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

Return flights

10 Dec - 17 Dec	Pegasus Airlines
10 Dec - 15 Dec	Flynas
07 Dec - 13 Dec	AJet
07 Dec - 14 Dec	Flynas
12 Dec - 14 Dec	AirAsia X
10 Dec - 12 Jan	Gulf Air
08 Dec - 12 Dec	AJet
12 Dec - 06 Jan	Flynas
09 Dec - 13 Dec	Flynas
11 Dec - 18 Dec	Air Cairo
10 Dec - 18 Dec	Flynas
15 Dec - 21 Dec	AirAsia X
24 Dec - 02 Jan	Pegasus Airlines
15 Dec - 10 Jan	AirAsia X
15 Dec - 09 Jan	Air Arabia
30 Dec - 02 Jan	Flynas
30 Dec - 11 Jan	Flynas
30 Dec - 07 Jan	Flynas
28 Dec - 12 Jan	AJet
30 Dec - 05 Jan	Flynas

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 $501

Return flights