AirHint found the following cheapest return flights from London (LHR) to Singapore (SIN) in December 2026 (see full year).

Return flights

01 Dec - 13 Dec	Lufthansa
01 Dec - 23 Dec	Lufthansa
02 Dec - 19 Dec	Lufthansa
03 Dec - 08 Dec	SWISS
06 Dec - 13 Dec	Lufthansa
03 Dec - 22 Dec	SWISS
01 Dec - 17 Dec	Lufthansa
07 Dec - 21 Dec	Lufthansa
01 Dec - 10 Dec	Lufthansa
08 Dec - 20 Dec	Lufthansa
08 Dec - 07 Jan	Finnair
09 Dec - 09 Jan	SWISS
23 Dec - 06 Jan	Scandinavian Airlines
28 Dec - 04 Jan	Air China
09 Dec - 08 Jan	SWISS
22 Dec - 03 Jan	Scandinavian Airlines
24 Dec - 09 Jan	Scandinavian Airlines
16 Dec - 06 Jan	LOT
29 Dec - 05 Jan	Saudia
17 Dec - 01 Jan	Scandinavian Airlines

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 569€

Return flights