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

Return flights

09 Dec - 14 Jan	SWISS
07 Dec - 14 Jan	Lufthansa
02 Dec - 09 Dec	SWISS
04 Dec - 11 Dec	SWISS
07 Dec - 08 Jan	Lufthansa
03 Dec - 15 Dec	SWISS
31 Dec - 16 Jan	SWISS
03 Dec - 14 Dec	KLM
11 Dec - 24 Dec	SWISS
01 Dec - 07 Dec	KLM
07 Dec - 29 Dec	SWISS
07 Dec - 07 Jan	SWISS
30 Dec - 12 Jan	SWISS
01 Dec - 16 Dec	KLM
10 Dec - 08 Jan	Lufthansa
16 Dec - 24 Dec	SWISS
07 Dec - 09 Jan	SWISS
06 Dec - 29 Dec	KLM
12 Dec - 15 Jan	Lufthansa
12 Dec - 16 Jan	SWISS

Also check the deals for one-way flights from London 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 London to Singapore in December from $859

Return flights