I have attempted to use Qantas Price Promise twice. Both times - no luck.
There are lots of rules to follow - they will not approve the price match if you missed any one of them. Even worse, the price match request must be submitted by 11:59pm of the day you booked your ticket. If you happen to miss any details (such as time stamp) - too bad, it won't work for you.
Should you still want to go ahead, make sure you
- file the claim by 11:59pm of the day
- read the qantas price promise website very carefully, and make sure you have go through their checklist
I would not book it with Qantas - would book via cheaper Australian websites like Aunt Betty, or get Flight Center to price match.
Ok