Join Date: Jul 2007
Location: San Francisco/Sydney
Programs: UA 1K/MM, Hilton Diamond, Marriott Something, IHG Gold, Hertz PC, Avis PC
Posts: 8,176
The QF transfer counter in SYD is fairly good with letting you change flights. Presuming you're on time, ask if they can move you to the earlier flight, and presuming there are seats available (in J it's certainly possible there won't be) and they will most likely move you.