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

Return flights

25 Aug - 08 Sep	United
26 Aug - 09 Sep	United
13 Aug - 27 Aug	United
18 Aug - 01 Sep	United
19 Aug - 02 Sep	United
21 Aug - 04 Sep	United
11 Aug - 25 Aug	United
14 Aug - 28 Aug	United
04 Aug - 18 Aug	United
05 Aug - 19 Aug	United
07 Aug - 21 Aug	United
15 Aug - 29 Aug	United
12 Aug - 26 Aug	United
06 Aug - 20 Aug	United
17 Aug - 31 Aug	United
23 Aug - 06 Sep	United
22 Aug - 05 Sep	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 995€

Return flights