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

Return flights

20 Sep - 25 Sep	IndiGo
19 Sep - 24 Sep	IndiGo
23 Sep - 28 Sep	IndiGo
21 Sep - 28 Sep	AJet
23 Sep - 29 Sep	IndiGo
01 Sep - 28 Sep	IndiGo
19 Sep - 22 Sep	IndiGo
18 Sep - 22 Sep	IndiGo
05 Sep - 16 Sep	IndiGo
07 Sep - 28 Sep	IndiGo
29 Sep - 03 Oct	IndiGo
26 Sep - 03 Oct	IndiGo
24 Sep - 01 Oct	IndiGo
29 Sep - 03 Oct	Turkish Airlines	direct
24 Sep - 01 Oct	Turkish Airlines	direct
26 Sep - 03 Oct	Singapore Airlines	direct

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 $483

Return flights