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

Return flights

25 Oct - 28 Oct	Avianca
16 Oct - 23 Oct	Avianca
30 Oct - 06 Nov	Avianca
04 Oct - 14 Oct	Avianca
13 Oct - 27 Oct	United
14 Oct - 28 Oct	United
15 Oct - 29 Oct	United
16 Oct - 30 Oct	United
08 Oct - 22 Oct	United
02 Oct - 16 Oct	United
07 Oct - 21 Oct	United
23 Oct - 06 Nov	United
27 Oct - 10 Nov	United
30 Oct - 13 Nov	United
21 Oct - 04 Nov	United
22 Oct - 05 Nov	United
29 Oct - 12 Nov	United
31 Oct - 14 Nov	United
26 Oct - 09 Nov	United
18 Oct - 01 Nov	United

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

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 October from $979

Return flights