Question 1

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 €583 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 €536 on momondo.

Question 2

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 295 per week as of July 2025. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.

Question 3

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

Accepted Answer

As of July 2025, prices for London Heathrow Airport to San Francisco flights are approximately 6% more expensive when compared to flights at the same time last year.

Question 4

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 5

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

Accepted Answer

TAP AIR PORTUGAL, WestJet, and Finnair are the most popular carriers operating from London Heathrow to San Francisco

Question 6

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 €483, 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 November instead. Flights to San Francisco in November, while not as cheap as those in February, still average around €506.

Question 7

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

Accepted Answer

You could potentially save up to 68% on your flight if you consider stops on a London Heathrow Airport to San Francisco flight.

Question 8

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 Monday. momondo users have found tickets for Monday departures for as low as €501. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Thursday 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 €672.

Question 9

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

Accepted Answer

42 flights are operational daily from London Heathrow Airport to San Francisco as of July 2025. The most popular departure time for this route is 10:00, with 59% of flights per day taking off in the afternoon.

Question 10

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

Accepted Answer

There are 1 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 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 €515. 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 €672 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

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 13

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 14

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.

Best price found	€486
Fastest flight time	10h 55m
Direct flights	Every day
Airports in San Francisco	1 airport

Cheap flights from London Heathrow Airport to San Francisco from €422

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

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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 are 1 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 68% 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 July 2025, prices for London Heathrow Airport to San Francisco flights are approximately 6% more expensive when compared to flights at the same time last year.

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

TAP AIR PORTUGAL, WestJet, and Finnair are the most popular carriers operating from London Heathrow to San Francisco

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

42 flights are operational daily from London Heathrow Airport to San Francisco as of July 2025. The most popular departure time for this route is 10:00, with 59% of flights per day taking off in the afternoon.

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 295 per week as of July 2025. 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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How far is London Heathrow to San Francisco by plane?

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

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

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

What is the most popular plane model from London Heathrow Airport to San Francisco?

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Why should I use momondo to find a flight deal from London to San Francisco?

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