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

Return flights

11 Dec - 18 Dec	Air Transat	direct
10 Dec - 17 Dec	Air Transat	direct
05 Dec - 12 Dec	Air Canada	direct
31 Dec - 07 Jan	Air Transat
03 Dec - 10 Dec	Air Transat	direct
04 Dec - 11 Dec	Air Transat	direct
14 Dec - 21 Dec	Air Transat
07 Dec - 14 Dec	Air Transat
06 Dec - 13 Dec	Air Transat
18 Dec - 25 Dec	Air Transat
01 Dec - 08 Dec	Air Canada
25 Dec - 01 Jan	Air Transat
28 Dec - 04 Jan	Air Transat
26 Dec - 02 Jan	Air Transat	direct
27 Dec - 03 Jan	Air Transat
29 Dec - 05 Jan	Air Canada
30 Dec - 06 Jan	Air Canada

Also check the deals for one-way flights from Montreal to Cayo Coco 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 Cayo Coco in December from $449

Return flights