Cheap flights from London Heathrow Airport to San Francisco from C$ 668

The cheapest month to fly to San Francisco from London Heathrow Airport is in February. Flight prices, which tend to average around C$ 771, are often lower during this time because this is during the off-season. The month of September is another great option to travel to San Francisco, with average flight prices from London Heathrow Airport averaging around C$ 795.

The cheapest day to depart from London Heathrow Airport to San Francisco is on a Thursday. Travellers who choose to depart for San Francisco on a Thursday will often find tickets for as low as C$ 795. On the other hand, Monday is the most expensive day to depart from London Heathrow Airport because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 1,850.

Flying to San Francisco from London Heathrow Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as C$ 976 when looking at flights departing in the afternoon. In contrast, the most expensive time of day to depart to San Francisco is in the morning when prices are around C$ 1,645.

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

You are more likely to see cheaper flights to San Francisco from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around C$ 931 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 Heathrow Airport for as low as C$ 874 on momondo.

There are 2 cabin classes available to choose from on London Heathrow to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to San Francisco.

As of February 2026, prices for London Heathrow Airport to San Francisco flights are approximately 33% more expensive when compared to flights at the same time last year.

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 148 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.

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

The number of flights available between London Heathrow Airport and San Francisco is 31 per day as of February 2026. The most frequent departure time is 11:00a.m., with 58% of daily flights leaving at noon.

The number of flights available between London Heathrow Airport 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.