AirHint found the following cheapest return flights from London (LHR) to San Diego (SAN) in September 2026 (see full year).

Return flights

10 Sep - 19 Sep	Lufthansa
09 Sep - 16 Sep	Lufthansa
09 Sep - 14 Sep	Lufthansa
22 Sep - 30 Sep	Air Canada
09 Sep - 16 Sep	British Airways	direct
01 Sep - 11 Sep	Lufthansa
09 Sep - 14 Sep	British Airways	direct
22 Sep - 30 Sep	British Airways	direct
13 Sep - 17 Sep	Air Canada
25 Sep - 02 Oct	Air Canada
13 Sep - 17 Sep	British Airways	direct

Also check the deals for one-way flights from London to San Diego in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to San Diego in September from 485€

Return flights