by BTW on Sat Sep 15, 2007 5:54 pm
It's not easy. During peak season there's sometimes charter planes that fly from Cancun to Belize city, but they have no proper schedules so you won't be able to plan that in advance.
Your only real choice is to go by bus from Cancun to Belize City (about 6 hours) and change bus onwards to Placencia (about 3-4 hours more).