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

Return flights

01 Dec - 11 Dec	Porter Airlines (Canada) Ltd
03 Dec - 10 Dec	LATAM Airlines Group
02 Dec - 09 Dec	Delta
09 Dec - 16 Dec	Delta
01 Dec - 08 Dec	LATAM Airlines Group
04 Dec - 11 Dec	LATAM Airlines Group
05 Dec - 12 Dec	LATAM Airlines Group
07 Dec - 14 Dec	LATAM Airlines Group
31 Dec - 30 Jan	Arajet
10 Dec - 17 Dec	Arajet
08 Dec - 15 Dec	Arajet
12 Dec - 13 Jan	Delta
29 Dec - 23 Jan	Delta
31 Dec - 30 Jan	Air Canada	direct
10 Dec - 14 Jan	Arajet
31 Dec - 07 Jan	Arajet
16 Dec - 01 Jan	LATAM Airlines Group
13 Dec - 10 Jan	Air Transat
26 Dec - 26 Jan	United
29 Dec - 28 Jan	LATAM Airlines Group

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 $599

Return flights