AirHint found the following cheapest return flights from Montreal (YUL) to Havana (HAV) in September 2025 (see full year).

Return flights

04 Sep - 11 Sep	Copa
24 Sep - 01 Oct	Copa
25 Sep - 02 Oct	Copa
10 Sep - 17 Sep	Copa
17 Sep - 24 Sep	Copa
09 Sep - 16 Sep	Copa
01 Sep - 03 Sep	Copa
28 Sep - 05 Oct	Copa
18 Sep - 25 Sep	Copa
01 Sep - 11 Sep	Copa
14 Sep - 21 Sep	Copa
07 Sep - 14 Sep	Copa
14 Sep - 19 Sep	Copa
19 Sep - 03 Oct	Copa
29 Sep - 06 Oct	Copa
30 Sep - 07 Oct	Copa
06 Sep - 06 Oct	Copa
26 Sep - 03 Oct	Copa

Also check the deals for one-way flights from Montreal to Havana 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 Havana in September from $341

Return flights