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

Return flights

27 Aug - 10 Sep	Volaris
24 Aug - 31 Aug	Frontier Airlines
28 Aug - 11 Sep	Avianca
30 Aug - 04 Sep	Avianca
13 Aug - 27 Aug	United
21 Aug - 01 Sep	Avianca
16 Aug - 02 Sep	Avianca
21 Aug - 28 Aug	Avianca
26 Aug - 09 Sep	Avianca
23 Aug - 23 Sep	Avianca
12 Aug - 26 Aug	United
05 Aug - 19 Aug	United
07 Aug - 21 Aug	United
26 Aug - 06 Sep	Avianca
09 Aug - 28 Aug	Avianca
09 Aug - 31 Aug	Avianca
20 Aug - 03 Sep	United
21 Aug - 04 Sep	United
16 Aug - 30 Aug	Avianca
14 Aug - 28 Aug	United

Also check the deals for one-way flights from Ontario to Sao Paulo 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 Ontario to Sao Paulo in August from $884

Return flights