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

Return flights

03 Dec - 10 Dec	British Airways
17 Dec - 04 Jan	Etihad Airways
01 Dec - 31 Dec	British Airways
08 Dec - 22 Dec	Turkish Airlines
21 Dec - 30 Dec	Air France
24 Dec - 05 Jan	British Airways
13 Dec - 04 Jan	Turkish Airlines
06 Dec - 04 Jan	Turkish Airlines
07 Dec - 14 Dec	KLM
14 Dec - 04 Jan	Turkish Airlines
14 Dec - 05 Jan	Qatar Airways
22 Dec - 03 Jan	Turkish Airlines
21 Dec - 03 Jan	Turkish Airlines
15 Dec - 20 Dec	Turkish Airlines
20 Dec - 09 Jan	KLM
19 Dec - 26 Dec	Turkish Airlines
10 Dec - 21 Dec	British Airways
18 Dec - 27 Dec	Qatar Airways

Also check the deals for one-way flights from Singapore 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 Singapore to Lisbon in December from 542€

Return flights