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

Return flights

14 Sep - 23 Oct	AirAsia X
12 Sep - 23 Oct	VietJet Air
15 Sep - 25 Oct	China Eastern
10 Sep - 16 Sep	AirAsia X
05 Sep - 16 Sep	AirAsia X
09 Sep - 23 Sep	Scoot
09 Sep - 22 Oct	VietJet Air
17 Sep - 22 Oct	AirAsia X
02 Sep - 09 Sep	AirAsia X
10 Sep - 17 Sep	AirAsia X
08 Sep - 22 Sep	Scoot
18 Sep - 16 Oct	AirAsia X
18 Sep - 21 Oct	China Eastern
14 Sep - 20 Sep	Sichuan Airlines
18 Sep - 15 Oct	China Eastern
21 Sep - 30 Oct	AirAsia X
03 Sep - 10 Sep	VietJet Air
19 Sep - 21 Sep	VietJet Air
08 Sep - 14 Oct	Scoot
18 Sep - 27 Sep	AirAsia X

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 $797

Return flights