Originally Posted by
Tankengine
You do realise Qantas doesn't even fly some of the routes you mention?
Start talking codesharing and prices from different countries and of course you will get differences.
Try a travel agent forum for answers.
Never use a travel agent, they own your booking till the first sector is ( has been ticketed (boarding pass issued) only after that if things go wrong you can have ANY say.
Before that the Flight Centres and the like own you and your ticket/s