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

Return flights

17 Sep - 27 Sep	Sichuan Airlines
02 Sep - 10 Sep	China Southern
11 Sep - 19 Sep	China Southern
14 Sep - 22 Sep	China Southern
15 Sep - 23 Sep	IndiGo
17 Sep - 24 Sep	IndiGo
09 Sep - 12 Sep	IndiGo
07 Sep - 15 Sep	Singapore Airlines
10 Sep - 18 Sep	IndiGo
18 Sep - 26 Sep	IndiGo
21 Sep - 30 Oct	Etihad Airways
22 Sep - 22 Oct	China Southern
16 Sep - 23 Oct	Asiana Airlines
04 Sep - 24 Oct	Asiana Airlines
24 Sep - 02 Oct	IndiGo
23 Sep - 30 Oct	Etihad Airways
23 Sep - 03 Oct	IndiGo
19 Sep - 23 Oct	Asiana Airlines
28 Sep - 26 Oct	Etihad Airways
22 Sep - 13 Oct	Etihad Airways

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 715€

Return flights