Question 1

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

Accepted Answer

According to our data, Wednesday is the cheapest day to fly to San Francisco from London Heathrow Airport. The lowest ticket price found for a Wednesday departure recently was $1,002. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to San Francisco for around $2,132.

Question 2

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 Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $1,016 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 Heathrow Airport for as low as $955 on momondo.

Question 3

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

Accepted Answer

You could potentially save up to 41% on your flight if you consider stops on a London Heathrow Airport to San Francisco flight.

Question 4

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

Accepted Answer

United Airlines, SWISS, and Finnair are the most popular carriers operating from London Heathrow to San Francisco

Question 5

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

Accepted Answer

As of January 2026, prices for London Heathrow Airport to San Francisco flights are approximately 11% cheaper when compared to flights at the same time last year.

Question 6

What is the cheapest month to fly to San Francisco?

Accepted Answer

If you aren’t able to travel during the month of February, then book flights to San Francisco from London Heathrow Airport during September instead. Flights to San Francisco in September, while not as cheap as those in February, still average around $864.

Question 7

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 8

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

Accepted Answer

There are 2 cabin classes available to choose from on London Heathrow 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 9

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 10

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 11

What is the cheapest London Heathrow to San Francisco flight route?

Accepted Answer

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

Question 12

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 Heathrow Airport to San Francisco in the morning for as low as $1,025. 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 at midday when prices are $2,048 on average. Flights to San Francisco from London Heathrow Airport at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

Accepted Answer

The number of flights available between London Heathrow Airport and San Francisco is 29 per day as of January 2026. The most frequent departure time is 11:00, with 57% of daily flights leaving at midday.

Question 15

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

Accepted Answer

As of January 2026, 207 flights take off from London Heathrow Airport and land in San Francisco each week. The most common flight departure day for this route is Mon, with 15% of weekly flights taking off on this day.

Question 16

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

Accepted Answer

Prices for flights from London Heathrow Airport to San Francisco Airport are refreshed on a daily basis.

Question 17

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

Accepted Answer

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport 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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How to get the cheapest flight ticket from London Heathrow Airport to San Francisco

What is the cheapest month to fly to San Francisco?

If you aren’t able to travel during the month of February, then book flights to San Francisco from London Heathrow Airport during September instead. Flights to San Francisco in September, while not as cheap as those in February, still average around $864.

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 Heathrow to San Francisco flight route?

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

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

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

There are 2 cabin classes available to choose from on London Heathrow 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 Heathrow Airport to San Francisco flights?

You could potentially save up to 41% on your flight if you consider stops on a London Heathrow Airport to San Francisco flight.

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

As of January 2026, prices for London Heathrow Airport to San Francisco flights are approximately 11% cheaper when compared to flights at the same time last year.

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

United Airlines, SWISS, and Finnair are the most popular carriers operating from London Heathrow 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 Heathrow Airport to San Francisco on average per day?

The number of flights available between London Heathrow Airport and San Francisco is 29 per day as of January 2026. The most frequent departure time is 11:00, with 57% of daily flights leaving at midday.

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

As of January 2026, 207 flights take off from London Heathrow Airport and land in San Francisco each week. The most common flight departure day for this route is Mon, with 15% of weekly flights taking off on this day.

When to book flights from London Heathrow Airport to San Francisco

Cheap London Heathrow Airport to San Francisco (LHR to SFO) flight deals and tips

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

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

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