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

Return flights

03 Sep - 01 Oct	Avianca
03 Sep - 10 Sep	Arajet
25 Sep - 02 Oct	WestJet
24 Sep - 01 Oct	Arajet
17 Sep - 25 Sep	Arajet
17 Sep - 24 Sep	Arajet
10 Sep - 17 Sep	Arajet
14 Sep - 30 Sep	Delta
02 Sep - 13 Sep	Delta
12 Sep - 24 Sep	Delta
26 Sep - 12 Oct	Delta
12 Sep - 19 Sep	Arajet
15 Sep - 22 Sep	Arajet
26 Sep - 03 Oct	Arajet
06 Sep - 13 Sep	LATAM Airlines Group
28 Sep - 05 Oct	LATAM Airlines Group
30 Sep - 07 Oct	LATAM Airlines Group
02 Sep - 02 Oct	LATAM Airlines Group
23 Sep - 09 Oct	LATAM Airlines Group
27 Sep - 04 Oct	WestJet

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 $445

Return flights