Q: How much does it cost for a return flight from London Heathrow Airport to San Francisco?

Airfare is below average for this route at the moment. London Heathrow Airport to San Francisco flights typically cost between £603 and £428 in August. The cheapest return flight price found within the last 3 days was £428 on Scandinavian Airlines (28 Aug-11 Sept).

Question 1

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

Accepted Answer

Over the past year, United Airlines have had the lowest number of delays on this route, with just 10% of flights being delayed.

Question 2

What’s the cheapest stopover airport for flights from London Heathrow Airport to San Francisco?

Accepted Answer

Toronto (YYZ) is the most affordable one-stop option, with an average return flight price of £401.

Question 3

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

Accepted Answer

Tuesday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Question 4

How much does it cost for a return flight from London Heathrow Airport to San Francisco?

Accepted Answer

Airfare is below average for this route at the moment.London Heathrow Airport to San Francisco flights typically cost between £603 and £428 in August.
The cheapest return flight price found within the last 3 days was £428 on Scandinavian Airlines (28 Aug-11 Sept).

Question 5

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to San Francisco?

Accepted Answer

Flights via Amsterdam (AMS) offer the fastest connection on this route, with an average stopover time of 1h 07m.

Question 6

What’s the fastest stopover option from London Heathrow Airport to San Francisco?

Accepted Answer

Flights via Amsterdam (AMS) have the shortest average one-way travel time for one-stop routes: 13h 15m.

Question 7

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

Accepted Answer

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

Question 8

What’s the top stopover airport for flights from London Heathrow Airport to San Francisco?

Accepted Answer

Dublin (DUB) – chosen by Cheapflights users on 29% of one-stop itineraries from London Heathrow Airport to San Francisco on Cheapflights.

Question 9

How often are flights from London to San Francisco delayed?

Accepted Answer

About 11% of weekly flights between London and San Francisco have experienced delays in the past year, with the average delay time being 147 minutes.

Question 10

How long is the flight from London Heathrow Airport to San Francisco?

Accepted Answer

United Airlines, British Airways, and Delta can get you from London Heathrow Airport to San Francisco in just under 13h 15m. Your travel time can differ by up to 2h 20m. Airlines will cover a distance of 5350 mi. This flight may include one or multiple stops.

Question 11

What are the cheapest airlines flying from London Heathrow Airport to San Francisco round-trip?

Accepted Answer

Cheapflights users have booked flights from London Heathrow Airport to San Francisco round-trip from £318. Other airlines that can offer you cheap pricing are Air Canada, from £332, and SWISS, from £348. Delta is priced at 37% lower than the current average price of a flight leaving 3 months from now.

Question 12

What are the cheapest airlines to fly from London Heathrow Airport to San Francisco one-way?

Accepted Answer

To fly one-way, consider booking your trip with TAP AIR PORTUGAL, which is currently one of the cheapest options available, starting at £268. Virgin Atlantic flights start at £321 while deals on JetBlue start at £336 one-way.

Question 13

How far ahead should I book a flight from London Heathrow Airport to San Francisco?

Accepted Answer

The price you pay for your flight from London Heathrow Airport to San Francisco may vary depending on when you book. For the best chance of a lower fare, look to book 59 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Question 14

What is the cheapest month to book a flight from London Heathrow Airport to San Francisco?

Accepted Answer

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to San Francisco (average of £419). Flying from London Heathrow Airport to San Francisco in December is currently the most expensive (average of £649). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Question 15

Weekly flight availability from London Heathrow Airport to San Francisco

Accepted Answer

The most flights from LHR to SFO are scheduled on a Monday (42 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (25 on average).

Question 16

E

Accepted Answer

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 inches per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.

Question 17

E

Accepted Answer

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

Question 18

What are the cheapest flights from London Heathrow Airport to San Francisco?

Accepted Answer

The cheapest flight price from London Heathrow Airport to San Francisco is £390. On average you can expect to pay £1,156. The most popular route, (London Heathrow - San Francisco), can usually be booked for £401.

Question 19

What are the most reliable airlines from London Heathrow Airport to San Francisco?

Accepted Answer

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from London Heathrow Airport to San Francisco on time: Air Canada (87%), Austrian Airlines (87%), United Airlines (87%).

Question 20

What are the most popular airlines that fly from London Heathrow Airport to San Francisco?

Accepted Answer

The most popular airlines flying from London Heathrow Airport to San Francisco are Virgin Atlantic, British Airways and Lufthansa. Something to consider prior to booking your flight.

Question 21

What is the cheapest time of day to fly from LHR to SFO?

Accepted Answer

When flying from London Heathrow Airport to San Francisco, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Question 22

What airport do you fly into for flights to San Francisco from London Heathrow?

Accepted Answer

Located just 11.0 mi from the city center, San Francisco is the airport most travelers will use when flying to San Francisco from London Heathrow. Booking flights from London Heathrow to San Francisco (SFO) should be relatively easy as there are 35 daily inbound flights from London Heathrow from 18 different airlines.

Question 23

Can I find deals for flights from Heathrow to San Francisco that include hotel bookings?

Accepted Answer

Yes. In addition to deals on Heathrow to San Francisco flights, Cheapflights offers holiday packages that include both flights and hotel.

Question 24

How can I find direct flights from Heathrow to San Francisco?

Accepted Answer

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to San Francisco.

Question 25

Can I find deals for business class flights from Heathrow to San Francisco?

Accepted Answer

Yes. Cheapflights offers flight deals from Heathrow to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Question 26

How does Cheapflights help users find flights from Heathrow to San Francisco?

Accepted Answer

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to San Francisco from Heathrow today with Cheapflights!

Question 27

Why should you use Cheapflights to find cheap flight tickets from Heathrow to San Francisco?

Accepted Answer

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to San Francisco from Heathrow.

Question 28

Can Cheapflights find flights from Heathrow to San Francisco with no change fees?

Accepted Answer

Yes! Cheapflights helps users easily find flights from Heathrow to San Francisco with no change fees.

Question 29

Can Cheapflights notify me if prices for flights from Heathrow to San Francisco become cheaper?

Accepted Answer

Of course! You can now track prices for flights from Heathrow to San Francisco and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

Round-trip from	£428
One-way from	£399
Popular in	December
Cheapest in	February
Average price	£492
Good round-trip deal	£550 or less
Good one-way deal	£505 or less

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest£318	Average£663	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Air Canada	Cheapest£332	Average£411	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
SWISS	Cheapest£348	Average£425	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Aer Lingus	Cheapest£349	Average£556	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Scandinavian Airlines	Cheapest£353	Average£487	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
TAP AIR PORTUGAL	Cheapest£357	Average£463	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Brussels Airlines	Cheapest£369	Average£507	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
Lufthansa	Cheapest£371	Average£518	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Austrian Airlines	Cheapest£373	Average£494	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
Virgin Atlantic	Cheapest£374	Average£526	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights

Cheap flights from London Heathrow Airport to San Francisco from £399

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Heathrow to San Francisco

Cheapest flights from Heathrow to San FranciscoExplore the most affordable flight options available from Heathrow to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 April 2026.

Explore the most affordable flight options available from Heathrow to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 April 2026.

Best flights from Heathrow to San FranciscoDiscover carefully curated flight deals from Heathrow to San Francisco that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 April 2026.

Discover carefully curated flight deals from Heathrow to San Francisco that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 April 2026.

Direct flights from Heathrow to San FranciscoExplore direct flight options from Heathrow to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 28 April 2026.

Explore direct flight options from Heathrow to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 28 April 2026.

Last-minute flights from Heathrow to San FranciscoDiscover last-minute flight deals from Heathrow to San Francisco. Data last updated 28 April 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to San Francisco. Data last updated 28 April 2026 and is based on user searches.

One-way flights from Heathrow to San FranciscoSearch for one-way flight options from Heathrow to San Francisco. Find affordable one-way fares based on user searches. Data last updated 28 April 2026.

Search for one-way flight options from Heathrow to San Francisco. Find affordable one-way fares based on user searches. Data last updated 28 April 2026.

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Best time to book a flight from Heathrow to San Francisco

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Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to San Francisco

How far ahead should I book a flight from London Heathrow Airport to San Francisco?

What is the cheapest month to book a flight from London Heathrow Airport to San Francisco?

What is the cheapest time of day to fly from LHR to SFO?

How much does it cost for a return flight from London Heathrow Airport to San Francisco?

Weekly flight availability from London Heathrow Airport to San Francisco

How often are flights from London to San Francisco delayed?

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

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

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

What’s the top stopover airport for flights from London Heathrow Airport to San Francisco?

What’s the cheapest stopover airport for flights from London Heathrow Airport to San Francisco?

What’s the fastest stopover option from London Heathrow Airport to San Francisco?

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to San Francisco?

Reviews of airlines servicing San Francisco

See what other customers who have flown with Austrian Airlines,United Airlines, andVirgin Atlantic from London Heathrow Airport to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to San Francisco from London Heathrow?

How long is the flight from London Heathrow Airport to San Francisco?

What are the cheapest airlines flying from London Heathrow Airport to San Francisco round-trip?

What are the cheapest airlines to fly from London Heathrow Airport to San Francisco one-way?

What are the most reliable airlines from London Heathrow Airport to San Francisco?

What are the cheapest flights from London Heathrow Airport to San Francisco?

Can I find deals for flights from Heathrow to San Francisco that include hotel bookings?

How can I find direct flights from Heathrow to San Francisco?

Can I find deals for business class flights from Heathrow to San Francisco?

What is the cheapest month to book a flight from London Heathrow Airport to San Francisco?

Travelling to a place near San Francisco?

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Fly from Heathrow to San Francisco on these airlines

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Alternative routes for Heathrow to San Francisco

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Complete your trip

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Direct flights to California

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Search flights from Heathrow to San Francisco by cabin class

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Heathrow and San Francisco flights

Browse other Heathrow and San Francisco flight options. Last updated on 28 April 2026.

Other flights from Heathrow

Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 28 April 2026.

Popular flight searches

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Other flights to San Francisco

Explore flights to San Francisco departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 28 April 2026.

Top 10 airlines flying from Heathrow to San Francisco

Fly with Cheapflights

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How does Cheapflights help users find flights from Heathrow to San Francisco?

Why should you use Cheapflights to find cheap flight tickets from Heathrow to San Francisco?

Cheapest flights from Heathrow to San Francisco
Explore the most affordable flight options available from Heathrow to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 April 2026.

Best flights from Heathrow to San Francisco
Discover carefully curated flight deals from Heathrow to San Francisco that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 April 2026.

Direct flights from Heathrow to San Francisco
Explore direct flight options from Heathrow to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 28 April 2026.

Last-minute flights from Heathrow to San Francisco
Discover last-minute flight deals from Heathrow to San Francisco. Data last updated 28 April 2026 and is based on user searches.

One-way flights from Heathrow to San Francisco
Search for one-way flight options from Heathrow to San Francisco. Find affordable one-way fares based on user searches. Data last updated 28 April 2026.