Trans-Pacific availability on QANTAS is usually limited so they might look at doing what I've done in the past when flying to Perth by taking Cathay Pacific through Hong Kong on a routing of; DFW-(LAX or SFO or YVR)-HKG-PER.
It's a longer trip (with an early morning arrival and late evening departure at HKG) but you can make that into lemonade by spending the day playing tourist or shopping.
(edited to correct spelling)
[This message has been edited by greggwiggins (edited 09-23-2002).]