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

Return flights

11 Dec - 19 Jan	Avianca
13 Dec - 25 Dec	Avianca
21 Dec - 04 Jan	Avianca
16 Dec - 30 Dec	Avianca
25 Dec - 13 Jan	Avianca
11 Dec - 27 Dec	Avianca
16 Dec - 02 Jan	Avianca
27 Dec - 06 Jan	Avianca
27 Dec - 01 Jan	Avianca
25 Dec - 02 Jan	Avianca
25 Dec - 07 Jan	Avianca
18 Dec - 07 Jan	Avianca
28 Dec - 02 Jan	Avianca

Also check the deals for one-way flights from Ontario to Sao Paulo 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 Sao Paulo in December from $1504

Return flights