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

Return flights

01 Dec - 23 Dec	Air India
01 Dec - 08 Dec	Air India
02 Dec - 09 Dec	Air India
02 Dec - 07 Dec	Air India
02 Dec - 10 Dec	Air India
01 Dec - 07 Dec	Air India
02 Dec - 14 Dec	Air India
02 Dec - 22 Dec	Air India
01 Dec - 10 Dec	Air India
01 Dec - 17 Dec	Air India
04 Dec - 26 Jan	Air China
05 Dec - 27 Jan	Air China
04 Dec - 27 Jan	Air China
04 Dec - 14 Jan	Air China
03 Dec - 14 Jan	Air China
01 Dec - 11 Jan	Hainan Airlines
05 Dec - 14 Jan	Air China
08 Dec - 18 Jan	Hainan Airlines
01 Dec - 16 Jan	Air China
01 Dec - 23 Jan	Air China

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 351€

Return flights