The home side didn't defend with the same sort of aggression that helped them clinch the title in Dubai last week, as both Fiji and the All Blacks punched holes in the Blitzboks' defence in the quarter-final and semi-final respectively.
Australia fought back early in the second period with tries to Simon Kennewell and Lewis Holland reducing the deficit to 21-12 but that was as close as they got.
It's their first tournament victory on the circuit in 20 months.
McConnochie went over for a second try to give England a 12-5 lead but New Zealand came roaring back with a try soon after.
Blitzboks 12 - Tries: Philip Snyman, Cecil Afrika Conversion: Branco du Preez (1).
After going ahead against the U.S. through a Boyd Killingworth try, the Aussies couldn't contain Carlin Isles who snared three first half tries.
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