Are flight delays from Easter Island to Santiago on LAN airline common? Planning a short turn around time in Santiago airport before our return flight to the US in Feb 2015. Am I asking for trouble? I can't find useful information on the internet. Any personal experiences or helpful websites? I can't wait to visit Chile and Easter Island!

You are asking for trouble. There are fairly frequent delays, although usually not long ones. But I would never connect from a domestic to an international flight from anywhere in Chile, especially Easter Island.