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

Return flights

10 Sep - 22 Sep	British Airways
02 Sep - 22 Sep	British Airways
05 Sep - 15 Sep	British Airways
18 Sep - 17 Oct	Qatar Airways
30 Sep - 21 Oct	British Airways
09 Sep - 30 Sep	Qatar Airways
03 Sep - 30 Sep	Qatar Airways
09 Sep - 03 Oct	Qatar Airways
17 Sep - 07 Oct	Qatar Airways
03 Sep - 17 Sep	Qatar Airways
04 Sep - 16 Sep	Qatar Airways
16 Sep - 24 Sep	Qatar Airways
15 Sep - 30 Sep	Qatar Airways
15 Sep - 29 Sep	Qatar Airways
09 Sep - 01 Oct	Qatar Airways
10 Sep - 01 Oct	Etihad Airways
15 Sep - 10 Oct	Qatar Airways
24 Sep - 11 Oct	Qatar Airways
26 Sep - 09 Oct	British Airways
16 Sep - 04 Oct	Qatar Airways

Also check the deals for one-way flights from Ontario 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 Ontario to Istanbul in September from $947

Return flights