New York Return from Auckland $1345, Wellington $1342, Christchurch $1301 via Qantas or United (June & Oct '17 - Mar '18)
Qantas/American Airlines & United are both offering cheap flights to New York. October & later it starts to get a bit cold however June is the best time to visit NY. Includes bags & meals. Air NZ are offering these flights for double the price.
Best to have a look at the flights in Google Flights then plug them into Skyscanner, Momondo, etc. Qantas flights fly to Australia and then onto LA. United goes direct to LA then onwards.