Question 1

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

Accepted Answer

Currently priced at £424, United Airlines will fly you from San Francisco to London Heathrow Airport and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from SWISS and Delta - these airlines can fly you to your destination from £425 and £427, respectively. Users have found that United Airlines is 25% cheaper than the other options available to this destination.

Question 2

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

Accepted Answer

To fly one-way, consider booking your trip with Air Canada, which is currently one of the cheapest options available, starting at £272. Air France flights start at £273 while deals on Vueling start at £273 one-way.

Question 3

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

Accepted Answer

Booking 78 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Francisco to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Question 4

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

Accepted Answer

Currently, January is the cheapest month in which you can book a flight from San Francisco to London Heathrow Airport (average of £112). Flying from San Francisco to London Heathrow Airport in August is currently the most expensive (average of £164). 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 San Francisco to London Heathrow Airport?

Accepted Answer

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

Question 6

Weekly flight availability from San Francisco to London Heathrow Airport

Accepted Answer

The most flights from SFO to LHR are scheduled on a Monday (42 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (32 on average).

Question 7

E

Accepted Answer

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Question 8

E

Accepted Answer

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July 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 4.0 C).

Question 9

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

Accepted Answer

On average you can expect to pay £1,861 for a flight from San Francisco to London Heathrow Airport. The cheapest flight overall is £264 while the most popular route, (San Francisco - London Heathrow) is currently priced at £298.

Question 10

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

Accepted Answer

Consider Air France (85%), Delta (85%) or Virgin Atlantic (85%) when booking your flight. These represent the most reliable airlines when flying from San Francisco to London Heathrow Airport.

Question 11

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

Accepted Answer

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

Question 12

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

Accepted Answer

Users have found that leaving on a Tuesday can be a cost-effective option. It’s possible to save up to 35% on your flight compared to booking on days when demand is much higher.

Question 13

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

Accepted Answer

Find a great deal and save up to 31% by booking at least 39 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from San Francisco to London Heathrow Airport within the next two weeks, with the cheapest ticket starting at £512.

Question 14

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

Accepted Answer

Our data shows that October tends to be the cheapest month to fly to London Heathrow Airport from San Francisco. Users have commonly found prices around £554 for the month, but tickets can be as low as £377. Due to multiple factors, prepare for potentially higher prices in June.

Question 15

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

Accepted Answer

When flying from San Francisco to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 30% versus a flight at midday.

Question 16

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

Accepted Answer

For a flight from San Francisco to London Heathrow, you will be flying from San Francisco. San Francisco (SFO) is just 11.8 mi from the center of the city. San Francisco is the only San Francisco airport and it handles 38 outbound flights to London Heathrow per day. 8 airlines have flights to London Heathrow from San Francisco on a regular basis.

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

Yes. Cheapflights offers flight deals from San Francisco to Heathrow 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 20

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

Accepted Answer

Cheapflights helps you search for flights from San Francisco to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Question 21

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

Accepted Answer

Cheapflights simply makes it quick and affordable to book flights from San Francisco to Heathrow by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Question 22

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

Accepted Answer

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

Question 23

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

Accepted Answer

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Heathrow from San Francisco today and book when prices fit your budget.

Round-trip from	£424
One-way from	£271
Popular in	June
Cheapest in	October
Average price	£690
Good round-trip deal	£433 or less
Good one-way deal	£285 or less

Airline	Cheapest	Average	Flexibility	On-time
TAP AIR PORTUGAL	Cheapest£384	Average£399	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Virgin Atlantic	Cheapest£403	Average£542	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Iberia	Cheapest£420	Average£532	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
British Airways	Cheapest£423	Average£522	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Air Canada	Cheapest£426	Average£600	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
KLM	Cheapest£434	Average£494	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£449	Average£662	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Lufthansa	Cheapest£472	Average£668	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights

Cheap flights from San Francisco to London Heathrow Airport from £271

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 19/7. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from San Francisco to London Heathrow are usually found in October or February, booked 78 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from San Francisco to Heathrow

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Find flight deals from San Francisco to Heathrow

Cheapest flights from San Francisco to HeathrowExplore the most affordable flight options available from San Francisco to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 July 2025.

Explore the most affordable flight options available from San Francisco to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 July 2025.

Cheapflights Fare Finder

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

Best time to book a flight from San Francisco to Heathrow

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

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a return flight from San Francisco to Heathrow. Price data was last updated on 27 June 2025.

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

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

Find hourly flight availability from San Francisco to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 3 July 2025.

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

Use this chart to determine the cheapest time to fly return from San Francisco to Heathrow. Price data was last updated on 29 June 2025.

Weekly flight availability from San Francisco to London Heathrow Airport

Explore weekly flight availability from San Francisco to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 3 July 2025.

Reviews of airlines servicing Heathrow

See what other customers who have flown with Delta, Austrian Airlines, andAir France from San Francisco to London Heathrow Airport 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 San Francisco to Heathrow. 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 from for flights from San Francisco to London Heathrow?

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

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

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

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

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

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

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

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

Travelling to a place near San Francisco?

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Alternative routes for San Francisco to Heathrow

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Top 8 airlines flying from San Francisco to Heathrow

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

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

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

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

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Cheapest flights from San Francisco to Heathrow
Explore the most affordable flight options available from San Francisco to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 July 2025.