August is the cheapest month to fly this route, with average fares around $1155 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $1284 | $1241 | ||
| June 2026 | $1368 | $1201 | Peak | |
| July 2026 | $1273 | $1206 | ||
| August 2026 | $1155 | $1001 | Best |
Departing on Wednesday offers the lowest average fares at $1267. Sunday departures are the most expensive at $1338, a difference of $71.
The best time to fly is August. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from San Diego to London is August, with average round-trip fares around $1155. The lowest fare found in August is $1001.
Wednesday departures are the cheapest, averaging $1267 round trip. The most expensive day is Sunday at $1338.
Based on current pricing trends, booking for August travel offers the best value. Avoid June if possible, as fares average $1368 compared to $1155 in the cheapest month. May is a solid middle-ground option at $1284.
Flying in August instead of June can save you approximately $213 per round trip. The cheapest month averages $1155 while the most expensive averages $1368.
Airlines, flight times, price calendar, and more for San Diego to London
View SAN → LHR Details