Cheap flights from London to San Francisco from C$ 685

The cheapest month to fly to San Francisco from London is in February. Flight prices, which tend to average around C$ 814, are often lower during this time because this is during the off-season. The month of November is another great option to travel to San Francisco, with average flight prices from London averaging around C$ 925.

The cheapest day to depart from London to San Francisco is on a Wednesday. Travellers who choose to depart for San Francisco on a Wednesday will often find tickets for as low as C$ 794. On the other hand, Monday is the most expensive day to depart from London because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 1,878.

Flying to San Francisco from London in the morning is the least expensive time of day to depart. momondo users have found prices as low as C$ 1,662 when looking at flights departing in the morning. In contrast, the most expensive time of day to depart to San Francisco is at noon when prices are around C$ 2,254.

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 C$ 1,021 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 C$ 922 on momondo.

There are 2 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.

Historically, on average around 13% 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 departing in the evening have, in the past, seen delays more frequently in comparison.

Friday is statistically the day of the week that experiences the fewest 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 has had the least delays on this route over the last 12 months, with about 12% of their flights experiencing any sort of delay.

As of September 2026, 28 flights take off from London and land in San Francisco each day. The most common flight departure time for this route is 10:00a.m., with 64% of daily flights taking off in the afternoon.

200 flights are operational weekly from London to San Francisco as of September 2026. The most popular departure day for this route is Wed, with 19% of flights per week taking off on this day.