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

Return flights

21 Sep - 08 Oct	FrenchBee
24 Sep - 08 Oct	FrenchBee
22 Sep - 01 Oct	FrenchBee
28 Sep - 10 Oct	FrenchBee
24 Sep - 10 Oct	FrenchBee
21 Sep - 01 Oct	FrenchBee
29 Sep - 06 Oct	FrenchBee
28 Sep - 03 Oct	FrenchBee
21 Sep - 05 Oct	FrenchBee
24 Sep - 03 Oct	FrenchBee
22 Sep - 29 Sep	FrenchBee
21 Sep - 29 Sep	FrenchBee
21 Sep - 24 Sep	FrenchBee
17 Sep - 24 Sep	FrenchBee
17 Sep - 29 Sep	FrenchBee
17 Sep - 30 Sep	FrenchBee
19 Sep - 24 Sep	FrenchBee
19 Sep - 29 Sep	FrenchBee
17 Sep - 26 Sep	FrenchBee
17 Sep - 21 Sep	FrenchBee

Also check the deals for one-way flights from Montreal 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 Montreal to Istanbul in September from 544€

Return flights