Easter Island flights: language matters

I'd thought about going to Easter Island during my winter break next month (I have 2 weeks off). It's closer than usual, and supposedly not too expensive to get to: a few hundred dollars out of Santiago. Except, when I checked the LAN Airlines site, it quoted me US$2000 to get there. I can spend 3 weeks living well in Argentina for that.

Tonight I checked again, this time selecting "Chile" instead of "USA (English)." The results, on the exact same website (http://www.lan.com), in Chilean pesos, were...US$1500 cheaper. And there are more flights available.

Okay, then.