Question 1

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 2

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 3

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

Accepted Answer

You could potentially save up to 33% on your flight if you consider stops on a London Heathrow Airport to San Francisco flight.

Question 4

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

Accepted Answer

The number of flights available between London Heathrow Airport and San Francisco is 205 per week as of January 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.

Question 5

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 Heathrow Airport is on a Saturday. momondo users have found tickets for Saturday departures for as low as €540. 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 Heathrow Airport because it is more convenient for both business and leisure travellers. As a result, prices tend to be around €742.

Question 6

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 €586 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 €550 on momondo.

Question 7

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

Accepted Answer

29 flights are operational daily from London Heathrow Airport to San Francisco as of January 2026. The most popular departure time for this route is 11:00, with 60% of flights per day taking off at midday.

Question 8

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 9

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 10

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 11

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 €540. 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 €888 on average. Flights to San Francisco from London Heathrow Airport in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Question 12

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

Accepted Answer

There is only 1 cabin class 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 13

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 14

What is the typical price of a round-trip flight between London Heathrow Airport and San Francisco?

Accepted Answer

Prices are currently low for flights on this route.Typical prices usually range from €470 to €681.
The lowest price recently found on this route was €449.

Question 15

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

Accepted Answer

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

Question 16

What is the cheapest month to fly to San Francisco?

Accepted Answer

The cheapest month to fly to San Francisco from London Heathrow Airport is in February. Flight prices, which tend to average around €485, are often lower during this time because this is during the off-season. 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 €498.

Question 17

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 18

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

Accepted Answer

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London Heathrow Airport to San Francisco Airport.

Question 19

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

Accepted Answer

The required travel and health documents for your San Francisco Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's licence and a passport valid for six months after your intended arrival at San Francisco Airport. We recommend that you seek guidance from your airline or a reliable 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 typical price of a round-trip flight between London Heathrow Airport and 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 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 is only 1 cabin class 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 33% 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?

SWISS and United Airlines 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?

29 flights are operational daily from London Heathrow Airport to San Francisco as of January 2026. The most popular departure time for this route is 11:00, with 60% of flights per day taking off at midday.

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

The number of flights available between London Heathrow Airport and San Francisco is 205 per week as of January 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving 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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