Cheap flights from London to California from £343

If you are unable to visit California during the month of February, then departing from London during the month January is also very affordable. Most momondo users find prices during this month for around £494.

The cheapest day to depart on your flight to California is on a Thursday when prices can be found for as low as £524. This is often the case because there is less demand to fly during this day of the week. On the other hand, Sunday 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 £591.

The cheapest time of day to fly to California is in the morning when flights can be purchased for as low as £531. In contrast, the most expensive time of day to depart to California is in the afternoon when prices are around £567.

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

You are more likely to see cheaper flights to California from London when booking weeks ahead of your departure date. In general, you can expect to find flights to California for around £515 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to California from London for as low as £470 on momondo.

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

United Airlines, Alaska Airlines, and SWISS are the most popular carriers operating from London to California

British Airways, Virgin Atlantic and Lufthansa are the top three most popular airlines that fly to California from London according to our data. British Airways is the first choice among our users, with 40% of people opting to fly with this airline when travelling to California. Keep in mind that there are 20 different airlines that fly to California on a routine basis, so you have a few additional options to choose from.

The number of flights available between London and California is 79 per day as of November 2026. The most frequent departure time is 11:00, with 56% of daily flights leaving in the afternoon.

The number of flights available between London and California is 554 per week as of November 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.