Cheap flights from San Francisco to the United Kingdom from $316

In general, February is the cheapest month to fly from San Francisco to United Kingdom. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $642. If you aren’t able to travel to United Kingdom 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 $665.

The cheapest day to depart from San Francisco to United Kingdom is on a Wednesday when prices can be found for as low as $821. The most expensive day to fly to United Kingdom is Saturday, with ticket prices averaging around $949.

According to our data, the cheapest time of day to fly to United Kingdom is in the afternoon. momondo users have found flights departing from San Francisco to United Kingdom in the afternoon for as low as $865. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to United Kingdom are more costly at noon, with an average ticket price of $924. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to United Kingdom from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around $781 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from San Francisco for as low as $754 on momondo.

British Airways, American Airlines, and Air Canada are the most popular carriers operating from San Francisco to United Kingdom

United Airlines, British Airways and Virgin Atlantic are the top three most popular airlines that fly to United Kingdom from San Francisco according to our data. United Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to United Kingdom. Keep in mind that there are 21 different airlines that fly to United Kingdom on a routine basis, so you have a few additional options to choose from.

Historically, on average around 11% of flights between San Francisco and United Kingdom have experienced a delay on any given week. The average delay length over the past 12 months has been 155 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Monday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday 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 9% of their flights experiencing any sort of delay.

42 flights are operational daily from San Francisco to United Kingdom as of May 2026. The most popular departure time for this route is 4:00PM, with 59% of flights per day taking off in the afternoon.

As of May 2026, 294 flights take off from San Francisco and land in United Kingdom each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.