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

Return flights

12 Oct - 19 Oct	Frontier Airlines
04 Oct - 25 Oct	jetBlue
01 Oct - 19 Oct	British Airways
09 Oct - 21 Oct	Qatar Airways
06 Oct - 10 Oct	Qatar Airways
22 Oct - 05 Nov	Qatar Airways
15 Oct - 06 Nov	Qatar Airways
27 Oct - 10 Nov	Qatar Airways
16 Oct - 05 Nov	Qatar Airways
21 Oct - 04 Nov	Qatar Airways
01 Oct - 10 Oct	Qatar Airways
01 Oct - 21 Oct	Qatar Airways
08 Oct - 15 Oct	Qatar Airways
03 Oct - 14 Oct	Etihad Airways
03 Oct - 25 Oct	Alaska Airlines
18 Oct - 08 Nov	jetBlue
16 Oct - 08 Nov	Qatar Airways
15 Oct - 08 Nov	Qatar Airways
28 Oct - 22 Nov	Qatar Airways
29 Oct - 22 Nov	Qatar Airways

Also check the deals for one-way flights from Ontario to Istanbul in October.

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 October from $932

Return flights