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

Return flights

30 Oct - 10 Nov	WestJet
14 Oct - 24 Oct	United
21 Oct - 29 Oct	United
05 Oct - 23 Oct	United
15 Oct - 04 Nov	Air Canada	direct
20 Oct - 27 Oct	Air Canada	direct
13 Oct - 20 Oct	Air Canada	direct
06 Oct - 13 Oct	Air Canada	direct
01 Oct - 07 Oct	Air Canada	direct
27 Oct - 03 Nov	Air Canada
28 Oct - 04 Nov	Air Canada
22 Oct - 29 Oct	Air Canada
27 Oct - 31 Oct	United
01 Oct - 08 Oct	Air Canada
28 Oct - 11 Nov	WestJet
29 Oct - 05 Nov	Air Canada
25 Oct - 03 Nov	Air Canada
30 Oct - 06 Nov	Air Canada
26 Oct - 02 Nov	Air Canada
28 Oct - 11 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 277€

Return flights