The flight time from Pittsburgh International Airport to Auckland Airport is about 17 hours.
19hr 45min Auckland (AKL) to Dubai (DXB) by a direct flight operated by Emirates Airlines. The flight stops at Sydney (SYD).
Auckland (AKL) to Santiago (SCL) Shortest Flight Duration 11 hours 30 mins
There are 298 air miles between WLG and AKL, New Zealand. This corresponds to a flight time of approximately 1 hour and 6 minutes.
The time required for flight between the above places is 3.25 hrs. Average speed of 500 miles/hour is used to calculate the time. This time is inclusive of the landing and take off times. However, the time required for the baggage and security checking has not been added. The actual time may change depending on the flight path chosen.
The only non-stop flight between the two countries is between Vancouver (YVR) and Auckland (AKL). The flight is 11300km (7000mi) and takes 14 hours westbound (i.e. YVR to AKL) and 13hr 15min eastbound (i.e. AKL to YVR).
The flight time from Ronald Reagan Washington National Airport to Auckland Airport is about 17 hours, 15 minutes.
Kuala Lumpur (KUL) to Auckland (AKL)Shortest Flight Duration 10 hours 10 mins
The flight will take 13h 2min. I used the travel calculator online (TravelMath).
The flight time from LAX to Sydney Kingsford Smith Airport is about 15 hours.
Honolulu, HI (HNL) to Auckland (AKL)Shortest Flight Duration 9 hours 20 mins
11hr 30min Shanghai Pu Dong (PVG) to Auckland (AKL) nonstop by Air New Zealand or Air China.
A random search for flights from San Francisco (SFO) to Melbourne (MEL) shows: OPTION 1: 18hr 40min via Auckland (AKL) [Also perhaps the cheapest] SFO - AKL Air New Zealand Flt 007 Dep 09:00pm 17Oct,Sat AKL - MEL Air New Zealand Flt 123 Dep 07:50am 19Oct,Mon Flight Duration: 17hr 05min; Layover Time: 1hr 35min; Total Trip Time: 18hr 40min