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

Return flights

10 Sep - 16 Sep	WestJet
09 Sep - 16 Sep	Porter Airlines (Canada) Ltd
10 Sep - 15 Sep	WestJet
22 Sep - 05 Oct	Air Transat
09 Sep - 15 Sep	Air Transat
15 Sep - 25 Sep	Porter Airlines (Canada) Ltd
28 Sep - 07 Oct	WestJet
06 Sep - 23 Sep	Air Transat
30 Sep - 08 Oct	Porter Airlines (Canada) Ltd
21 Sep - 25 Sep	WestJet
15 Sep - 20 Sep	Air Transat
09 Sep - 17 Sep	Porter Airlines (Canada) Ltd
12 Sep - 17 Sep	Air Transat
21 Sep - 15 Oct	WestJet
29 Sep - 06 Oct	WestJet
22 Sep - 12 Oct	WestJet
21 Sep - 12 Oct	WestJet
30 Sep - 19 Oct	British Airways
27 Sep - 06 Oct	Air Transat
28 Sep - 19 Oct	WestJet

Also check the deals for one-way flights from Toronto 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 Toronto to Istanbul in September from 508€

Return flights