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

Return flights

24 Oct - 31 Oct	Air Canada
08 Oct - 15 Oct	Air Canada
22 Oct - 29 Oct	Air Canada
01 Oct - 08 Oct	Air Canada
19 Oct - 26 Oct	Air Canada
26 Oct - 02 Nov	Air Canada
25 Oct - 01 Nov	Air Canada
31 Oct - 07 Nov	Air Canada
31 Oct - 10 Nov	Air Canada
31 Oct - 09 Nov	Air Canada
24 Oct - 29 Oct	Air Canada
15 Oct - 22 Oct	Air Canada
06 Oct - 13 Oct	Copa
21 Oct - 30 Oct	Delta
07 Oct - 14 Oct	LATAM Airlines Group
28 Oct - 04 Nov	LATAM Airlines Group
31 Oct - 30 Nov	Copa

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

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 October from $785

Return flights