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

Return flights

20 Oct - 27 Oct	Air Canada
15 Oct - 29 Oct	Air Canada
13 Oct - 21 Oct	Air Canada
27 Oct - 10 Nov	Air Canada
11 Oct - 27 Oct	Air Canada
30 Oct - 06 Nov	Air Canada
09 Oct - 23 Oct	Air Canada
11 Oct - 26 Oct	Air Canada
08 Oct - 19 Oct	Air Canada
16 Oct - 30 Oct	Air Canada
01 Oct - 05 Oct	Air Canada
10 Oct - 17 Oct	Air Canada
28 Oct - 04 Nov	United
26 Oct - 08 Nov	United
30 Oct - 06 Nov	American Airlines	direct

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

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 October from $524

Return flights