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

Return flights

01 Dec - 08 Dec	Air Canada
02 Dec - 09 Dec	United
06 Dec - 13 Dec	TAP	direct
01 Dec - 08 Dec	TAP	direct
13 Dec - 30 Dec	Air Canada
13 Dec - 29 Dec	Air Canada
13 Dec - 27 Dec	Air Canada
12 Dec - 29 Dec	Air Canada
13 Dec - 28 Dec	Air Canada
17 Dec - 25 Dec	Lufthansa
24 Dec - 03 Jan	British Airways
17 Dec - 01 Jan	British Airways
23 Dec - 06 Jan	British Airways
27 Dec - 04 Jan	Air Canada
18 Dec - 01 Jan	British Airways
25 Dec - 02 Jan	Lufthansa
24 Dec - 04 Jan	TAP
27 Dec - 03 Jan	Scandinavian Airlines
21 Dec - 04 Jan	Lufthansa
26 Dec - 03 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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest return flights from San Francisco to Lisbon in December from $527

Return flights