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

Return flights

09 Sep - 14 Oct	China Eastern
02 Sep - 07 Sep	China Eastern
03 Sep - 13 Sep	China Eastern
10 Sep - 15 Sep	Sichuan Airlines
22 Sep - 22 Oct	Etihad Airways
08 Sep - 22 Sep	Scoot
15 Sep - 21 Sep	China Eastern
23 Sep - 19 Oct	Sichuan Airlines
17 Sep - 28 Oct	AirAsia X
22 Sep - 23 Oct	Etihad Airways
08 Sep - 18 Sep	Scoot
11 Sep - 18 Sep	China Eastern
06 Sep - 20 Sep	Sichuan Airlines
01 Sep - 16 Sep	VietJet Air
12 Sep - 16 Sep	AirAsia X
29 Sep - 06 Oct	Etihad Airways
21 Sep - 30 Oct	AirAsia X
06 Sep - 03 Oct	VietJet Air
18 Sep - 05 Oct	VietJet Air
22 Sep - 09 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 689€

Return flights