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

Return flights

29 Aug - 05 Sep	LATAM Airlines Group
31 Aug - 07 Sep	Air Canada
28 Aug - 04 Sep	Copa
27 Aug - 03 Sep	Copa
22 Aug - 29 Aug	LATAM Airlines Group
15 Aug - 22 Aug	Arajet
13 Aug - 20 Aug	Air Canada
20 Aug - 27 Aug	Air Canada
15 Aug - 28 Aug	Air Canada
28 Aug - 05 Sep	Delta
26 Aug - 02 Sep	Copa
22 Aug - 25 Aug	LATAM Airlines Group
10 Aug - 17 Aug	LATAM Airlines Group
11 Aug - 18 Aug	LATAM Airlines Group
23 Aug - 30 Aug	LATAM Airlines Group
20 Aug - 01 Sep	Delta
14 Aug - 21 Aug	LATAM Airlines Group
22 Aug - 01 Sep	Air Canada
25 Aug - 01 Sep	Copa

Also check the deals for one-way flights from Montreal to Buenos Aires in August.

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 August from $749

Return flights