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

Return flights

27 Sep - 30 Oct	United
30 Sep - 28 Oct	United
22 Sep - 30 Sep	United
27 Sep - 30 Sep	United
09 Sep - 30 Sep	United
09 Sep - 16 Sep	United
10 Sep - 16 Sep	United
16 Sep - 30 Sep	United
23 Sep - 30 Sep	United
09 Sep - 15 Sep	United
10 Sep - 15 Sep	United
23 Sep - 07 Oct	United
16 Sep - 07 Oct	United
30 Sep - 07 Oct	United
05 Sep - 15 Sep	United
24 Sep - 01 Oct	WestJet
23 Sep - 01 Oct	Air Transat	direct
24 Sep - 01 Oct	Air Transat	direct
22 Sep - 01 Oct	Air Transat	direct
30 Sep - 28 Oct	Air Transat	direct

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 $294

Return flights