ancel flight ticket with Latam Airlines: 1. Open, official website of latam airlines. 2. Go to Manage Booking Section. 3. Select your trip tab at top of the home page. 4. Enter your Reservations reference number & last name. 5. Choose your ticket you want to cancel. 6. Enter the cancel button. 7. With in 24 hours of working days your money will be refunded at your account.