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

Return flights

05 Dec - 14 Dec	Volaris
24 Dec - 11 Jan	Volaris
18 Dec - 01 Jan	Volaris
13 Dec - 22 Dec	Avianca
15 Dec - 01 Jan	Volaris
28 Dec - 12 Jan	Avianca
21 Dec - 28 Dec	Avianca
30 Dec - 15 Jan	Avianca
18 Dec - 02 Jan	Volaris
17 Dec - 02 Jan	Volaris
23 Dec - 28 Dec	Avianca
22 Dec - 11 Jan	Volaris
30 Dec - 08 Jan	Avianca
30 Dec - 04 Jan	Avianca
20 Dec - 30 Dec	Avianca
13 Dec - 21 Dec	Avianca

Also check the deals for one-way flights from Ontario to Buenos Aires 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 Buenos Aires in December from $1496

Return flights