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

Return flights

26 Dec - 18 Jan	Malaysia Airlines
09 Dec - 05 Jan	Turkish Airlines
24 Dec - 13 Jan	Air India
22 Dec - 29 Dec	Air India
19 Dec - 30 Dec	Air India
21 Dec - 04 Jan	Air India
20 Dec - 04 Jan	Air India
24 Dec - 04 Jan	Air India
14 Dec - 01 Jan	Air India
19 Dec - 28 Dec	Air India
27 Dec - 15 Jan	Malaysia Airlines
27 Dec - 18 Jan	Malaysia Airlines
25 Dec - 14 Jan	Air India
21 Dec - 31 Dec	Air India
12 Dec - 31 Dec	Air India
12 Dec - 30 Dec	Air India
01 Dec - 08 Dec	Etihad Airways
08 Dec - 29 Dec	Air India
11 Dec - 29 Dec	Etihad Airways
01 Dec - 29 Dec	Air India

Also check the deals for one-way flights from Singapore to London 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 Singapore to London in December from 551€

Return flights