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

Return flights

27 Sep - 13 Oct	Pegasus Airlines
01 Sep - 10 Sep	IndiGo
02 Sep - 12 Sep	IndiGo
01 Sep - 08 Sep	IndiGo
20 Sep - 27 Sep	Pegasus Airlines
11 Sep - 23 Sep	Pegasus Airlines
30 Sep - 07 Oct	Pegasus Airlines
21 Sep - 26 Sep	Pegasus Airlines
24 Sep - 01 Oct	Pegasus Airlines
09 Sep - 16 Sep	Etihad Airways
10 Sep - 18 Sep	Pegasus Airlines
02 Sep - 09 Sep	IndiGo
01 Sep - 11 Sep	IndiGo
28 Sep - 06 Oct	Etihad Airways
21 Sep - 04 Oct	Pegasus Airlines
20 Sep - 05 Oct	Pegasus Airlines
28 Sep - 10 Oct	Pegasus Airlines
24 Sep - 10 Oct	Pegasus Airlines
01 Sep - 31 Oct	Pegasus Airlines
22 Sep - 06 Oct	Turkish Airlines

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 389€

Return flights