How do I call Qantas from the US?

On the airline's official web page, from the section of the home page when you click on the Contact Us tab then, you can find many contact numbers here. By entering your country or region here, you can find the Qantas Airways customer service

contact number (select USA here). Then, by placing the call and following its IVR menu procedure, your call will connect to the airline's online help desk department, and the available person will help you find the solution to your queries as soon as possible.