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

Return flights

30 Dec - 25 Jan	Air Transat	direct
31 Dec - 19 Jan	Icelandair
31 Dec - 29 Jan	Lufthansa
30 Dec - 18 Jan	Scandinavian Airlines
31 Dec - 13 Jan	WestJet
30 Dec - 20 Jan	Air Transat
28 Dec - 28 Jan	TAP
30 Dec - 18 Jan	Air Transat	direct
30 Dec - 12 Jan	Air Transat
27 Dec - 12 Jan	Icelandair
25 Dec - 28 Dec	KLM
27 Dec - 29 Dec	WestJet
27 Dec - 31 Dec	WestJet
22 Dec - 26 Dec	Lufthansa
28 Dec - 31 Dec	WestJet
24 Dec - 27 Dec	Air Transat
24 Dec - 28 Dec	Lufthansa
23 Dec - 28 Dec	LOT
23 Dec - 30 Dec	LOT
24 Dec - 30 Dec	Air France

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

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 December from $838

Return flights