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

Return flights

15 Oct - 22 Oct	Brussels Airlines
13 Oct - 20 Oct	Air Canada
07 Oct - 14 Oct	Air Canada
14 Oct - 21 Oct	Air Canada
18 Oct - 25 Oct	Iberia For Level
02 Oct - 09 Oct	Air Canada
21 Oct - 28 Oct	Air Canada
28 Oct - 04 Nov	Air Canada
22 Oct - 29 Oct	Air Canada
29 Oct - 05 Nov	Air Canada
04 Oct - 25 Oct	Iberia For Level
16 Oct - 23 Oct	Air Canada
31 Oct - 07 Nov	Scandinavian Airlines
30 Oct - 06 Nov	Scandinavian Airlines
22 Oct - 04 Nov	Delta
27 Oct - 03 Nov	Lufthansa
27 Oct - 03 Nov	TAP	direct
25 Oct - 01 Nov	TAP	direct
20 Oct - 10 Nov	Air France
30 Oct - 13 Nov	Scandinavian Airlines

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 410€

Return flights