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

Return flights

02 Dec - 09 Dec	Lufthansa
08 Dec - 17 Dec	Lufthansa
05 Dec - 12 Dec	United
05 Dec - 10 Dec	United
05 Dec - 09 Dec	Air France
11 Dec - 21 Dec	Air France
05 Dec - 10 Dec	TAP	direct
12 Dec - 26 Dec	Delta
13 Dec - 07 Jan	British Airways
10 Dec - 17 Dec	TAP	direct
08 Dec - 17 Dec	TAP	direct
24 Dec - 17 Jan	United
30 Dec - 09 Jan	Delta
13 Dec - 05 Jan	Scandinavian Airlines
16 Dec - 10 Jan	British Airways
30 Dec - 06 Jan	KLM
24 Dec - 10 Jan	Lufthansa
13 Dec - 06 Jan	Virgin Atlantic
23 Dec - 17 Jan	British Airways
22 Dec - 08 Jan	Scandinavian Airlines

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 384€

Return flights