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

Return flights

28 Dec - 12 Jan	British Airways
03 Dec - 11 Jan	British Airways
30 Dec - 24 Jan	Alaska Airlines
25 Dec - 17 Jan	Alaska Airlines
08 Dec - 15 Dec	Alaska Airlines
26 Dec - 17 Jan	Alaska Airlines
03 Dec - 17 Dec	Alaska Airlines
09 Dec - 11 Jan	Alaska Airlines
09 Dec - 15 Dec	Alaska Airlines
07 Dec - 27 Dec	Alaska Airlines
01 Dec - 18 Dec	Qatar Airways
24 Dec - 17 Jan	Alaska Airlines
26 Dec - 10 Jan	Alaska Airlines
23 Dec - 17 Jan	Alaska Airlines
02 Dec - 27 Dec	Qatar Airways
25 Dec - 10 Jan	Alaska Airlines
06 Dec - 27 Dec	Alaska Airlines
12 Dec - 18 Dec	Alaska Airlines
08 Dec - 11 Dec	Alaska Airlines
01 Dec - 27 Dec	Qatar Airways

Also check the deals for one-way flights from Ontario 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 Ontario to Istanbul in December from $818

Return flights