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

Return flights

25 Dec - 09 Jan	Etihad Airways
22 Dec - 28 Dec	KLM
16 Dec - 04 Jan	Turkish Airlines
22 Dec - 04 Jan	Etihad Airways
08 Dec - 23 Dec	Etihad Airways
08 Dec - 17 Dec	Qatar Airways
10 Dec - 22 Dec	Qatar Airways
20 Dec - 04 Jan	Qatar Airways
19 Dec - 03 Jan	Qatar Airways
20 Dec - 03 Jan	Qatar Airways
13 Dec - 27 Dec	IndiGo
12 Dec - 20 Dec	Qatar Airways
20 Dec - 20 Dec	Qatar Airways
18 Dec - 18 Dec	SWISS
19 Dec - 02 Jan	SWISS
12 Dec - 22 Dec	SWISS
12 Dec - 21 Dec	TAP
25 Dec - 01 Jan	Emirates

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 $672

Return flights