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

Return flights

02 Dec - 09 Dec	Pegasus Airlines
03 Dec - 09 Dec	Ryanair
01 Dec - 22 Dec	Pegasus Airlines
07 Dec - 16 Dec	Ryanair
01 Dec - 03 Dec	Pegasus Airlines
07 Dec - 13 Dec	Ryanair
07 Dec - 11 Dec	Ryanair
02 Dec - 11 Dec	AJet
06 Dec - 09 Dec	Pegasus Airlines
01 Dec - 16 Dec	AJet
10 Dec - 19 Jan	Ryanair
08 Dec - 13 Jan	Pegasus Airlines
06 Dec - 17 Jan	Pegasus Airlines
05 Dec - 21 Jan	Ryanair
07 Dec - 17 Jan	Ryanair
01 Dec - 28 Jan	Ryanair
10 Dec - 12 Jan	Ryanair
09 Dec - 01 Jan	Ryanair
07 Dec - 10 Jan	Ryanair
31 Dec - 22 Jan	Pegasus 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 539€

Return flights