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

Return flights

03 Dec - 10 Dec	United
10 Dec - 24 Dec	United
08 Dec - 12 Dec	United
10 Dec - 17 Dec	United
02 Dec - 15 Dec	United
10 Dec - 19 Dec	United
02 Dec - 22 Dec	WestJet
10 Dec - 24 Dec	Air Canada	direct
23 Dec - 30 Dec	WestJet
09 Dec - 16 Dec	WestJet
15 Dec - 13 Jan	WestJet
16 Dec - 13 Jan	WestJet
16 Dec - 14 Jan	WestJet
15 Dec - 15 Jan	WestJet
31 Dec - 09 Jan	WestJet
31 Dec - 07 Jan	WestJet
15 Dec - 06 Jan	WestJet
16 Dec - 13 Jan	Air Transat	direct
16 Dec - 14 Jan	Air Transat	direct
15 Dec - 15 Jan	Air Transat	direct

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 $303

Return flights