How to Cancel Avianca Flight- Under certain circumstances, you may cancel your flight and request a refund under Avianca Airlines' cancellation policy. Your fare type, the date of cancellation, and the cause for cancellation will all affect the cancellation cost. Depending on the fare terms of your ticket, refundable tickets may be canceled with or without a fee. L and XXL fares are non-refundable, but cancellations are free. Depending on your route, you may be able to cancel your XL fare for a cost. Tickets that are non-refundable (XS, S, and M) cannot be changed or refunded. If you decide to cancel, you will only receive a refund for the tax-related component of the fare; the remaining amount will be lost.