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

Return flights

25 Oct - 01 Nov	United
08 Oct - 14 Oct	Arajet
15 Oct - 19 Oct	Arajet
07 Oct - 14 Oct	WestJet
08 Oct - 15 Oct	WestJet
01 Oct - 15 Oct	WestJet
14 Oct - 21 Oct	WestJet
13 Oct - 20 Oct	WestJet
31 Oct - 09 Nov	Arajet
10 Oct - 14 Oct	Arajet
21 Oct - 28 Oct	United
28 Oct - 04 Nov	Air Canada
06 Oct - 13 Oct	WestJet
29 Oct - 05 Nov	United
26 Oct - 02 Nov	Aeromexico
31 Oct - 07 Nov	Arajet
28 Oct - 04 Nov	Air Transat	direct
30 Oct - 06 Nov	Air Transat
27 Oct - 03 Nov	Air Transat	direct
29 Oct - 05 Nov	Air Transat	direct

Also check the deals for one-way flights from Montreal to Cancun in October.

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 October from $357

Return flights