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

Return flights

23 Sep - 30 Sep	Copa
22 Sep - 29 Sep	Copa
17 Sep - 24 Sep	Copa
17 Sep - 25 Sep	Copa
23 Sep - 02 Oct	Copa
26 Sep - 05 Oct	Copa
26 Sep - 08 Oct	Copa
26 Sep - 03 Oct	Copa
19 Sep - 29 Sep	Delta
18 Sep - 22 Sep	Delta
20 Sep - 27 Sep	Delta
19 Sep - 26 Sep	Delta
21 Sep - 28 Sep	Delta
19 Sep - 25 Sep	Delta
30 Sep - 15 Oct	Delta
30 Sep - 31 Oct	Delta
24 Sep - 01 Oct	Delta
25 Sep - 07 Oct	Delta
21 Sep - 06 Oct	Delta
28 Sep - 05 Oct	LATAM Airlines Group

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 498€

Return flights