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

Return flights

24 Dec - 14 Jan	SWISS
14 Dec - 23 Jan	SWISS
24 Dec - 30 Dec	SWISS
24 Dec - 31 Dec	SWISS
16 Dec - 13 Jan	KLM
16 Dec - 23 Dec	KLM
16 Dec - 22 Dec	KLM
24 Dec - 12 Jan	SWISS
14 Dec - 23 Dec	SWISS
29 Dec - 29 Jan	SWISS
28 Dec - 29 Jan	SWISS
31 Dec - 17 Jan	KLM
12 Dec - 31 Dec	KLM
28 Dec - 30 Jan	SWISS
24 Dec - 01 Jan	SWISS
12 Dec - 21 Dec	KLM
12 Dec - 17 Dec	KLM
14 Dec - 24 Dec	SWISS
16 Dec - 30 Dec	KLM
29 Dec - 14 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 $844

Return flights