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

Return flights

04 Dec - 14 Dec	Lufthansa
03 Dec - 14 Dec	SWISS
01 Dec - 08 Dec	Lufthansa
08 Dec - 31 Dec	Lufthansa
01 Dec - 15 Dec	Lufthansa
08 Dec - 15 Dec	Lufthansa
01 Dec - 24 Dec	Lufthansa
04 Dec - 30 Dec	Lufthansa
02 Dec - 30 Dec	Lufthansa
05 Dec - 30 Dec	Lufthansa
09 Dec - 15 Jan	SWISS
09 Dec - 13 Jan	SWISS
10 Dec - 15 Jan	SWISS
04 Dec - 01 Jan	Lufthansa
10 Dec - 08 Jan	SWISS
11 Dec - 11 Jan	Lufthansa
10 Dec - 11 Jan	SWISS
04 Dec - 06 Jan	Lufthansa
30 Dec - 13 Jan	Lufthansa
30 Dec - 20 Jan	Lufthansa

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 546€

Return flights