Qantas cancellation policy allows passengers to cancel or change their flights with varying fees depending on the fare type. For Flex and Business class tickets, changes are often more flexible, sometimes incurring no fees for modifications. However, Economy class tickets may have stricter conditions, and fees can apply. It's advisable to review the specific terms of your ticket or contact Qantas customer service for precise details on cancellation fees and conditions. Keep in mind that certain circumstances, such as medical emergencies, may qualify for exceptions to the standard cancellation policy.