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

Return flights

09 Sep - 10 Oct	Turkish Airlines
19 Sep - 11 Oct	jetBlue
19 Sep - 03 Oct	jetBlue
16 Sep - 30 Sep	Qatar Airways
19 Sep - 27 Sep	jetBlue
03 Sep - 10 Sep	Qatar Airways
15 Sep - 15 Oct	Qatar Airways
17 Sep - 23 Sep	Qatar Airways
25 Sep - 14 Oct	Qatar Airways
28 Sep - 03 Oct	Qatar Airways
09 Sep - 16 Sep	Qatar Airways
13 Sep - 26 Sep	jetBlue
17 Sep - 11 Oct	jetBlue
07 Sep - 23 Sep	Etihad Airways
30 Sep - 14 Oct	Etihad Airways
14 Sep - 22 Sep	Qatar Airways
16 Sep - 28 Sep	Qatar Airways
15 Sep - 30 Sep	Etihad Airways
11 Sep - 04 Oct	Qatar Airways
28 Sep - 12 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 $1021

Return flights