Question 1

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 £402. Other airlines that can offer you cheap pricing are Scandinavian Airlines, from £403, and Lufthansa, from £403. KLM is priced at 24% lower than the current average price of a flight leaving 3 months from now.

Question 2

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 £387. WestJet flights start at £390 while deals on Aer Lingus start at £396 one-way.

Question 3

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 24 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Question 4

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 £538). Flying from London Heathrow Airport to San Francisco in July is currently the most expensive (average of £803). 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 5

What is the cheapest day to fly from London Heathrow Airport to San Francisco?

Accepted Answer

Travellers seeking maximum savings on their London Heathrow Airport to San Francisco flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

Question 6

Weekly flight availability from London Heathrow Airport to San Francisco

Accepted Answer

The most flights from LHR to SFO are scheduled on a Monday (37 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (37 on average).

Question 7

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 8

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 9

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 £406. On average you can expect to pay £1,803. The most popular route, (London Heathrow - San Francisco), can usually be booked for £312.

Question 10

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: American Airlines (91%), Aer Lingus (91%), Alaska Airlines (91%).

Question 11

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 American Airlines, Air Canada and Air France. Something to consider prior to booking your flight.

Question 12

Where are the most common stopover locations when flying from London Heathrow Airport to San Francisco?

Accepted Answer

Flights departing from London Heathrow Airport and landing in San Francisco stopover in Copenhagen most frequently. Lisbon is the second most popular location for stopovers on flights from London Heathrow Airport to San Francisco.

Question 13

Where are the least popular stopover locations for London Heathrow Airport to San Francisco flights?

Accepted Answer

London Heathrow Airport to San Francisco flights have a stopover in Dublin least often.

Question 14

What are some popular things to do or see while on a stopover in Copenhagen?

Accepted Answer

The majority of Copenhagen visitors spend their time at Tivoli, Opera House, and Højbro Plads. Tivoli, Opera House, and Højbro Plads can be visited by traveling about 5.3 mi, 4.9 mi, and 5.1 mi respectively from Kastrup Copenhagen. Those on a stopover in Copenhagen in need of a car hire can book one at Kastrup Copenhagen for about £26.

Question 15

What are some popular points of interest to see during a stopover in Lisbon?

Accepted Answer

Most Lisbon visitors opt to spend their time at Chiado, Sé de Lisboa, and Elevador de Santa Justa. Chiado, Sé de Lisboa, and Elevador de Santa Justa are located about 4.5 mi, 4.6 mi, and 4.4 mi, respectively from Lisbon Humberto Delgado. Those on a stopover in Lisbon in need of a car hire can book one at Lisbon Humberto Delgado for about £12.

Question 16

What is the cheapest day to fly round-trip from London Heathrow Airport to San Francisco?

Accepted Answer

Flights from London Heathrow Airport to San Francisco are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to San Francisco.

Question 17

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

Accepted Answer

Travelers have found it’s best to book a flight 61 days in advance to save up to 15% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 61 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London Heathrow Airport to San Francisco 1-2 weeks in advance for as low as £482, or £558 for flights within the next 24 hours.

Question 18

What is the cheapest month to fly from London Heathrow Airport to San Francisco?

Accepted Answer

February is one of the best times of the year to fly to San Francisco from London Heathrow Airport. Prices for February average £529 per person but you can even find prices for as low as £358. The most expensive prices can be found in the month of July. Opting for a February flight can save you 33% on your journey compared to booking in July

Question 19

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

Accepted Answer

It’s typically best to fly out from London Heathrow Airport to San Francisco in the evening. Doing so could potentially save you 47% on the flight price compared to flying at midday, which is usually more expensive.

Question 20

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

Accepted Answer

Located just 11.8 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 37 daily inbound flights from London Heathrow from 17 different airlines.

Question 21

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 22

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 23

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 24

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 25

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 26

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 27

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	£401
One-way from	£387
Popular in	July
Cheapest in	February
Average price	£476
Good round-trip deal	£464 or less
Good one-way deal	£511 or less

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest£246	Average£486	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Air Canada	Cheapest£289	Average£480	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
TAP AIR PORTUGAL	Cheapest£360	Average£480	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
SWISS	Cheapest£360	Average£427	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Scandinavian Airlines	Cheapest£367	Average£561	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Virgin Atlantic	Cheapest£374	Average£516	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£380	Average£503	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Brussels Airlines	Cheapest£384	Average£508	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
KLM	Cheapest£388	Average£506	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Austrian Airlines	Cheapest£388	Average£491	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights

Cheap flights from London Heathrow Airport to San Francisco from £387

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 15/6. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from London Heathrow to San Francisco are usually found in February or November, booked 56 days in advance, depart on a Tuesday or Friday and return on a Wednesday

Cheap flight deals from Heathrow to San Francisco

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Find 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 31 March 2025.

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 31 March 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to San Francisco that are best for you.

Best time to book a flight from Heathrow to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Heathrow with our price prediction graph.

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?

Use this chart to determine the optimal time to book a return flight from Heathrow to San Francisco. Price data was last updated on 28 March 2025.

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?

Find hourly flight availability from Heathrow to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 31 March 2025.

What is the cheapest day to fly from London Heathrow Airport to San Francisco?

Use this chart to determine the cheapest time to fly return from Heathrow to San Francisco. Price data was last updated on 23 March 2025.

Weekly flight availability from London Heathrow Airport to San Francisco

Rainfall in San Francisco by month

Plan your trip to San Francisco by taking into account the average rainfall totals by month.

Temperature in San Francisco by month

Plan your trip to San Francisco by taking into account the average temperature totals by month.

Reviews of airlines servicing San Francisco

Peruse reviews from past customers who have flown with Delta, KLM and Finnair from London to San Francisco to help guide your decision. 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?

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?

Where are the most common stopover locations when flying from London Heathrow Airport to San Francisco?

What are some popular things to do or see while on a stopover in Copenhagen?

What are some popular points of interest to see during a stopover in Lisbon?

Where are the least popular stopover locations for London Heathrow Airport to San Francisco flights?

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 London Heathrow Airport?

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Fly from Heathrow to San Francisco on these airlines

Choose from the following airlines for your flight from Heathrow to San Francisco. Flights are based on user searches made on Cheapflights and were last updated on 31 March 2025.

Top 10 airlines flying from Heathrow to San Francisco

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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?

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

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

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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 31 March 2025.