Cheap flights from San Francisco to London from $494

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 20/1. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — LON
3 Sep — 10 Sep1
1 adult

Cheapflights Tip: The best prices from San Francisco to London are usually found in October or September, booked 38 days in advance, depart on a Monday or Tuesday and return on a Wednesday

Cheap flight deals from San Francisco to London

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to London (LON). 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 29 August 2025.

Round-trip from

$794

One-way from

$494

Popular in

June

Cheapest in

October

Average price

$1,099

Good one-way deal

$614 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 20/10-27/10
  • 2 total stops
  • 45h 40m total
  • San Francisco to London
20/1
  • 20/1
  • 1 total stop
  • 18h 15m total
  • San Francisco to London
Highest demand for flights based on searches. 16% potential increase in price ($346 potential increase over avg. return price).
Cheapest flight prices on average. 3% potential price decrease ($61 potential savings vs. average return price).
Average for round-trip flights in August 2025
Price to beat on a one-way flight from San Francisco to London (LON).

Find flight deals from San Francisco to London

Cheapest flights from San Francisco to London
Explore the most affordable flight options available from San Francisco to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 August 2025.

Thu 23/1019:40SFO - LHR
2 stops29h 55mScandinavian Airlines
Mon 3/1106:40LHR - SFO
1 stop15h 55mScandinavian Airlines
Deal found 26/8$799
Thu 23/1019:40SFO - LHR
2 stops29h 55mScandinavian Airlines
Sat 1/1115:35LHR - SFO
2 stops31h 00mScandinavian Airlines
Deal found 26/8$805
Sat 8/1116:40SFO - LHR
2 stops19h 15mScandinavian Airlines
Mon 10/1106:40LHR - SFO
2 stops24h 15mScandinavian Airlines
Deal found 27/8$806
Fri 24/1019:40SFO - LHR
2 stops30h 55mScandinavian Airlines
Mon 27/1006:40LHR - SFO
1 stop17h 55mScandinavian Airlines
Deal found 27/8$828
Mon 13/1019:40SFO - LHR
2 stops29h 15mScandinavian Airlines
Thu 16/1007:05LHR - SFO
2 stops17h 25mScandinavian Airlines
Deal found 27/8$842
Mon 13/1019:40SFO - LHR
1 stop18h 00mScandinavian Airlines
Fri 31/1019:50LHR - SFO
2 stops26h 45mScandinavian Airlines
Deal found 26/8$857
Tue 14/1019:40SFO - LHR
1 stop18h 00mScandinavian Airlines
Tue 28/1019:30LHR - SFO
1 stop27h 40mScandinavian Airlines
Deal found 27/8$878
Mon 10/1116:40SFO - LHR
2 stops15h 45mScandinavian Airlines
Mon 17/1106:40LHR - SFO
1 stop15h 55mScandinavian Airlines
Deal found 28/8$883
Mon 10/1116:40SFO - LHR
2 stops18h 10mScandinavian Airlines
Wed 19/1119:30LHR - SFO
1 stop27h 05mScandinavian Airlines
Deal found 27/8$884
Sat 8/1116:40SFO - LHR
2 stops18h 10mScandinavian Airlines
Sat 15/1115:35LHR - SFO
2 stops31h 00mScandinavian Airlines
Deal found 29/8$889

Cheapflights Fare Finder

 
Customise your flight search to find flights from San Francisco to London 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 647,157 searches. Data last updated 29 August 2025.
Use the filters below to find and compare flights from San Francisco to London that are best for you.

Fly from

San Francisco

Fly to

London

Route

Depart

Return

Price

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Sun 30/11

16:40-18:50

2 stops18h 10m

London Heathrow

Mon 8/12

06:40-14:35

1 stop15h 55m

$799

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Thu 6/11

16:40-18:50

2 stops18h 10m

London Heathrow

Fri 28/11

06:40-14:35

1 stop15h 55m

$799

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Thu 23/10

19:40-09:35

2 stops29h 55m

London Heathrow

Fri 31/10

19:30-15:35

1 stop27h 05m

$799

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Fri 24/10

19:40-10:35

2 stops30h 55m

London Heathrow

Mon 27/10

19:50-16:10

2 stops27h 20m

$802

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Sat 8/11

16:40-19:55

2 stops19h 15m

London Heathrow

Mon 10/11

06:40-22:55

2 stops24h 15m

$806

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Sat 8/11

16:40-21:40

1 stop21h 00m

London Heathrow

Sat 15/11

17:00-14:35

1 stop29h 35m

$809

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Sun 8/2

16:40-16:00

1 stop15h 20m

London Heathrow

Wed 25/2

19:30-14:35

1 stop27h 05m

$809

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Sun 9/11

16:40-18:30

1 stop17h 50m

London Heathrow

Wed 12/11

17:00-14:35

1 stop29h 35m

$809

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Fri 6/2

16:40-09:20

1 stop32h 40m

London Heathrow

Thu 19/2

06:40-14:35

1 stop15h 55m

$809

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Sat 7/2

16:40-16:00

1 stop15h 20m

London Heathrow

Fri 20/2

06:40-14:35

1 stop15h 55m

$809

Flights are sorted by cheapest return flights first.

Deals found on 26/8

Showing 1-10 of 22 results
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Best time to book a flight from San Francisco to London

Have a flexible travel schedule? Discover the best time to fly to London from San Francisco 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 San Francisco to London

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

Use this chart to determine the optimal time to book a return flight from San Francisco to London. Price data was last updated on 22 August 2025.

The best time to book flights from San Francisco to London is 38 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, October is the cheapest month in which you can book a flight from San Francisco to London (average of $1,037). Flying from San Francisco to London in December is currently the most expensive (average of $1,667). 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 SFO to LON?

Find hourly flight availability from San Francisco to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 August 2025.

When flying from San Francisco to London, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 13% versus a flight at midday.

Weekly flight availability from San Francisco to London

Explore weekly flight availability from San Francisco to London. 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 29 August 2025.

The most flights from SFO to LON are scheduled on a Wednesday (42 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (22 on average).

Related info for your journey

Find useful and relevant information for your journey from San Francisco to London. 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 from for flights from San Francisco to London?

    Located just 19.0 km from the city centre, San Francisco is the airport most travellers will use when flying to London from San Francisco. Booking flights from San Francisco (SFO) to London should be relatively easy as there are 36 daily outbound flights to London from 0 different airlines.

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

    Scandinavian Airlines can get you from San Francisco to London in just under 18h 10m. Your travel time can differ by up to . Airlines will cover a distance of 8610 km.

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

    Consider Iberia (90%), Aeromexico (88%) or American Airlines (87%) when booking your flight. These represent the most reliable airlines when flying from San Francisco to London.

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

    Looking for the cheapest flight from San Francisco to London? While on average our users pay $614, our data indicates the cheapest price to be $545. The most popular route (San Francisco - London Heathrow), is priced around $678.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from San Francisco to London 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 San Francisco to London?

    Currently, October is the cheapest month in which you can book a flight from San Francisco to London (average of $1,037). Flying from San Francisco to London in December is currently the most expensive (average of $1,667). 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

Travelling to a place near London?

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Deals for San Francisco to London flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from San Francisco to London.

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

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

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

Yes, Cheapflights offers price alerts on San Francisco to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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