How can I know whether I can make a same day flight change?
You may choose the Same day flight change service if your ticket was issued for a domestic route within Chile, Argentina, Peru, Colombia, Ecuador and Brazil.
It is valid for same day flight changes, with the same origin and destination, as long as you haven't already checked your baggage at the LATAM airport counter. This service is activated at 12:00 a.m. on the day of your flight. You can make the change up to 1 hour before your original flight departure time.
This service is not available if your trip has special services that require confirmation 24 hours in advance, special conditions that require medical certification or if you bought a Promo fare ticket.