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

Return flights

31 Dec - 30 Jan	Lufthansa
05 Dec - 09 Dec	Lufthansa
03 Dec - 16 Dec	British Airways
03 Dec - 10 Dec	Lufthansa
10 Dec - 15 Dec	Lufthansa
05 Dec - 10 Dec	Lufthansa
02 Dec - 09 Dec	United
01 Dec - 08 Dec	Air France
11 Dec - 14 Dec	Lufthansa
03 Dec - 07 Dec	Brussels Airlines
11 Dec - 18 Dec	United
31 Dec - 30 Jan	TAP	direct
24 Dec - 13 Jan	British Airways
27 Dec - 07 Jan	Finnair
30 Dec - 05 Jan	Lufthansa
27 Dec - 05 Jan	Lufthansa
24 Dec - 01 Jan	Frontier Airlines
13 Dec - 02 Jan	Alaska Airlines
25 Dec - 04 Jan	FrenchBee
27 Dec - 04 Jan	FrenchBee

Also check the deals for one-way flights from San Francisco to Lisbon in December.

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 December from 385€

Return flights