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

Return flights

08 Sep - 12 Sep	WestJet
29 Sep - 06 Oct	United
30 Sep - 07 Oct	United
21 Sep - 30 Sep	United
16 Sep - 30 Sep	United
02 Sep - 09 Sep	United
08 Sep - 15 Sep	United
13 Sep - 20 Sep	United
15 Sep - 24 Sep	United
07 Sep - 12 Sep	United
12 Sep - 15 Sep	United
05 Sep - 12 Sep	United
29 Sep - 06 Oct	Air Canada	direct
30 Sep - 07 Oct	Air Canada	direct
23 Sep - 08 Oct	Air Canada
24 Sep - 01 Oct	Air Canada
27 Sep - 04 Oct	United
26 Sep - 01 Oct	Air Canada	direct
28 Sep - 05 Oct	Air Canada
24 Sep - 01 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.

Book a cheap hotel in Cancun

Cheap car rent in Cancun

Cheapest return flights from Montreal to Cancun in September from 283€

Return flights