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

Return flights

22 Oct - 26 Oct	British Airways
06 Oct - 13 Oct	British Airways
23 Oct - 19 Nov	British Airways
23 Oct - 18 Nov	British Airways
24 Oct - 23 Nov	British Airways
25 Oct - 23 Nov	British Airways
24 Oct - 24 Nov	British Airways
19 Oct - 08 Nov	Air Transat
12 Oct - 28 Nov	Air Transat
05 Oct - 08 Oct	FrenchBee
13 Oct - 08 Nov	FrenchBee
14 Oct - 08 Nov	Air Transat
17 Oct - 08 Nov	Air Transat
05 Oct - 10 Oct	FrenchBee
12 Oct - 15 Oct	FrenchBee
12 Oct - 22 Oct	FrenchBee
23 Oct - 27 Oct	British Airways
16 Oct - 26 Oct	British Airways
19 Oct - 26 Oct	British Airways
05 Oct - 15 Oct	FrenchBee

Also check the deals for one-way flights from Montreal 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 Montreal to Istanbul in October from 527€

Return flights