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

Return flights

09 Sep - 30 Sep	United
16 Sep - 30 Sep	United
21 Sep - 30 Sep	United
10 Sep - 15 Sep	United
14 Sep - 20 Sep	United
02 Sep - 09 Sep	United
08 Sep - 15 Sep	United
22 Sep - 29 Sep	United
23 Sep - 30 Sep	United
09 Sep - 15 Sep	United
30 Sep - 07 Oct	United
27 Sep - 04 Oct	United
16 Sep - 14 Oct	WestJet
10 Sep - 01 Oct	WestJet
17 Sep - 13 Oct	WestJet
28 Sep - 19 Oct	Aeromexico
18 Sep - 18 Oct	Aeromexico
26 Sep - 03 Oct	Aeromexico
28 Sep - 05 Oct	Aeromexico
25 Sep - 02 Oct	Aeromexico

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.

Book a cheap hotel in Cancun

Cheap car rent in Cancun

Cheapest return flights from Montreal to Cancun in September from $340

Return flights