AirHint found the following cheapest return flights from Montreal (YUL) to Buenos Aires (EZE) in September 2026 (see full year).

Return flights

28 Sep - 11 Oct	Arajet
09 Sep - 16 Sep	Copa
10 Sep - 17 Sep	Copa
15 Sep - 22 Sep	Copa
17 Sep - 24 Sep	Copa
21 Sep - 28 Sep	Copa
22 Sep - 29 Sep	Copa
23 Sep - 30 Sep	Copa
24 Sep - 01 Oct	Copa
28 Sep - 05 Oct	Copa
29 Sep - 06 Oct	Copa
08 Sep - 15 Sep	LATAM Airlines Group
13 Sep - 20 Sep	Avianca
04 Sep - 11 Sep	Copa
25 Sep - 02 Oct	Copa
26 Sep - 03 Oct	Copa

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

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 September from $742

Return flights