Cheap Flights from London Heathrow (LHR) to San Francisco International (SFO)

Compare London Heathrow to San Francisco International flight deals

Find the cheapest month or even day of the year to fly to San Francisco International

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Flight deals from London Heathrow to San Francisco International

Looking for a cheap last-minute deal or the best return flight from London Heathrow Airport to San Francisco International Airport? If you want to travel next month, return fares start from £442. Find the lowest prices on one-way and return tickets right here.

San Francisco.£316 per passenger.Departing Thu, 20 May.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Thu, 20 May, arriving in San Francisco International.Price includes taxes and charges.From £316, select.

San Francisco.£320 per passenger.Departing Fri, 4 Sep.One-way flight with Finnair.Outbound direct flight with Finnair departs from London Heathrow on Fri, 4 Sep, arriving in San Francisco International.Price includes taxes and charges.From £320, select.

San Francisco.£322 per passenger.Departing Wed, 3 Feb.One-way flight with SWISS.Outbound indirect flight with SWISS, departs from London Heathrow on Wed, 3 Feb, arriving in San Francisco International.Price includes taxes and charges.From £322, select.

San Francisco.£323 per passenger.Departing Wed, 20 Jan.One-way flight with SWISS.Outbound indirect flight with SWISS, departs from London Heathrow on Wed, 20 Jan, arriving in San Francisco International.Price includes taxes and charges.From £323, select.

San Francisco.£324 per passenger.Departing Tue, 2 Mar.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Tue, 2 Mar, arriving in San Francisco International.Price includes taxes and charges.From £324, select.

San Francisco.£324 per passenger.Departing Wed, 2 Jun.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Wed, 2 Jun, arriving in San Francisco International.Price includes taxes and charges.From £324, select.

San Francisco.£324 per passenger.Departing Thu, 11 Feb.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Thu, 11 Feb, arriving in San Francisco International.Price includes taxes and charges.From £324, select.

San Francisco.£324 per passenger.Departing Mon, 2 Nov.One-way flight with SWISS.Outbound indirect flight with SWISS, departs from London Heathrow on Mon, 2 Nov, arriving in San Francisco International.Price includes taxes and charges.From £324, select.

San Francisco.£324 per passenger.Departing Wed, 26 Aug.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Wed, 26 Aug, arriving in San Francisco International.Price includes taxes and charges.From £324, select.

San Francisco.£324 per passenger.Departing Mon, 5 Oct.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Mon, 5 Oct, arriving in San Francisco International.Price includes taxes and charges.From £324, select.

San Francisco.£324 per passenger.Departing Tue, 12 Jan.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Tue, 12 Jan, arriving in San Francisco International.Price includes taxes and charges.From £324, select.

San Francisco.£324 per passenger.Departing Thu, 5 Nov.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Thu, 5 Nov, arriving in San Francisco International.Price includes taxes and charges.From £324, select.

San Francisco.£325 per passenger.Departing Tue, 1 Dec.One-way flight with SWISS.Outbound indirect flight with SWISS, departs from London Heathrow on Tue, 1 Dec, arriving in San Francisco International.Price includes taxes and charges.From £325, select.

San Francisco.£326 per passenger.Departing Tue, 1 Dec.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Tue, 1 Dec, arriving in San Francisco International.Price includes taxes and charges.From £326, select.

San Francisco.£327 per passenger.Departing Sat, 15 May.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Sat, 15 May, arriving in San Francisco International.Price includes taxes and charges.From £327, select.

San Francisco.£328 per passenger.Departing Tue, 6 Apr.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Tue, 6 Apr, arriving in San Francisco International.Price includes taxes and charges.From £328, select.

Find the cheapest month to fly from London Heathrow to San Francisco International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like London Heathrow to San Francisco International flights are currently cheapest in May.

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Direct flights from London Heathrow to San Francisco International

London Heathrow to San Francisco International: Alternative routes

Compare routes from London Heathrow to San Francisco below. You may find an airport to fly into that's cheaper, faster, or easier than San Francisco International.

London to San Francisco: Flight information

The things to know before you go.

Cheapest flight found	£316
Cheapest month to fly	May
Average flight time	11 hrs, 7 mins
Most popular airline	Lufthansa
Average flights per week	279

Finding cheap flights from London Heathrow to San Francisco International: Frequently asked questions

How much are return flights from London Heathrow to San Francisco International?

The best price we found for a return flight from London Heathrow to San Francisco International is £410. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from London Heathrow to San Francisco International?

11 hours and 7 minutes is the average flight time from London Heathrow to San Francisco International.

Which airlines fly direct from London Heathrow to San Francisco International?

Lufthansa, Air New Zealand and United fly direct from London Heathrow to San Francisco International.

How many flights are there a week from London Heathrow to San Francisco International?

As of June 2026, there are 279 flights per week flying from London Heathrow to San Francisco International.

When is the cheapest time to fly from London Heathrow to San Francisco International?

The cheapest month to fly from London Heathrow to San Francisco International is usually October.

Which upcoming date is cheapest to fly from London Heathrow Airport to San Francisco International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to San Francisco International Airport on Thursday, 22 October 2026.

Can I get a direct flight from London Heathrow Airport to San Francisco International Airport?

Yes – the average flight time is 11 hours and 7 minutes.

How can I find the best flight deal to San Francisco International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to San Francisco International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to San Francisco?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to San Francisco is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from London Heathrow Airport to San Francisco International with?

Currently, Air Canada and Finnair offer the cheapest flight tickets to San Francisco International.

Travelling from London Heathrow Airport (LHR) to San Francisco International Airport (SFO): what you need to know

Around 11 hours 5 minutes is how long you can expect to be travelling on a direct flight from London Heathrow Airport to San Francisco International Airport.
San Francisco is eight hours behind London and is in the UTC-8 timezone.
Flights from LHR to SFO start from 10:05 — the first with United Airlines. The last departure is at 16:25 with Virgin Atlantic. Overall, there are 41 weekly London Heathrow Airport to San Francisco International Airport flights.
Arriving two hours before an international flight and one hour ahead of a domestic departure are tried-and-true travel tips. Be at the airport on time to board your LHR to SFO flight.
Travelling during a peak time like July? Major public holidays and other popular periods can result in longer queues and delays at airport checkpoints. Play it safe and get there up to four hours ahead of international flights and two hours before domestic departures.
You can travel nonstop to San Francisco, the United States. Take off with one of these airlines that offer direct flights from London Heathrow Airport to San Francisco International Airport:
The majority of travellers choose to fly with United on this route.
Virgin Atlantic stands out as the most punctual carrier for LHR to SFO flights, with 88.33% of services reaching their destination on schedule.
Think about adding a stopover when booking your ticket from London Heathrow Airport to San Francisco International Airport. Just deselect 'Direct flights only' to break up your trip, or visit a new city along the way. Check out these options between LHR and SFO:
- Seattle / Tacoma International Airport
- Hong Kong Intl Airport
- Portland Airport

How to find the cheapest flights from London Heathrow Airport (LHR) to San Francisco International Airport (SFO)

£316 is the lowest price for a one-way London Heathrow Airport to San Francisco International Airport flight. Return flights start from £410. These fares can change based on demand.
To secure cheap tickets from LHR to SFO, book your trip five months before your departure.
The cheapest month for flights from London Heathrow Airport to San Francisco International Airport is October. Use the 'Whole month' tool to see the lowest prices if you have flexible travel dates.
Save time looking for cheap flights from LHR to SFO by creating a Price Alert. You'll get an email or notification through the app when a special offer becomes available.
Secure the right flight for you by using the filters. To see the 'Best,' 'Cheapest' or 'Fastest' flights from London Heathrow Airport to San Francisco International Airport, use the 'Sort by' function. You can also filter by departure and arrival times, airline, and journey duration.

Handy information about London Heathrow Airport (LHR)

78% of flights that take off from London Heathrow Airport reach their destination on schedule.
Central London to London Heathrow Airport is approximately 24 kms (15 miles). Depending on traffic, it'll take about 45 minutes to get there if you're ride-sharing, catching a taxi or driving.
Expect a trip time of around 25 minutes on public transport.
Taking an early flight from London Heathrow Airport to San Francisco International Airport? Avoid the last-minute rush to the airport (and get some extra shut-eye) by choosing one of these hotels close to LHR:

Arriving at San Francisco International Airport (SFO)

If you're coming in on a late London Heathrow Airport to San Francisco International Airport flight, nothing beats the convenience of being near the terminal. Grab your luggage from the carousel and then be showered and snoozing soon after at one of these accommodation options near SFO:
Pick up a San Francisco International Airport rental car and explore San Francisco and beyond with your own set of wheels. Dollar, Thrifty and Hertz are top providers you can book with here.
Booking your ride from San Francisco International Airport about one week in advance can help you get the best possible rate.

When to fly to San Francisco International Airport (SFO)

July is the busiest month for flights from London Heathrow Airport to San Francisco International Airport. To steer clear of the crowds, go to San Francisco in March.
Book your flight from London Heathrow Airport to San Francisco International Airport for September if you want to explore San Francisco during its warmest month. Expect temperatures of between 12ºC and 24ºC.
Look for cheap tickets from LHR to SFO in January if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between 5ºC and 16ºC on average.

Explore more of the United States

You've visited San Francisco, now it's time to discover other parts of the United States. Journey about 64 kms (40 miles) south-east to San Jose to tick off its popular sights. From Winchester Mystery House to The Tech Interactive and Santa Clara Valley, you've got a jam-packed schedule ahead.
If you're looking to explore another major destination in the United States, head for Fresno, roughly 257 kms (160 miles) south-east of San Francisco. Forestiere Underground Gardens, Shinzen Japanese Garden and Fresno Chaffee Zoo are key reasons to visit.