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

Return flights

07 Oct - 18 Oct	Air Canada
07 Oct - 17 Oct	Air Canada
29 Oct - 05 Nov	United
02 Oct - 07 Oct	British Airways
19 Oct - 26 Oct	British Airways
14 Oct - 21 Oct	United
01 Oct - 16 Oct	Delta
24 Oct - 31 Oct	United
09 Oct - 16 Oct	United
04 Oct - 11 Oct	United
01 Oct - 10 Oct	Air France

Also check the deals for one-way flights from San Diego to Lisbon 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 Lisbon in October from 492€

Return flights