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

Return flights

03 Dec - 10 Dec	LATAM Airlines Group
07 Dec - 14 Dec	LATAM Airlines Group
04 Dec - 11 Dec	LATAM Airlines Group
08 Dec - 15 Dec	Arajet
05 Dec - 12 Dec	Arajet
06 Dec - 13 Dec	LATAM Airlines Group
05 Dec - 17 Dec	Copa
02 Dec - 09 Dec	United
01 Dec - 08 Dec	Delta
09 Dec - 16 Dec	Porter Airlines (Canada) Ltd
29 Dec - 19 Jan	Porter Airlines (Canada) Ltd
08 Dec - 11 Jan	Arajet
26 Dec - 26 Jan	Porter Airlines (Canada) Ltd
31 Dec - 11 Jan	Arajet
04 Dec - 10 Jan	LATAM Airlines Group
24 Dec - 11 Jan	WestJet
29 Dec - 11 Jan	WestJet
26 Dec - 26 Jan	Air Canada	direct
08 Dec - 06 Jan	Arajet
26 Dec - 13 Jan	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Montreal to Sao Paulo in December.

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 December from $645

Return flights