Cheap flights from California to London from £243

In general, February is the cheapest month to fly from California to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £476. The month of August is another great option to travel to London Heathrow Airport, with average flight prices from California averaging around £491.

On average, the least expensive day to fly to London Heathrow Airport from California is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £539. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £653.

According to our data, the cheapest time of day to fly to London Heathrow Airport is at midday. momondo users have found flights departing from California to London Heathrow Airport at midday for as low as £567. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are £599 on average. Flights to London Heathrow Airport from California in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to London Heathrow Airport from California when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £612 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from California for as low as £552 on momondo.

British Airways, Delta, and LEVEL are the most popular carriers operating from California to London Heathrow

Virgin Atlantic, British Airways and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from California according to our data. Virgin Atlantic is the first choice among our users, with 45% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 12 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

114 flights are operational daily from California to London Heathrow Airport as of May 2026. The most popular departure time for this route is 20:00, with 51% of flights per day taking off in the evening.

As of May 2026, there are 798 flights per week flying from California to London Heathrow Airport. The most common day of the week flights depart is Mon, with 15% of flights taking off on this day.