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

Return flights

07 Sep - 16 Sep	Air Canada
22 Sep - 29 Sep	Air Canada
15 Sep - 07 Oct	United
07 Sep - 16 Sep	British Airways	direct
07 Sep - 22 Sep	Finnair	direct
15 Sep - 07 Oct	British Airways	direct
16 Sep - 07 Oct	British Airways	direct
16 Sep - 08 Oct	British Airways	direct
17 Sep - 02 Oct	Air Canada
17 Sep - 02 Oct	British Airways	direct
12 Sep - 02 Oct	Brussels Airlines
12 Sep - 02 Oct	Iberia	direct

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 $649

Return flights