American Airlines has a deal from San Francisco SFO and San Jose to Auckland for $760 or Sydney $770 with connection via LAX for AA#73 nonstop flight LAX-Sydney. Qantas provides the connecting flight to Auckland.
Travel Departure Dates: November 2017 – June 8, 2018.
American Airlines ticket SFO-AKL $760
San Francisco SFO – Los Angeles LAX – Sydney SYD – Auckland AKL – SYD – LAX – SFO
American Airlines ticket SJC-SYD $770
San Jose SJC – Los Angeles LAX – Sydney SYD – LAX – SJC
LAX ticket prices are $800 round trip.
Hawaiian Airlines has similar $760 fares to American on limited dates.