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

Return flights

27 Sep - 10 Oct	Pegasus Airlines
22 Sep - 30 Sep	Pegasus Airlines
16 Sep - 21 Sep	Pegasus Airlines
08 Sep - 15 Sep	Pegasus Airlines
20 Sep - 26 Sep	Pegasus Airlines
02 Sep - 10 Sep	Etihad Airways
16 Sep - 23 Sep	Pegasus Airlines
23 Sep - 30 Sep	Pegasus Airlines
27 Sep - 12 Oct	Pegasus Airlines
02 Sep - 07 Sep	IndiGo
28 Sep - 05 Oct	Pegasus Airlines
08 Sep - 14 Sep	Pegasus Airlines
17 Sep - 21 Sep	Pegasus Airlines
27 Sep - 03 Oct	Pegasus Airlines
27 Sep - 04 Oct	Pegasus Airlines
27 Sep - 05 Oct	Pegasus Airlines
22 Sep - 03 Oct	IndiGo
02 Sep - 02 Oct	IndiGo
27 Sep - 01 Oct	IndiGo
19 Sep - 04 Oct	IndiGo

Also check the deals for one-way flights from Istanbul to Singapore in September.

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 September from $470

Return flights