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

Return flights

27 Dec - 07 Jan	Scandinavian Airlines
02 Dec - 16 Dec	United
03 Dec - 10 Dec	United
10 Dec - 15 Dec	SWISS
03 Dec - 10 Dec	TAP	direct
05 Dec - 19 Dec	Air Canada
08 Dec - 15 Dec	TAP	direct
05 Dec - 19 Dec	TAP	direct
13 Dec - 20 Dec	TAP	direct
26 Dec - 05 Jan	British Airways
25 Dec - 04 Jan	Scandinavian Airlines
24 Dec - 04 Jan	British Airways
27 Dec - 03 Jan	Scandinavian Airlines
22 Dec - 02 Jan	Delta
26 Dec - 05 Jan	TAP	direct
23 Dec - 03 Jan	Scandinavian Airlines
20 Dec - 27 Dec	TAP	direct
22 Dec - 02 Jan	TAP	direct

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 472€

Return flights