Retailer:
WestJet

 

WestJet – Hamilton (YHM) to Cancun (CUN) Mexico Non-stop $342 CAD Return

One departure flight on November 27th, the rest in early December.

Last return flight from Cancun on Christmas Day December 25th. A number of return flights before that date.

Lowest fare is $332 return.

Found on Google Flights.