San Francisco

$555+ Cheap flights from London (LON) to San Francisco (SFO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
Aug 5 — Aug 121
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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 Wednesday 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 July 31, 2025.

Round-trip from

$555
(SWISS)

Popular in

July

Cheapest in

February

Average price

$891

Good round-trip deal

$703 or less

Good one-way deal

$638 or less
From London (LON) to San Francisco
Highest demand for flights based on searches. 16% potential increase in price ($137 potential increase over avg. RT price).
Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT 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 July 31, 2025.

This SWISS deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/186:00 amLHR - SFO
2 stops41h 28mSWISS
Thu 9/257:30 pmSFO - LHR
1 stop18h 15mSWISS
Deal found 7/29$555
This SWISS deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:35 pmLGW - SFO
2 stops52h 53mSWISS
Tue 9/307:30 pmSFO - LGW
1 stop14h 20mSWISS
Deal found 7/30$556
This United Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/247:25 amLHR - SFO
1 stop14h 55mUnited Airlines
Tue 9/97:55 pmSFO - LHR
Nonstop10h 15mUnited Airlines
Deal found 7/29$557
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/510:55 amLGW - SFO
1 stop21h 04mMultiple Airlines
Thu 9/118:45 amSFO - LGW
1 stop18h 10mMultiple Airlines
Deal found 7/30$557
This Lufthansa deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:25 amLHR - SFO
1 stop15h 05mMultiple Airlines
Sat 9/207:30 pmSFO - LHR
1 stop14h 20mMultiple Airlines
Deal found 7/30$562
This Netflights deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/274:55 pmLHR - SFO
1 stop14h 21mBritish Airways
Sat 10/44:30 pmSFO - LHR
Nonstop10h 25mBritish Airways
Deal found 7/30$563
This oojo deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/104:25 pmLGW - SFO
1 stop30h 05mTAP AIR PORTUGAL
Wed 9/174:20 pmSFO - LGW
1 stop33h 25mTAP AIR PORTUGAL
Deal found 7/30$564
This Gotogate deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/216:40 pmLHR - SFO
1 stop29h 50mScandinavian Airlines
Wed 9/247:40 pmSFO - LHR
1 stop18h 00mScandinavian Airlines
Deal found 7/30$566
This Mytrip deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/154:10 pmSTN - SFO
2 stops32h 20mMultiple Airlines
Mon 9/297:40 pmSFO - STN
2 stops18h 30mMultiple Airlines
Deal found 7/31$567
This Lufthansa deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:30 amLHR - SFO
1 stop14h 30mLufthansa
Sun 10/57:25 pmSFO - LHR
1 stop14h 15mLufthansa
Deal found 7/29$569
This TravelTrolley deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelTrolley is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/64:25 pmLHR - SFO
Nonstop11h 05mVirgin Atlantic
Tue 9/169:20 pmSFO - LHR
Nonstop10h 20mVirgin Atlantic
Deal found 7/29$570
This ChecknFly deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2712:00 pmLHR - SFO
1 stop17h 05mFinnair
Sat 10/1110:16 amSFO - LHR
1 stop13h 04mFinnair
Deal found 7/31$575

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated July 31, 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

Thu 9/18

6:00 am-3:28 pm

2 stops41h 28m

San Francisco

Thu 9/25

7:30 pm-9:45 pm

1 stop18h 15m

$555

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Mon 9/15

6:35 pm-3:28 pm

2 stops52h 53m

San Francisco

Tue 9/30

7:30 pm-5:50 pm

1 stop14h 20m

$556

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 8/24

7:25 am-2:20 pm

1 stop14h 55m

San Francisco

Tue 9/9

4:05 pm-10:25 am

Nonstop10h 20m

$557

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Fri 9/5

10:55 am-11:59 pm

1 stop21h 04m

San Francisco

Thu 9/11

8:45 am-10:55 am

1 stop18h 10m

$557

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 9/8

8:30 am-4:00 pm

1 stop15h 30m

San Francisco

Mon 9/22

1:05 pm-7:25 am

Nonstop10h 20m

$558

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 9/13

7:25 am-2:30 pm

1 stop15h 05m

San Francisco

Sat 9/20

7:30 pm-5:50 pm

1 stop14h 20m

$562

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 9/27

4:55 pm-11:16 pm

1 stop14h 21m

San Francisco

Sat 10/4

4:30 pm-10:55 am

Nonstop10h 25m

$563

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Wed 9/10

4:25 pm-2:30 pm

1 stop30h 05m

San Francisco

Wed 9/17

4:20 pm-9:45 am

1 stop33h 25m

$564

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 9/6

4:25 pm-7:30 pm

Nonstop11h 05m

San Francisco

Tue 9/16

9:20 pm-3:40 pm

Nonstop10h 20m

$570

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 9/27

12:00 pm-9:05 pm

1 stop17h 05m

San Francisco

Sat 10/11

10:16 am-7:20 am

1 stop13h 04m

$575

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 44 results
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The best insider tips for London to San Francisco flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your London to San Francisco trip
Airlines
British Airways

BA's Club Suite offers private pods with a door, ideal for long-haul comfort.


BA's World Traveller Plus offers extra seat width and legroom, perfect for long-haul flights.

United Airlines

United's Polaris Business Class features lie-flat seats and Saks Fifth Avenue bedding for ultimate comfort.


United's Premium Plus offers upgraded comfort with bigger seats and extra legroom on international flights.

Lufthansa

Lufthansa's Allegris cabins offer advanced comfort features, enhancing long-haul travel experience.


Lufthansa's Sleeper's Row allows spreading out across seats for added comfort on long flights.

Read more about Lufthansaby Blane Bachelor
Virgin Atlantic

Virgin's Upper Class offers lie-flat beds and a four-course meal for a luxurious experience.


Virgin's Economy Delight provides extra legroom and priority boarding, enhancing comfort and convenience.

Airports
LHR

Heathrow's strict security can delay you. Ensure all liquids are in one small bag to avoid long waits for manual screening.

Read more about LHRby Ramsey Qubein
SFO

Use BART for a cost-effective 40-minute trip from SFO to downtown San Francisco. Purchase a Clipper Card for easy fare payment.

Read more about SFOby Harriet Baskas
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on British Airways

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines and SFO

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Blane Bachelor

Blane Bachelor

Expert on Lufthansa and Virgin Atlantic

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

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 round-trip 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 round-trip flight from London to San Francisco. Price data was last updated on July 25, 2025.

The price you pay for your flight from London to San Francisco may vary depending on when you book. For the best chance of a lower fare, look to book 86 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from London to San Francisco (average of $276). Flying from London to San Francisco in June is currently the most expensive (average of $358). 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 July 31, 2025.

It’s optimal to fly from London to San Francisco in the evening. By choosing this option you can save up to 6% on the cost of your flight, compared to a flight in the morning.

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 July 31, 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 to fly round-trip 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 July 31, 2025.
See what other customers who have flown with Delta, Austrian Airlines, and SWISS from London to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.0
Very good

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

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
8.0
Very good

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

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

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

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

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

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

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

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

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

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?

    Located just 11.8 mi from the city center, San Francisco is the airport most travelers will use when flying to San Francisco from London. Booking flights from London to San Francisco (SFO) should be relatively easy as there are 42 daily inbound flights from London from 10 different airlines.

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

    SWISS, at $555, was found to be the cheapest airline from London to San Francisco.Alternate airlines to your destination round-trip include United Airlines and British Airways. You may be able to fly from London to San Francisco for 17% less than the average price by searching for these airlines.

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

    The cheapest airline one-way is Lufthansa, with whom users have recently found tickets for as low as $586. However, be on the lookout for offers from Iberia and Aer Lingus, as they are both options that can get you from London to San Francisco for a low price.

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

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

    No one likes to see their flight delayed. When booking a flight from London to San Francisco consider choosing Air New Zealand (87%), Air Canada (86%) or Austrian Airlines (86%) as they are the most reliable in getting you off to your destination on time.

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

    While on average a flight from London to San Francisco is generally $2,401, our data shows the cheapest flight currently is $571. When looking at the most popular route, (London Heathrow - San Francisco), you can expect to pay $462 for that flight.

  • 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 vacation 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, January is the cheapest month in which you can book a flight from London to San Francisco (average of $276). Flying from London to San Francisco in June is currently the most expensive (average of $358). 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.

See more FAQs

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Mountain View
Santa Cruz
South San Francisco
Livermore
Turlock
Manteca
Antioch
Hollister
Watsonville
Sunnyvale
Newark
Milpitas
Campbell
Foster City
Capitola
Santa Clara
San Leandro
Burlingame
Redwood City

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.

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 2,558,603 searches. Data last updated July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$511Average$655FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$543Average$688FlexibilityNo cancel feeOn-time69%
Brussels AirlinesCheapest$546Average$695FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$553Average$752FlexibilityNo cancel feeOn-time72%
DeltaCheapest$555Average$708FlexibilityNo cancel feeOn-timeN/A
Austrian AirlinesCheapest$564Average$735FlexibilityNo cancel feeOn-time78%
Scandinavian AirlinesCheapest$577Average$808FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$579Average$716FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$594Average$747FlexibilityNo cancel feeOn-time71%
IberiaCheapest$596Average$759FlexibilityNo cancel feeOn-time77%

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