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

Return flights

17 Oct - 04 Nov	WestJet
17 Oct - 21 Oct	WestJet
07 Oct - 19 Oct	WestJet
10 Oct - 21 Oct	WestJet
10 Oct - 20 Oct	WestJet
06 Oct - 21 Oct	WestJet
07 Oct - 15 Oct	United
27 Oct - 05 Nov	United
27 Oct - 01 Nov	United
14 Oct - 22 Oct	United
14 Oct - 28 Oct	WestJet
21 Oct - 27 Oct	WestJet
09 Oct - 20 Oct	Air Transat
27 Oct - 03 Nov	WestJet
27 Oct - 04 Nov	WestJet
25 Oct - 04 Nov	WestJet
26 Oct - 06 Nov	United
26 Oct - 03 Nov	WestJet
27 Oct - 09 Nov	WestJet
29 Oct - 05 Nov	Air Canada	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 252€

Return flights