United Airlines, Qantas and Delta with Virgin Australia have Sydney SYD, Melbourne MEL and Brisbane BNE priced from $725 to $767 round trip from Los Angeles LAX, San Francisco SFO and San Jose SJC for departures May-June, August-September.
United Airlines San Francisco SFO – Sydney SYD nonstop
Qantas Airways Los Angeles LAX – Sydney SYD nonstop
Delta Airlines San Jose SJC – Los Angeles LAX – Melbourne MEL – LAX – SJC
LAX – Melbourne flights operated by Virgin Australia.
Delta Airlines / Virgin Australia San Francisco SFO – LAX – Brisbane BNE – LAX – SFO