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

Return flights

01 Dec - 29 Dec	KLM
01 Dec - 23 Dec	KLM
01 Dec - 31 Jan	SWISS
01 Dec - 30 Dec	KLM
01 Dec - 27 Dec	KLM
01 Dec - 28 Dec	KLM
01 Dec - 31 Dec	KLM
02 Dec - 31 Dec	Air France
01 Dec - 01 Jan	KLM
01 Dec - 19 Dec	Ryanair
28 Dec - 14 Jan	KLM
31 Dec - 17 Jan	Air France
30 Dec - 17 Jan	Air France
29 Dec - 16 Jan	Finnair
05 Dec - 12 Dec	SWISS
20 Dec - 06 Jan	TAP
25 Dec - 01 Jan	Air France
20 Dec - 05 Jan	Etihad Airways
20 Dec - 07 Jan	Turkish Airlines

Also check the deals for one-way flights from Lisbon to Singapore 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 Lisbon to Singapore in December from 608€

Return flights