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

Return flights

31 Aug - 18 Sep	Porter Airlines (Canada) Ltd
26 Aug - 24 Sep	Air Transat
18 Aug - 18 Sep	WestJet
20 Aug - 10 Sep	Air Canada
21 Aug - 28 Aug	Flair Airlines
03 Aug - 17 Sep	WestJet
26 Aug - 09 Sep	Air Transat
30 Aug - 06 Sep	Air Canada
03 Aug - 10 Sep	Flair Airlines
21 Aug - 01 Sep	Lufthansa
24 Aug - 30 Aug	WestJet
20 Aug - 21 Sep	WestJet
11 Aug - 31 Aug	Flair Airlines
18 Aug - 26 Aug	WestJet
20 Aug - 27 Aug	WestJet
22 Aug - 29 Aug	WestJet
18 Aug - 25 Aug	WestJet
21 Aug - 31 Aug	WestJet
23 Aug - 26 Aug	WestJet
12 Aug - 26 Aug	WestJet

Also check the deals for one-way flights from Toronto to Istanbul in August.

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 August from 610€

Return flights