Depends on the time of year, and if the PW planes are flying. Currently the 777-300ER's are flying Guam. They are not weight restricted and have lots of seats. Typically, the 777A's are flown to Guam, better seat mile costs, but are P&W powered. The A's are also regularly weight restricted, but not by much. Spring and summer, the planes are full, fall and winter, about 3/4 full. A lot of military back and forth.

However, the jump seat is always available. Unless you are flying for the Hawaii Guard, it will be at least a double leg commute. Once in a while, it is easier to go to NRT, then stateside rather than go through HNL.