LATAM Airlines allows online check-in starting 48 hours before departure for most domestic flights and 96 hours before international flights, except flights to or from the United States, where online check-in opens 24 hours prior due to regulations. Online check-in closes 1 hour before domestic departures and 2 hours before international departures. You can check in through the LATAM website or mobile app by entering your booking code and last name, then download or print your boarding pass. Airport check-in counters open 2 hours before domestic flights and 3 hours before international flights, though at busy airports like São Paulo or Santiago, LATAM recommends arriving up to 4 hours early. Counters close 1 hour before domestic departures and 2 hours before international flights. Self-service kiosks are available at many airports and follow the same schedule as check-in counters. Passengers with special needs, unaccompanied minors, group bookings over nine passengers, or certain promotional fares must check in at the airport. Boarding gates close 20 minutes before departure, and passengers must arrive at the gate on time regardless of check-in method. LATAM recommends arriving at least 2 hours before domestic and 3 hours before international flights to complete baggage drop and security checks. Use the LATAM mobile app or website for faster check-in, but always allow extra time at the airport.