I believe the CUN flights actually route thru Guatemala City, plane chg to El Salvador, then another plane chg to BZE - and arrives the next day - all for one exhorbitant price, let alone losing a day. Better to take the Bus from Cancun to Chet, cross the border and fly into SP - still not quick, but quicker & cheaper by tons.
Unless service has changed VERY recently, there is no direct flight from Cancun to Belize.
Anyone know if the Guat flag carrier runs Cancun to Guat City?