You must take a few steps to cancel or refund a Qantas Airways flight. You must first inform the airline in this regard, and you must also cancel any linked hotel or car arrangements. It would help if you got in touch with your credit card provider to ensure the refund is handled correctly. The only thing passengers need to do is call Qantas customer service at –OTA: 1 800 227 4500 or +1-855-738-4459.You must take a few steps to cancel or refund a Qantas Airways flight. You must first inform the airline in this regard, and you must also cancel any linked hotel or car arrangements. It would help if you got in touch with your credit card provider to ensure the refund is handled correctly. The only thing passengers need to do is call Qantas customer service at –OTA: 1 800 227 4500 or +1-855-738-4459.