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

Return flights

07 Oct - 21 Oct	United
09 Oct - 23 Oct	United
06 Oct - 20 Oct	United
13 Oct - 27 Oct	United
15 Oct - 29 Oct	United
16 Oct - 30 Oct	United
27 Oct - 10 Nov	United
28 Oct - 11 Nov	United
30 Oct - 13 Nov	United
01 Oct - 15 Oct	United
08 Oct - 22 Oct	United
02 Oct - 16 Oct	United
14 Oct - 28 Oct	United
21 Oct - 04 Nov	United
23 Oct - 06 Nov	United
26 Oct - 09 Nov	United
31 Oct - 14 Nov	United
24 Oct - 07 Nov	United
25 Oct - 08 Nov	United
19 Oct - 02 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 930€

Return flights