Flying Route to NZ
We flew to NZ with Korean Airlines via Seoul, because it was the cheapest option we could get. The flight prices themselve were pretty similar but the taxes were much lower for some reason with that option.
The best thing about Seoul airport was that there is a Transit Hotel in the transfer lounge. Basically you can get a hotel room while you're waiting for your flight to Auckland and have a sleep and shower between flights. Can't remember the exact cost but very reasonable and totally worth it on such a long journey.
The food wasn't great with Korean Airlines though, one 'western' option and one korean.
C