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

Return flights

01 Dec - 30 Dec	Air China
04 Dec - 29 Dec	Air China
04 Dec - 28 Dec	Air China
04 Dec - 27 Dec	SWISS
04 Dec - 11 Dec	British Airways
06 Dec - 22 Dec	Lufthansa
01 Dec - 04 Dec	Air China
04 Dec - 08 Dec	SWISS
04 Dec - 10 Dec	British Airways
02 Dec - 30 Dec	SWISS
30 Dec - 22 Jan	Air China
31 Dec - 17 Jan	Lufthansa
31 Dec - 13 Jan	Lufthansa
30 Dec - 13 Jan	Lufthansa
11 Dec - 09 Jan	Aegean Airlines
29 Dec - 05 Jan	British Airways
01 Dec - 01 Jan	Finnair
18 Dec - 15 Jan	British Airways
05 Dec - 07 Jan	Finnair
06 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 $639

Return flights