In order to change Qantas flight booking online, it is simple and easy. To begin, go to the official Qantas website and log in with your login information. To access your current reservation, go to the "Manage Booking" or "My Trips" area. Click on the "Change" or "Edit" option after selecting the flight you want to change. Afterward, subject to fare regulations and capacity, you can proceed to change your travel dates, times, or destinations. Once you have made the necessary adjustments, go over the new information and any taxes or fare variations that may have changed.