Very regular buses are available between Corozal Town and Chetumal in Mexico, running about every 20 or 30 minutes during thhe day. The journey lasts about 1 hour and costs around US$1.25.
Fairly regular and inexpensive buses are also available to and from Belize City and Belmopan, as well as other destinations in the country.
Tropic Air
(http://www.tropicair.com/) and Maya Island Air (http://www.mayaairways.com/) offer flights on smaller prop-driven aircraft between Corozal and Belize City, San Pedro, and Caye Caulker, as well as many other less-traveled Belize towns.The Thunderbolt Ferry (http://ambergriscaye.com/...) runs between San Pedro and Corozal also stopping in Sarteneja if requested, twice daily in each direction. The trip takes about 1 1/2 to 2 hours.
