Cheap flights from the United Kingdom to San Francisco from $347

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 $575.

The cheapest day to depart from United Kingdom to San Francisco is on a Thursday when prices can be found for as low as $669. The most expensive day to fly to San Francisco is Monday, with ticket prices averaging around $759.

Our data shows that the cheapest United Kingdom 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 $707. Flights in the morning are often more expensive with an average ticket price of $739.

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

You are more likely to see cheaper flights to San Francisco from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $682 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from United Kingdom for as low as $635 on momondo.

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

SWISS, United Airlines, and Lufthansa are the most popular carriers operating from United Kingdom to San Francisco

British Airways, United Airlines and Lufthansa are the top three most popular airlines that fly to San Francisco from United Kingdom according to our data. British Airways is the first choice among our users, with 53% of people opting to fly with this airline when traveling to San Francisco. Keep in mind that there are 13 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 United Kingdom and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 147 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.

As of February 2026, 31 flights take off from United Kingdom and land in San Francisco each day. The most common flight departure time for this route is 11:00AM, with 58% of daily flights taking off at noon.

The number of flights available between United Kingdom and San Francisco is 217 per week as of February 2026. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.