Both Chilean and Argentinians speak spanish or a derivation of it called castellano, which is a little different from the spanish from Spain. Add to it the different accent. When you come here you will know what I am talking about. Many people know some English so you can communicate here, no problem.

Local Spanish
Chile Spanish is usually speaked rapidly, some tend not to modulate so well, seeming to swallow some

Getting Around...
Find here some typical phrases used when going around:

Food

Numbers

In case of Emergency