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

Return flights

14 Sep - 24 Sep	Avianca
01 Sep - 05 Sep	Avianca
01 Sep - 08 Sep	Avianca
03 Sep - 10 Sep	Avianca
07 Sep - 14 Sep	Avianca
17 Sep - 24 Sep	Avianca
21 Sep - 28 Sep	Avianca
08 Sep - 15 Sep	Avianca
10 Sep - 17 Sep	Avianca
14 Sep - 21 Sep	Avianca
29 Sep - 06 Oct	Avianca
24 Sep - 01 Oct	Avianca
28 Sep - 05 Oct	Avianca
29 Sep - 31 Oct	Avianca
26 Sep - 03 Oct	Avianca
20 Sep - 06 Oct	Copa
23 Sep - 09 Oct	Copa
30 Sep - 07 Oct	Copa
24 Sep - 01 Oct	Air Canada	direct
23 Sep - 09 Oct	Air Canada	direct

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 485€

Return flights