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

Return flights

18 Aug - 18 Sep	WestJet
20 Aug - 23 Sep	TAP
24 Aug - 07 Sep	WestJet
26 Aug - 20 Sep	Flair Airlines
25 Aug - 08 Sep	TAP
24 Aug - 30 Sep	WestJet
20 Aug - 16 Sep	WestJet
19 Aug - 12 Sep	WestJet
18 Aug - 21 Sep	WestJet
24 Aug - 13 Sep	WestJet
20 Aug - 31 Aug	WestJet
22 Aug - 31 Aug	TAP
23 Aug - 31 Aug	WestJet
18 Aug - 31 Aug	WestJet
18 Aug - 26 Aug	WestJet
21 Aug - 31 Aug	WestJet
24 Aug - 30 Aug	WestJet
24 Aug - 31 Aug	WestJet
20 Aug - 25 Aug	WestJet
20 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 570€

Return flights