Question 1

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

Accepted Answer

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from San Francisco to London Heathrow Airport in the evening for as low as £551. 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 £807 on average. Flights to London Heathrow Airport from San Francisco at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

Generally, flights departing at night tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Question 4

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

Accepted Answer

United Airlines, Virgin Atlantic, and American Airlines are the most popular carriers operating from San Francisco to London Heathrow

Question 5

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

Accepted Answer

You could potentially save up to 11% on your flight if you consider stops on a San Francisco to London Heathrow Airport flight.

Question 6

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

Accepted Answer

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

Question 7

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

Accepted Answer

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

Question 8

How often are flights from San Francisco to London delayed?

Accepted Answer

Historically, on average around 12% of flights between San Francisco and London have experienced a delay on any given week. The average delay length over the past 12 months has been 158 minutes.

Question 9

Which airlines fly to London Heathrow Airport?

Accepted Answer

United Airlines, Virgin Atlantic and British Airways are the top three most popular airlines that fly to London Heathrow Airport from San Francisco according to our data. United Airlines is the first choice among our users, with 34% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 7 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

Question 10

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

Accepted Answer

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

Question 11

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

Accepted Answer

According to our data, Virgin Atlantic have had the fewest delays on this route over the last 12 months, with about 9% of their flights experiencing any sort of delay.

Question 12

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

Accepted Answer

The number of flights available between San Francisco and London Heathrow Airport is 31 per day as of December 2025. The most frequent departure time is 17:00, with 80% of daily flights leaving in the afternoon.

Question 13

How far in advance should I book a flight to London Heathrow Airport?

Accepted Answer

You are more likely to see cheaper flights to London Heathrow Airport from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £577 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from San Francisco for as low as £546 on momondo.

Question 14

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

Accepted Answer

There are 4 cabin classes available to choose from on San Francisco to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Question 15

What is the cheapest day to depart on your flight to London Heathrow Airport?

Accepted Answer

On average, the least expensive day to fly to London Heathrow Airport from San Francisco is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £506. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Friday is £652.

Question 16

What is the cheapest month to fly to London Heathrow Airport?

Accepted Answer

In general, October is the cheapest month to fly from San Francisco to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £501. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from San Francisco averaging around £502.

Question 17

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

Accepted Answer

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

Question 18

How many operators does momondo search for flights from San Francisco Airport to London Heathrow Airport?

Accepted Answer

There are 7 operators available for flights from San Francisco Airport to London Heathrow Airport as of December 2025.

Question 19

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

Accepted Answer

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Airport to London Heathrow Airport.

Question 20

What documentation or ID do you need to fly to London Heathrow Airport?

Accepted Answer

The travel and health documents required for your trip to London Heathrow Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Heathrow Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best price found	£289
Fastest flight time	10h 10m
Direct flights	Every day

Airline	Rating	Free Cancellation	Price
Scandinavian Airlines	PriceFrom £359	Free Cancellation	Rating 7.4 1,591 reviews	Search Scandinavian Airlines flights
KLM	PriceFrom £368	Free Cancellation	Rating 7.7 1,428 reviews	Search KLM flights
Virgin Atlantic	PriceFrom £372	Free Cancellation	Rating 7.5 675 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom £390	Free Cancellation	Rating 6.7 7,559 reviews	Search British Airways flights
Lufthansa	PriceFrom £417	Free Cancellation	Rating 6.8 7,612 reviews	Search Lufthansa flights
United Airlines	PriceFrom £421	Free Cancellation	Rating 7.4 9,063 reviews	Search United Airlines flights
Iberia	PriceFrom £430	Free Cancellation	Rating 7.0 3,039 reviews	Search Iberia flights

Cheap flights from San Francisco to London from £289

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to London departing on 9/12. 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 San Francisco to London Heathrow Airport

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 London Heathrow Airport?

What is the cheapest day to depart on your flight to London Heathrow Airport?

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

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

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

How far in advance should I book a flight to London Heathrow Airport?

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

There are 4 cabin classes available to choose from on San Francisco to London Heathrow 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 San Francisco to London Heathrow Airport flights?

You could potentially save up to 11% on your flight if you consider stops on a San Francisco to London Heathrow Airport flight.

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

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

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

United Airlines, Virgin Atlantic, and American Airlines are the most popular carriers operating from San Francisco to London Heathrow

Which airlines fly to London Heathrow Airport?

How often are flights from San Francisco to London delayed?

Historically, on average around 12% of flights between San Francisco and London have experienced a delay on any given week. The average delay length over the past 12 months has been 158 minutes.

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

Generally, flights departing at night tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

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

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

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

According to our data, Virgin Atlantic have had the fewest delays on this route over the last 12 months, with about 9% of their flights experiencing any sort of delay.

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

The number of flights available between San Francisco and London Heathrow Airport is 31 per day as of December 2025. The most frequent departure time is 17:00, with 80% of daily flights leaving in the afternoon.

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

As of December 2025, there are 217 flights per week flying from San Francisco to London Heathrow Airport. 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 San Francisco to London Heathrow Airport

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

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

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

What documentation or ID do you need to fly to London Heathrow Airport?

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

Best airlines flying from San Francisco to London Heathrow Airport

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KLM Flights From San Francisco to London Heathrow Airport

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