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

Return flights

02 Dec - 08 Dec	Lufthansa
16 Dec - 23 Dec	Turkish Airlines
13 Dec - 17 Dec	Turkish Airlines
19 Dec - 29 Dec	Scoot
05 Dec - 27 Dec	SWISS
11 Dec - 21 Dec	Turkish Airlines
19 Dec - 01 Jan	Scoot
23 Dec - 03 Jan	KLM
19 Dec - 02 Jan	Iberia
15 Dec - 02 Jan	TAP
13 Dec - 02 Jan	TAP

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 $742

Return flights