We had a 3:15 p.m. flight home on a Friday and left Aulani shortly after 11 a.m. I'll give you some details on our experience. We drove to the airport, returned the rental car to Enterprise and rode the shuttle to the airport all by about noon. From there, it was another 60-90 minutes, IIRC, to get checked in, through security and to the gate (we were at one of the furthest gates, so a bit of a walk). There wasn't much of a wait for the Hawaiian Air kiosk to get checked in but the line to drop our checked luggage extended outside the building. Then from that line was the security line, which was one of the longer ones I've ever experienced (again extending out the building). Then there's the walk to the gate with a stop for the Agriculture inspection (just another quick run of your carry on through a screener). By the time we got to the gate we had a bit of time to grab something to eat, one last round in the shops, bathroom breaks, then boarding started around 2:30. I think we could've left a little bit later and still been fine but I wanted to leave a buffer and if I had to do it again I'd probably do the same timing. HTH