Originally Posted by
amolkold
I think your best bet is AA - 62.5K miles for one-way Biz, North America -> Australia. You could do something like BOS-LAX on AA, then LAX-SYD on Qantas. However, you would have to look early. Since you have 30K miles, a 50K credit card offer would do the trick.
UA costs 67.5K miles, and you may be able to route via Asia. Air New Zealand can also work.
*Edited no-coffee typos.
Added emphasis here. Finding a Biz or First award on Qantas with AA mile is extremely difficult. You will not only have to book very early, you will also need to be flexible on your dates. Actually, if you have enough miles, you may have better luck going USA-Hong Kong-Sydney. It costs more miles, but is a bit easiesr tha USA-Australia.