AirHint found the following cheapest return flights from San Diego (SAN) to London (LHR) in September 2025 (see full year).

Return flights

22 Sep - 02 Oct	Air France
10 Sep - 22 Sep	Virgin Atlantic
10 Sep - 17 Sep	Virgin Atlantic
21 Sep - 01 Oct	Virgin Atlantic
27 Sep - 17 Oct	Air Canada
30 Sep - 07 Oct	British Airways
27 Sep - 07 Oct	British Airways
20 Sep - 03 Oct	Air France
12 Sep - 16 Sep	Delta
12 Sep - 17 Sep	Virgin Atlantic
24 Sep - 28 Sep	Air Canada
27 Sep - 18 Oct	Air Canada
28 Sep - 05 Oct	British Airways	direct
20 Sep - 11 Oct	Air Canada
29 Sep - 25 Oct	Air Canada
15 Sep - 26 Sep	Scandinavian Airlines
15 Sep - 22 Sep	Virgin Atlantic
17 Sep - 24 Sep	Virgin Atlantic
14 Sep - 21 Sep	Delta
11 Sep - 23 Sep	Air France

Also check the deals for one-way flights from San Diego to London 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 San Diego to London in September from $549

Return flights