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

Return flights

14 Oct - 21 Oct	Air Canada
13 Oct - 20 Oct	Air Canada
20 Oct - 05 Nov	British Airways
21 Oct - 24 Nov	British Airways
22 Oct - 29 Oct	Air Canada
27 Oct - 31 Oct	Scandinavian Airlines
14 Oct - 28 Oct	British Airways
13 Oct - 08 Nov	British Airways
08 Oct - 23 Oct	British Airways
21 Oct - 28 Oct	British Airways
13 Oct - 08 Nov	TAP	direct
31 Oct - 12 Nov	British Airways
31 Oct - 11 Nov	British Airways
22 Oct - 15 Nov	TAP	direct
13 Oct - 01 Nov	TAP	direct
31 Oct - 08 Nov	TAP	direct
31 Oct - 12 Nov	TAP	direct
08 Oct - 16 Oct	British Airways
15 Oct - 21 Oct	British Airways
15 Oct - 29 Oct	British Airways

Also check the deals for one-way flights from San Francisco 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 Francisco to Lisbon in October from $466

Return flights