Cheap flights from London Heathrow Airport to San Francisco from $493

If you aren’t able to travel to San Francisco during the month of February, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $666.

The cheapest day to depart from London Heathrow Airport to San Francisco is on a Wednesday when prices can be found for as low as $745. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $876.

Our data shows that the cheapest London Heathrow Airport to San Francisco flights are usually those with departure times at noon. Our users have found flights to San Francisco at noon for as low as $757. Flights in the afternoon are often more expensive with an average ticket price of $810.

Fly from London Heathrow to San Francisco for the best London Heathrow - San Francisco flight prices

You are more likely to see cheaper flights to San Francisco from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $736 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from London Heathrow Airport for as low as $680 on momondo.

There are 4 cabin classes available to choose from on London Heathrow Airport to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 13% on your flight if you consider stops on a London Heathrow Airport to San Francisco flight.

As of September 2026, prices for London Heathrow Airport to San Francisco flights are approximately 27% cheaper when compared to flights at the same time last year.

SWISS and British Airways are the most popular carriers operating from London Heathrow to San Francisco

Lufthansa, United Airlines and British Airways are the top three most popular airlines that fly to San Francisco from London Heathrow Airport according to our data. Lufthansa is the first choice among our users, with 33% of people opting to fly with this airline when traveling to San Francisco. Keep in mind that there are 12 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.

Historically, on average around 12% of flights between London and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 143 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

Friday is statistically the day of the week which experiences the fewest number of delays on this flight route. Wednesday has historically seen more delays on average compared to the rest of the week.

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 12% of their flights experiencing any sort of delay.

Copenhagen (CPH) was the most common stop: 43% of momondo users choosing 1-stop flights on this route connected there.

Flights via Copenhagen (CPH) offer the lowest average round-trip price of $732.

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 14h 30m.

Dublin (DUB) has the shortest average layover time for this route: 1h 54m.

As of September 2026, 27 flights take off from London Heathrow Airport and land in San Francisco each day. The most common flight departure time for this route is 10:00AM, with 61% of daily flights taking off in the afternoon.

189 flights are operational weekly from London Heathrow Airport to San Francisco as of September 2026. The most popular departure day for this route is Mon, with 20% of flights per week taking off on this day.