AirHint found the following cheapest return flights from Montreal (YUL) to Buenos Aires (EZE) in December 2025 (see full year).

Return flights

10 Dec - 17 Dec	Copa
11 Dec - 18 Dec	Copa
08 Dec - 15 Dec	Copa
09 Dec - 16 Dec	Copa
14 Dec - 21 Dec	LATAM Airlines Group
16 Dec - 23 Dec	LATAM Airlines Group
15 Dec - 22 Dec	LATAM Airlines Group
13 Dec - 20 Dec	LATAM Airlines Group
12 Dec - 19 Dec	LATAM Airlines Group
16 Dec - 28 Dec	United
30 Dec - 16 Jan	Porter Airlines (Canada) Ltd
30 Dec - 15 Jan	LATAM Airlines Group
24 Dec - 19 Jan	Arajet
31 Dec - 15 Jan	Air Transat
31 Dec - 07 Jan	Avianca
26 Dec - 11 Jan	Porter Airlines (Canada) Ltd
20 Dec - 14 Jan	Air Transat
19 Dec - 31 Jan	Porter Airlines (Canada) Ltd
21 Dec - 18 Jan	Porter Airlines (Canada) Ltd
18 Dec - 15 Jan	WestJet

Also check the deals for one-way flights from Montreal to Buenos Aires 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 Buenos Aires in December from 658€

Return flights