If you have Amex membership rewards then it's around 20k BA Avios (which is the same currency as Qatar now) in business across to Perth from the east coast. One of the sweet spots on their award chart!
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Ah, yes you're right - 22,000 vs 38,750.From memory, the zone change is at 2000 miles one way. Thus MEL/CBR-PER are the sweet spots (and of course ADL), being <2000 mi, whist BNE/SYD-PER costs considerably more as they are both > 2000 mi.
Handy for PC members…a couple of weeks ago, I was searching for CBR-CGK flights.
Every option the QF site gave me was with 2 domestic flights. If it wanted to send me to QF41 from SYD, it would send me via MEL. If it wanted to offer QF39 from MEL, it sent me via SYD.