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

Return flights

03 Sep - 03 Oct	Sichuan Airlines
01 Sep - 08 Sep	China Eastern
23 Sep - 30 Sep	Scoot Tigerair
04 Sep - 14 Oct	Hainan Airlines
03 Sep - 14 Oct	Sichuan Airlines
01 Sep - 10 Sep	China Southern
08 Sep - 22 Sep	IndiGo
09 Sep - 26 Sep	IndiGo
06 Sep - 07 Sep	Scoot Tigerair
20 Sep - 26 Sep	IndiGo
01 Sep - 14 Oct	Scoot Tigerair
14 Sep - 21 Sep	IndiGo
04 Sep - 11 Sep	IndiGo
10 Sep - 22 Oct	China Southern
05 Sep - 18 Sep	IndiGo
23 Sep - 26 Oct	Etihad Airways
19 Sep - 19 Oct	Etihad Airways
24 Sep - 02 Oct	IndiGo
15 Sep - 01 Oct	China Southern
01 Sep - 20 Oct	China Southern

Also check the deals for one-way flights from Sydney to Istanbul 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 Sydney to Istanbul in September from $859

Return flights