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

Return flights

10 Dec - 15 Dec	Pegasus Airlines
12 Dec - 22 Dec	AirAsia X
17 Dec - 05 Jan	AirAsia X
12 Dec - 20 Dec	AirAsia X
10 Dec - 05 Jan	Pegasus Airlines
24 Dec - 01 Jan	Pegasus Airlines
22 Dec - 02 Jan	Pegasus Airlines
20 Dec - 02 Jan	AJet
09 Dec - 24 Dec	AJet
27 Dec - 06 Jan	AJet
31 Dec - 03 Jan	Flynas
11 Dec - 18 Dec	Pegasus Airlines
13 Dec - 20 Dec	Pegasus Airlines
24 Dec - 05 Jan	Pegasus Airlines
17 Dec - 04 Jan	AirAsia X
13 Dec - 18 Dec	Pegasus Airlines
30 Dec - 02 Jan	Flynas
11 Dec - 20 Dec	Pegasus Airlines
16 Dec - 24 Dec	Flynas
15 Dec - 22 Dec	AirAsia X

Also check the deals for one-way flights from Istanbul 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 Istanbul to Singapore in December from 393€

Return flights