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

A quick flight from London Heathrow Airport to San Francisco can take about 19h 15m. United Airlines provides one of the quickest options available for as low as $524. The distance between London Heathrow Airport and San Francisco is about 5350 mi.

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

According to our current data, British Airways ($509), Brussels Airlines ($530), and Austrian Airlines ($539) offers the cheapest pricing from London Heathrow Airport to San Francisco. British Airways is priced at 23% lower than the current average price of a flight leaving 3 months from now.

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

To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at $474. Finnair flights start at $497 while deals on Delta start at $499 one-way.

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

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

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

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to San Francisco (average of $276). Flying from London Heathrow Airport to San Francisco in June is currently the most expensive (average of $357). 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.

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

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

Weekly flight availability from London Heathrow Airport to San Francisco

The most flights from LHR to SFO 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 (36 on average).

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.

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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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

While on average a flight from London Heathrow Airport to San Francisco is generally $2,055, our data shows the cheapest flight currently is $536. When looking at the most popular route, (London Heathrow - San Francisco), you can expect to pay $469 for that flight.

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

The top 3 most reliable airlines when flying from London Heathrow Airport to San Francisco are KLM (86%), Air France (86%) and Delta (86%).

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

American Airlines, British Airways and Delta are the most popular airlines when flying from London Heathrow Airport to San Francisco.

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

When flying from London Heathrow Airport to San Francisco, 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 3% versus a flight in the morning.

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

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 41 daily inbound flights from London Heathrow from 10 different airlines.

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

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

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

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.

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

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.

$458+ Cheap Flights from London Heathrow Airport to San Francisco

Round-trip from	$520 (Air Canada)
One-way from	$458 (FlightHub)
Popular in	July
Cheapest in	February
Average price	$581
Good round-trip deal	$603 or less
Good one-way deal	$619 or less

Lufthansa's Allegris cabins enhance comfort with adjustable headrests and slim seat design.

Lufthansa's Sleeper's Row offers extra space with a mattress and blanket for long-haul flights.

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest$509	Average$663	FlexibilityNo cancel fee	On-time70%
Brussels Airlines	Cheapest$530	Average$692	FlexibilityNo cancel fee	On-timeN/A
Austrian Airlines	Cheapest$539	Average$736	FlexibilityNo cancel fee	On-time78%
United Airlines	Cheapest$541	Average$682	FlexibilityNo cancel fee	On-time69%
Virgin Atlantic	Cheapest$550	Average$736	FlexibilityNo cancel fee	On-time72%
Delta	Cheapest$555	Average$708	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$578	Average$808	FlexibilityNo cancel fee	On-time77%
Lufthansa	Cheapest$579	Average$712	FlexibilityNo cancel fee	On-time76%
American Airlines	Cheapest$596	Average$748	FlexibilityNo cancel fee	On-time71%
Iberia	Cheapest$596	Average$762	FlexibilityNo cancel fee	On-time77%

$458+ Cheap flights from Heathrow (LHR) to San Francisco (SFO)

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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from London Heathrow to San Francisco are usually found in February or November, booked 82 days in advance, depart on a Thursday or Wednesday and return on a Wednesday

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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 September 17, 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 September 17, 2025.

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The best insider tips for London Heathrow Airport to San Francisco flights

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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?

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?

Weekly flight availability from London Heathrow Airport to San Francisco

Reviews of airlines servicing San Francisco

Get a feel of what it's like to fly with Delta, United Airlines, and Iberia from London Heathrow Airport to San Francisco by reading reviews from past customers. Users have also rated airlines 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?

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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 September 17, 2025.