Need 3200 Krisflyer miles before the 31 Oct for Gold. Any Ideas?

Currently Qantas Gold but looking at moving to Singapore Airlines and Virgin. Unfortunately I have miscalculated my points earning after my latest trip to the US with Air New Zealand and lack 3200 points. A return economy to Singapore will take care of this but I am hesitant to fork out 1100 AUD and a weekend of flying. Ideas welcome. I am based in Brisbane.

$577 return Brisbane to Christchurch with a 1 stop in Auckland during the leg, should just crack the 3200 mile mark? Looked at day trip On Sat 29/10/16? might need someone else to to clarify

Thank you, I will look into that.