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

Return flights

03 Dec - 22 Dec	United
02 Dec - 11 Dec	United
03 Dec - 11 Dec	United
02 Dec - 22 Dec	United
03 Dec - 16 Dec	WestJet
10 Dec - 23 Dec	WestJet
09 Dec - 23 Dec	WestJet
03 Dec - 17 Dec	WestJet
08 Dec - 16 Dec	WestJet
10 Dec - 16 Dec	WestJet
30 Dec - 20 Jan	WestJet
16 Dec - 13 Jan	WestJet
16 Dec - 14 Jan	WestJet
16 Dec - 15 Jan	WestJet
31 Dec - 21 Jan	Air Canada	direct
31 Dec - 22 Jan	Air Canada	direct
31 Dec - 20 Jan	Porter Airlines (Canada) Ltd
10 Dec - 07 Jan	Porter Airlines (Canada) Ltd
31 Dec - 30 Jan	Porter Airlines (Canada) Ltd
31 Dec - 08 Jan	Air Canada

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

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 December from $288

Return flights