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

Return flights

24 Sep - 08 Oct	Avianca
18 Sep - 28 Sep	Avianca
08 Sep - 17 Sep	Avianca
24 Sep - 01 Oct	Avianca
22 Sep - 01 Oct	Avianca
17 Sep - 24 Sep	Avianca
08 Sep - 12 Sep	Avianca
18 Sep - 22 Sep	Avianca
16 Sep - 21 Sep	Avianca
12 Sep - 18 Sep	Avianca
12 Sep - 23 Sep	Avianca
01 Sep - 14 Sep	Arajet
12 Sep - 14 Sep	Avianca
24 Sep - 05 Oct	Avianca
25 Sep - 02 Oct	Delta
27 Sep - 12 Oct	Delta
03 Sep - 03 Oct	GOL Linhas Aéreas
24 Sep - 01 Oct	Air Canada	direct
24 Sep - 05 Oct	Air Canada	direct
02 Sep - 01 Oct	LATAM Airlines Group

Also check the deals for one-way flights from Sao Paulo to Montreal 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 Sao Paulo to Montreal in September from $595

Return flights