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

Return flights

29 Oct - 05 Nov	British Airways
14 Oct - 28 Oct	SWISS
13 Oct - 08 Nov	British Airways
20 Oct - 05 Nov	British Airways
20 Oct - 15 Nov	TAP	direct
22 Oct - 15 Nov	TAP	direct
13 Oct - 08 Nov	TAP	direct
20 Oct - 05 Nov	TAP	direct
21 Oct - 24 Nov	Lufthansa
20 Oct - 30 Oct	SWISS
11 Oct - 20 Oct	SWISS
15 Oct - 29 Oct	British Airways
21 Oct - 31 Oct	SWISS
04 Oct - 15 Oct	British Airways
05 Oct - 25 Oct	British Airways
03 Oct - 08 Oct	British Airways
02 Oct - 07 Oct	British Airways
22 Oct - 25 Oct	Brussels Airlines
31 Oct - 22 Nov	TAP	direct
06 Oct - 01 Nov	Brussels 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 406€

Return flights