AirHint found the following cheapest return flights from Montreal (YUL) to Rio De Janeiro (GIG) in September 2025 (see full year).

Return flights

05 Sep - 18 Sep	Delta
04 Sep - 17 Sep	Copa
02 Sep - 15 Sep	Copa
24 Sep - 02 Oct	Copa
04 Sep - 11 Sep	Copa
07 Sep - 14 Sep	Copa
01 Sep - 14 Sep	Copa
01 Sep - 05 Sep	Copa
02 Sep - 08 Sep	Copa
02 Sep - 09 Sep	Copa
06 Sep - 13 Sep	Copa
28 Sep - 09 Oct	Copa
24 Sep - 01 Oct	Copa
25 Sep - 02 Oct	LATAM Airlines Group
29 Sep - 06 Oct	GOL Linhas Aéreas
26 Sep - 03 Oct	GOL Linhas Aéreas
28 Sep - 05 Oct	Copa
22 Sep - 10 Oct	Copa
30 Sep - 08 Oct	WestJet
30 Sep - 07 Oct	Copa

Also check the deals for one-way flights from Montreal to Rio De Janeiro 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 Rio De Janeiro in September from 423€

Return flights