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

Return flights

29 Sep - 13 Oct	Air Canada
24 Sep - 01 Oct	American Airlines
22 Sep - 01 Oct	Air Canada
23 Sep - 30 Sep	United
24 Sep - 30 Sep	United
21 Sep - 23 Sep	United
17 Sep - 30 Sep	United
17 Sep - 23 Sep	United
18 Sep - 25 Sep	United
24 Sep - 01 Oct	Air Transat	direct
17 Sep - 27 Oct	Air Transat	direct
23 Sep - 27 Oct	Air Transat	direct
22 Sep - 02 Oct	Air Transat	direct
22 Sep - 25 Sep	Air Transat	direct
18 Sep - 23 Sep	Air Transat	direct
17 Sep - 23 Sep	Air Transat	direct
29 Sep - 06 Oct	Air Canada	direct
25 Sep - 04 Oct	Air Transat
29 Sep - 02 Oct	Air Transat	direct
17 Sep - 24 Sep	United

Also check the deals for one-way flights from Montreal to Cancun 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 Cancun in September from 253€

Return flights