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

Return flights

05 Sep - 12 Sep	Copa
09 Sep - 16 Sep	Copa
10 Sep - 17 Sep	Copa
11 Sep - 18 Sep	Copa
12 Sep - 19 Sep	Copa
16 Sep - 23 Sep	Copa
18 Sep - 25 Sep	Copa
19 Sep - 26 Sep	Copa
23 Sep - 30 Sep	Copa
07 Sep - 22 Sep	Copa
24 Sep - 01 Oct	Copa
25 Sep - 02 Oct	Copa
29 Sep - 06 Oct	Copa
30 Sep - 07 Oct	Copa
22 Sep - 22 Oct	Copa
23 Sep - 23 Oct	Copa
30 Sep - 14 Oct	Copa
30 Sep - 09 Oct	Copa
26 Sep - 04 Oct	Delta
30 Sep - 15 Oct	Delta

Also check the deals for one-way flights from Montreal 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 Montreal to Sao Paulo in September from $573

Return flights