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

Return flights

29 Oct - 06 Nov	British Airways
28 Oct - 23 Nov	British Airways
16 Oct - 12 Nov	British Airways
31 Oct - 15 Nov	British Airways
11 Oct - 21 Oct	British Airways
08 Oct - 17 Oct	Qatar Airways
07 Oct - 24 Oct	Qatar Airways
21 Oct - 03 Nov	Qatar Airways
01 Oct - 22 Oct	Qatar Airways
06 Oct - 16 Oct	Qatar Airways
05 Oct - 13 Oct	Qatar Airways
15 Oct - 29 Oct	Qatar Airways
20 Oct - 04 Nov	Qatar Airways
12 Oct - 22 Oct	Qatar Airways
17 Oct - 29 Oct	Qatar Airways
12 Oct - 26 Oct	Qatar Airways
25 Oct - 09 Nov	Alaska Airlines

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 $776

Return flights