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

Return flights

07 Oct - 17 Oct	United
27 Oct - 31 Oct	United
21 Oct - 29 Oct	United
21 Oct - 28 Oct	United
27 Oct - 30 Oct	United
27 Oct - 05 Nov	United
29 Oct - 03 Nov	WestJet
27 Oct - 03 Nov	WestJet
28 Oct - 03 Nov	WestJet
29 Oct - 30 Oct	WestJet
01 Oct - 28 Oct	Air Transat	direct
29 Oct - 05 Nov	WestJet
29 Oct - 30 Oct	Air Transat	direct
07 Oct - 15 Oct	United
14 Oct - 20 Oct	Air Canada
29 Oct - 10 Nov	WestJet
27 Oct - 10 Nov	WestJet
29 Oct - 05 Nov	Air Transat	direct
27 Oct - 03 Nov	Air Canada	direct
26 Oct - 02 Nov	WestJet

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 $289

Return flights