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

Return flights

02 Dec - 08 Dec	SWISS
02 Dec - 10 Dec	SWISS
04 Dec - 10 Dec	SWISS
03 Dec - 10 Dec	SWISS
03 Dec - 08 Dec	SWISS
04 Dec - 08 Dec	SWISS
02 Dec - 07 Dec	SWISS
03 Dec - 29 Dec	KLM
04 Dec - 29 Dec	KLM
04 Dec - 28 Dec	KLM
03 Dec - 14 Jan	SWISS
06 Dec - 15 Jan	SWISS
01 Dec - 15 Jan	SWISS
01 Dec - 14 Jan	SWISS
07 Dec - 25 Jan	KLM
10 Dec - 14 Jan	SWISS
01 Dec - 16 Jan	SWISS
11 Dec - 16 Jan	SWISS
04 Dec - 08 Jan	SWISS
03 Dec - 07 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 $654

Return flights