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

Return flights

28 Dec - 18 Jan	Shenzhen Airlines
30 Dec - 29 Jan	Air India
30 Dec - 26 Jan	Air India
31 Dec - 26 Jan	Air India
31 Dec - 28 Jan	Air India
30 Dec - 19 Jan	Air India
29 Dec - 14 Jan	Ryanair
29 Dec - 20 Jan	Wizz Air UK
31 Dec - 24 Jan	Gulf Air
26 Dec - 18 Jan	Norwegian Air Sweden AOC
28 Dec - 31 Dec	Shenzhen Airlines
25 Dec - 29 Dec	Gulf Air
25 Dec - 30 Dec	Gulf Air
24 Dec - 28 Dec	Vueling Airlines
22 Dec - 26 Dec	easyJet
24 Dec - 30 Dec	Turkmenistan Airlines
23 Dec - 25 Dec	Scandinavian Airlines
26 Dec - 31 Dec	Ryanair
24 Dec - 27 Dec	Hainan Airlines
24 Dec - 31 Dec	Turkmenistan 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 634€

Return flights