
Vallejo
Newark
South San Francisco
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 2 May 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 2 May 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£240Average£467FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapest£281Average£468FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
TAP AIR PORTUGALCheapest£348Average£470FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesCheapest£358Average£583FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Virgin AtlanticCheapest£362Average£490FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
SWISSCheapest£365Average£448FlexibilityNo cancel feeOn-time79%
Search SWISS flights
British AirwaysCheapest£366Average£499FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£371Average£599FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£374Average£468FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Brussels AirlinesCheapest£374Average£496FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights

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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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