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

Return flights

09 Sep - 23 Sep	United
10 Sep - 24 Sep	United
11 Sep - 25 Sep	United
15 Sep - 29 Sep	United
16 Sep - 30 Sep	United
29 Sep - 13 Oct	United
30 Sep - 14 Oct	United
17 Sep - 01 Oct	United
18 Sep - 02 Oct	United
23 Sep - 07 Oct	United
08 Sep - 22 Sep	United
22 Sep - 06 Oct	United
02 Sep - 16 Sep	United
03 Sep - 17 Sep	United
04 Sep - 18 Sep	United
14 Sep - 28 Sep	United
28 Sep - 12 Oct	United
26 Sep - 10 Oct	United
24 Sep - 08 Oct	United
27 Sep - 11 Oct	United

Also check the deals for one-way flights from Ontario to Sao Paulo in September.

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 September from 930€

Return flights