Cheap flights from London to San Francisco from $543

If you aren’t able to travel to San Francisco during the month of February, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $596.

The cheapest day to depart from London to San Francisco is on a Thursday when prices can be found for as low as $751. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $896.

Our data shows that the cheapest London 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 $755. Flights in the morning are often more expensive with an average ticket price of $797.

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

You are more likely to see cheaper flights to San Francisco from London when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $718 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 for as low as $662 on momondo.

There are 4 cabin classes available to choose from on London 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 to San Francisco flight.

As of July 2026, prices for London to San Francisco flights are approximately 30% cheaper when compared to flights at the same time last year.

Aer Lingus, Lufthansa, and SWISS are the most popular carriers operating from London to San Francisco

British Airways, United Airlines and Lufthansa are the top three most popular airlines that fly to San Francisco from London according to our data. British Airways 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 11% of their flights experiencing any sort of delay.

Copenhagen (CPH) was the most common stop: 54% of momondo users choosing 1-stop flights on this route connected there.

Flights via Copenhagen (CPH) offer the lowest average round-trip price of $667.

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

Zurich (ZRH) has the shortest average layover time for this route: 1h 25m.

The number of flights available between London and San Francisco is 43 per day as of July 2026. The most frequent departure time is 10:00AM, with 56% of daily flights leaving in the afternoon.

As of July 2026, 302 flights take off from London and land in San Francisco each week. The most common flight departure day for this route is Mon, with 15% of weekly flights taking off on this day.