Cheap flights from San Diego to London from $252

The cheapest month to fly to London from San Diego is in October. Flight prices, which tend to average around $685, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from San Diego averaging around $713.

The cheapest day to depart from San Diego to London is on a Monday. Travelers who choose to depart for London on a Monday will often find tickets for as low as $839. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $929. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

Flying to London from San Diego in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $857 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $917. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to London from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $899 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from San Diego for as low as $731 on momondo.

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

JetBlue, SWISS, and Lufthansa are the most popular carriers operating from San Diego to London

British Airways, American Airlines and United Airlines are the top three most popular airlines that fly to London from San Diego according to our data. British Airways is the first choice among our users, with 59% of people opting to fly with this airline when traveling to London. Keep in mind that there are 11 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

New York (JFK) was the most common stop: 57% of momondo users choosing 1-stop flights on this route connected there.

Flights via Dallas (DFW) offer the lowest average round-trip price of $664.

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 12h 54m.

Seattle (SEA) has the shortest average layover time for this route: 1h 03m.

As of February 2026, there are 6 flights per day flying from San Diego to London. The most common time of day flights depart is 6:00PM, with 100% of flights taking off in the evening.

As of February 2026, there are 42 flights per week flying from San Diego to London. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.