That's why I included the link to momondo.com in my prior post #12. I just tested that link and it works fine when I click it. Then entire your cities and date (I used SFO to SYD on Feb 26 returnning March 3 but similar or even lower prices on other dates). Good luck! If clicking doesn't work, just type
www.momondo.com into your web browser. Searching there will show prices for adjacent dates (from Feb 18 to March 8 in my example), if you want to see an entire year then just try more dates a few weeks apart. But prices now are at their lowest due to a price war triggered by AA starting service LAX-SYD, so you won't find much lower and it can be double that price in other months.