Asiana Airlines Airlines Airlines has a 24 hour cancellation policy. This policy is in place to protect the airline’s customers and to ensure that everyone has a fair chance at a seat on a flight. If you need to cancel your reservation, be sure to do so within 24 hours of your flight to avoid any penalties. The only thing passengers need to do is call, Asiana airlines customer service... https://skynair.com/blog/can-i-cancel-my-asiana-airlines-flight-and-get-a-full-refund/