Cheap flights from San Diego to London from £121

In general, February is the cheapest month to fly from San Diego to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £586. The month of January is another great option to travel to London Heathrow Airport, with average flight prices from San Diego averaging around £614.

On average, the least expensive day to fly to London Heathrow Airport from San Diego is on a Sunday. momondo users have found tickets for Sunday departures for as low as £425. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Friday is £1,011.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from San Diego to London Heathrow Airport in the afternoon for as low as £710. 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 £716 on average. Flights to London Heathrow Airport from San Diego in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to London Heathrow Airport from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £768 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 San Diego for as low as £659 on momondo.

There are 4 cabin classes available to choose from on San Diego to London Heathrow Airport 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 San Diego to London Heathrow Airport.

As of September 2026, prices for San Diego to London Heathrow Airport flights are approximately 22% cheaper when compared to flights at the same time last year.

As of September 2026, there are 9 flights per day flying from San Diego to London Heathrow Airport. The most common time of day flights depart is 19:00, with 66% of flights taking off in the evening.

As of September 2026, 63 flights take off from San Diego and land in London Heathrow Airport each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.