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

Return flights

02 Dec - 09 Dec	Air Canada	direct
04 Dec - 11 Dec	Air Canada	direct
01 Dec - 08 Dec	Air Canada	direct
03 Dec - 10 Dec	Air Canada	direct
02 Dec - 16 Dec	Air Canada	direct
08 Dec - 15 Dec	Air Canada	direct
10 Dec - 17 Dec	Air Canada	direct
09 Dec - 16 Dec	Air Canada	direct
05 Dec - 09 Dec	Arajet
05 Dec - 12 Dec	Air Canada	direct
29 Dec - 12 Jan	WestJet
29 Dec - 08 Jan	WestJet
14 Dec - 10 Jan	WestJet
31 Dec - 07 Jan	WestJet
22 Dec - 01 Jan	WestJet
14 Dec - 10 Jan	Air Transat	direct
01 Dec - 22 Jan	United
30 Dec - 06 Jan	WestJet
31 Dec - 04 Jan	WestJet
27 Dec - 07 Jan	WestJet

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 319€

Return flights