How to Cancel Avianca Flight- Both online and offline cancellation options are available for Avianca airline tickets. To begin, you should go to the Avianca website. To easily cancel a booking, you must provide the necessary information in the "Manage Your Booking" area. Alternately, you might contact the air operator who is available. Then, inquire about the reversal procedure and provide the information requested on the call. You can also just go to the closest airport to cancel your flight.