The first thing you do after canceling your vacation is to cancel your flight ticket. The cancellation process is very simple and will only take a few minutes of your time. However, before canceling an airline ticket, it is important to understand Qantas Airlines flight cancellations. Ticket cancellation system is beneficial in many aspects. You will be given an exact time to cancel your ticket, which will allow you to get a full refund. You must also understand the cost of cancellation. Passengers must cancel their flight ticket within 24 hours of booking. Qantas will offer full refunds to passengers who cancel their tickets within this time limit.