roundtrip tickets can run upwards of $200, depending on flight availability and what-not, mind you, this is only a short 50-minute flight. A roundtrip ticket to the mainland, a minimum of 5 hours and how many 1000s of miles, can go as little as $200-something. (sometimes even $99 oneway to Vegas)!!
AND, since Oahu is the main island, if you live on an outer island, you have to fly there first to catch a connecting flight to another island, they recently cancelled all direct flights to other islands. That's a bitch.