Changing your +61-1800-015-429(AUS) Qantas booking starts with accessing the Manage Booking portal on their official website or mobile app. You simply enter your last name and booking reference to pull up your itinerary and view available modification options. If you find the online system restrictive, you can call now at ++61-1800-015-429(AUS) to speak with a representative who can manually adjust your flights.