How about driving to Spokane Washington. Take the evening flight and arrive in Belize at noon the next day. Here is what I just took off Orbitz for a 2 week vacation. Leaves on a Friday night.
Select $309 + $355 taxes & fees = $664 USD per person
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Leave
Fri, Jan 14 Continental Airlines 7603
operated by UNITED EXPRESS/SKYWEST AIRLINES -- UA 6337
Depart: 6:18pm
Arrive: 8:22pm Spokane, WA (GEG)
San Francisco, CA (SFO)
2 stops Economy 2hr 4min Canadair View seats
Change planes. Time between flights: 3hr 53min
Continental Airlines 269
Depart: 12:15am
Arrive: 5:48am San Francisco, CA (SFO)
Houston, TX (IAH)
Economy 3hr 33min Boeing 737 View seats
Change planes. Time between flights: 4hr 32min
Continental Airlines 628
Depart: 10:20am
Arrive: 12:51pm Houston, TX (IAH)
Belize City, Belize (BZE)
Economy 2hr 31min Boeing 737 View seats
Total duration: 16hr 33min
This is an overnight flight.
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Return
Sat, Jan 29 Continental Airlines 651
Depart: 1:45pm
Arrive: 4:20pm Belize City, Belize (BZE)
Houston, TX (IAH)
2 stops Economy 2hr 35min Boeing 737 View seats
Change planes. Time between flights: 1hr 50min
Continental Airlines 570
Depart: 6:10pm
Arrive: 8:47pm Houston, TX (IAH)
San Francisco, CA (SFO)
Economy 4hr 37min Boeing 737 View seats
Change planes. Time between flights: 1hr 37min
Continental Airlines 7550
operated by UNITED EXPRESS/SKYWEST AIRLINES -- UA 6166
Depart: 10:24pm
Arrive: 12:20am San Francisco, CA (SFO)
Spokane, WA (GEG)
Economy 1hr 56min Canadair View seats
Total duration: 12hr 35min
This is an overnight flight.