Question 1

What is the cheapest airline that flies from London to San Francisco?

Accepted Answer

British Airways, United Airlines, and Lufthansa are the most popular carriers operating from London to San Francisco

Question 2

What is the cheapest time of day to depart on your flight to San Francisco?

Accepted Answer

According to our data, the cheapest time of day to fly to San Francisco is in the morning. momondo users have found flights departing from London to San Francisco in the morning for as low as €527. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are €875 on average. Flights to San Francisco from London in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Question 3

How have London to San Francisco flight prices changed over time?

Accepted Answer

As of December 2025, prices for London to San Francisco flights are approximately 3% more expensive when compared to flights at the same time last year.

Question 4

What is the most punctual flight time for London to San Francisco flights?

Accepted Answer

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

Question 5

What day of the week experiences the fewest flight delays on this route?

Accepted Answer

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Question 6

What is the cheapest London to San Francisco flight route?

Accepted Answer

Fly from London Heathrow to San Francisco for the best London - San Francisco flight prices

Question 7

How many flights depart from London to San Francisco on average per day?

Accepted Answer

As of December 2025, there are 31 flights per day flying from London to San Francisco. The most common time of day flights depart is 11:00, with 72% of flights taking off at midday.

Question 8

Can stopping save me money on London to San Francisco flights?

Accepted Answer

You could potentially save up to 32% on your flight if you consider stops on a London to San Francisco flight.

Question 9

How often are flights from London to San Francisco delayed?

Accepted Answer

Historically, on average around 13% of flights between London and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 141 minutes.

Question 10

What cabin class options are available on London to San Francisco flights?

Accepted Answer

There is only 1 cabin class available to choose from on London to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Question 11

What is the cheapest month to fly to San Francisco?

Accepted Answer

The cheapest month to fly to San Francisco from London is in September. Flight prices, which tend to average around €487, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to San Francisco from London during February instead. Flights to San Francisco in February, while not as cheap as those in September, still average around €489.

Question 12

What is the cheapest day to depart on your flight to San Francisco?

Accepted Answer

On average, the least expensive day to fly to San Francisco from London is on a Saturday. momondo users have found tickets for Saturday departures for as low as €533. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from London because it is more convenient for both business and leisure travellers. As a result, prices tend to be around €732.

Question 13

Which airline has the best punctuality record on London to San Francisco flights?

Accepted Answer

According to our data, Virgin Atlantic have had the fewest delays on this route over the last 12 months, with about 11% of their flights experiencing any sort of delay.

Question 14

How far in advance should I book a flight to San Francisco?

Accepted Answer

You are more likely to see cheaper flights to San Francisco from London when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around €579 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from London for as low as €545 on momondo.

Question 15

How many flights depart from London to San Francisco on average per week?

Accepted Answer

As of December 2025, there are 217 flights per week flying from London to San Francisco. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.

Question 16

When did momondo last update prices for flights from London to San Francisco Airport?

Accepted Answer

Prices for flights from London to San Francisco Airport were last updated today.

Question 17

How old do you have to be to fly from London to San Francisco Airport?

Accepted Answer

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from London to San Francisco Airport.

Question 18

What documentation or ID do you need to fly to San Francisco Airport?

Accepted Answer

The travel and health documents you'll need for your trip to San Francisco Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at San Francisco Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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Cheap flights from London to San Francisco from €421

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to San Francisco departing on 27/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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How to get the cheapest flight ticket from London to San Francisco

What is the cheapest month to fly to San Francisco?

What is the cheapest day to depart on your flight to San Francisco?

What is the cheapest time of day to depart on your flight to San Francisco?

What is the cheapest London to San Francisco flight route?

Fly from London Heathrow to San Francisco for the best London - San Francisco flight prices

How far in advance should I book a flight to San Francisco?

What cabin class options are available on London to San Francisco flights?

There is only 1 cabin class available to choose from on London to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to San Francisco flights?

You could potentially save up to 32% on your flight if you consider stops on a London to San Francisco flight.

How have London to San Francisco flight prices changed over time?

As of December 2025, prices for London to San Francisco flights are approximately 3% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from London to San Francisco?

British Airways, United Airlines, and Lufthansa are the most popular carriers operating from London to San Francisco

How often are flights from London to San Francisco delayed?

Historically, on average around 13% of flights between London and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 141 minutes.

What is the most punctual flight time for London to San Francisco flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on London to San Francisco flights?

According to our data, Virgin Atlantic have had the fewest delays on this route over the last 12 months, with about 11% of their flights experiencing any sort of delay.

How many flights depart from London to San Francisco on average per day?

As of December 2025, there are 31 flights per day flying from London to San Francisco. The most common time of day flights depart is 11:00, with 72% of flights taking off at midday.

How many flights depart from London to San Francisco on average per week?

As of December 2025, there are 217 flights per week flying from London to San Francisco. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.

When to book flights from London to San Francisco

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