FYI I got an email from the Belize Tourism Board with what looks like some great airfares:
Airfares to Belize City (BZE)
* Cincinnati, OH $234 RT Includes all taxes (American)
* Seattle, WA $380 RT Includes all taxes (Continental)
* Dallas, TX $246 RT Includes all taxes (Delta)
* Houston IAH, TX $306 RT Includes all taxes (Delta)
* Newark, NJ $351 RT Nonstop flights, Includes all taxes (Continental)
* Chicago O'Hare, IL $458 RT Includes all taxes (Delta, US Airways)
* Atlanta, GA $223 RT Includes all taxes (Delta)
* Boston, MA $380 RT Includes all taxes (Delta, US Airways)
* Orlando, FL $366 RT Includes all taxes (Delta, US Airways)
* Washington National, DC $340 RT Includes all taxes (Continental)
* Washington Dulles, DC $346 RT Includes all taxes (Continental, Delta, US Airways)
* Philadelphia, PA $326 RT Includes all taxes (Delta, US Airways)
* Charlotte, NC $338 RT Includes all taxes (Delta)
* Detroit, MI $349 RT Includes all taxes (Continental)
* Denver, CO $360 RT Includes all taxes (Continental)
* Tampa, FL $366 RT Includes all taxes (Delta, US Airways)
* Salt Lake City, UT $245 RT Includes all taxes (American)
* St Louis, MO $249 RT Includes all taxes (Delta)
* Cleveland, OH $355 RT Includes all taxes (US Airways)
Airfares to Belize City (BZE)
* Cincinnati, OH $234 RT Includes all taxes (American)
* Seattle, WA $380 RT Includes all taxes (Continental)
* Dallas, TX $246 RT Includes all taxes (Delta)
* Houston IAH, TX $306 RT Includes all taxes (Delta)
* Newark, NJ $351 RT Nonstop flights, Includes all taxes (Continental)
* Chicago O'Hare, IL $458 RT Includes all taxes (Delta, US Airways)
* Atlanta, GA $223 RT Includes all taxes (Delta)
* Boston, MA $380 RT Includes all taxes (Delta, US Airways)
* Orlando, FL $366 RT Includes all taxes (Delta, US Airways)
* Washington National, DC $340 RT Includes all taxes (Continental)
* Washington Dulles, DC $346 RT Includes all taxes (Continental, Delta, US Airways)
* Philadelphia, PA $326 RT Includes all taxes (Delta, US Airways)
* Charlotte, NC $338 RT Includes all taxes (Delta)
* Detroit, MI $349 RT Includes all taxes (Continental)
* Denver, CO $360 RT Includes all taxes (Continental)
* Tampa, FL $366 RT Includes all taxes (Delta, US Airways)
* Salt Lake City, UT $245 RT Includes all taxes (American)
* St Louis, MO $249 RT Includes all taxes (Delta)
* Cleveland, OH $355 RT Includes all taxes (US Airways)