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

Return flights

20 Sep - 03 Oct	Pegasus Airlines
12 Sep - 22 Sep	Pegasus Airlines
19 Sep - 23 Sep	IndiGo
11 Sep - 25 Sep	IndiGo
26 Sep - 29 Sep	Pegasus Airlines
20 Sep - 27 Sep	Pegasus Airlines
12 Sep - 26 Sep	Pegasus Airlines
25 Sep - 30 Sep	Pegasus Airlines
19 Sep - 20 Sep	IndiGo
18 Sep - 23 Sep	IndiGo
28 Sep - 03 Oct	Pegasus Airlines
10 Sep - 20 Sep	Pegasus Airlines
27 Sep - 05 Oct	Pegasus Airlines
28 Sep - 04 Oct	Pegasus Airlines
25 Sep - 02 Oct	IndiGo
23 Sep - 04 Oct	IndiGo
01 Sep - 01 Oct	IndiGo
26 Sep - 03 Oct	IndiGo
26 Sep - 05 Oct	IndiGo
20 Sep - 25 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 391€

Return flights