Fiji Airways and Hawaiian Airlines have Auckland on sale from Los Angeles and San Francisco with ticket prices around $697 for departures through most of 2019. Mid-June and July have least low fare availability. Expedia has ticket prices as low as $640 on some dates. There are Fiji Airways itineraries with overnight layovers in Nadi and Hawaiian itineraries with overnight in Honolulu at no extra charge.
Fiji Airways books in economy T class which includes one free checked bag and earns 50% Alaska Mileage Plan flight miles.
Fiji Airways San Francisco SFO – Nadi NAN, Fiji – Auckland AKL – NAN – SFO
Hawaiian Airlines Los Angeles LAX – Honolulu HNL (ovenight) – Auckland AKL – HNL – LAX