Cheap flights from London to San Francisco from $492

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 $574.

The cheapest day to depart from London to San Francisco is on a Thursday when prices can be found for as low as $701. The most expensive day to fly to San Francisco is Saturday, with ticket prices averaging around $771.

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 $720. Flights in the morning are often more expensive with an average ticket price of $764.

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 $683 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 $614 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.

Lufthansa, SWISS, and JetBlue 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 39% of people opting to fly with this airline when traveling to San Francisco. Keep in mind that there are 14 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 11% 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 144 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.

Tuesday 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, Virgin Atlantic have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

Copenhagen (CPH) was the most common stop: 75% 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 Copenhagen (CPH) have the shortest average one-way travel time: 15h 20m.

Copenhagen (CPH) has the shortest average layover time for this route: 4h 01m.

The number of flights available between London and San Francisco is 37 per day as of April 2026. The most frequent departure time is 11:00AM, with 58% of daily flights leaving at noon.

As of April 2026, 259 flights take off from London and land in San Francisco each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.