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

Return flights

09 Sep - 30 Sep	Copa
17 Sep - 24 Sep	Copa
12 Sep - 03 Oct	Copa
09 Sep - 03 Oct	Copa
16 Sep - 07 Oct	WestJet
24 Sep - 01 Oct	WestJet
15 Sep - 20 Sep	Delta
13 Sep - 16 Sep	Delta
08 Sep - 19 Sep	Delta
17 Sep - 20 Sep	Delta
03 Sep - 12 Sep	Delta
01 Sep - 21 Sep	United
03 Sep - 24 Sep	Delta
18 Sep - 26 Sep	Delta
13 Sep - 03 Oct	Delta
13 Sep - 04 Oct	Delta
14 Sep - 04 Oct	Delta
14 Sep - 05 Oct	Delta
06 Sep - 04 Oct	Delta
21 Sep - 04 Oct	Delta

Also check the deals for one-way flights from Toronto 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 Toronto to Sao Paulo in September from $602

Return flights