Qantas is offering flights to Tokyo and Osaka, Japan from $842. Lots of dates from February to September 2018. Fares include bags, meals and seats. All flights have a short connection through Australia.
Wellington-Osaka $842 - Google Flights Skyscanner
Auckland-Osaka $842 - Google Flights Skyscanner
Christchurch-Osaka $842 - Google Flights Skyscanner
Auckland-Tokyo $842 - Google Flights Skyscanner
Christchurch-Tokyo $842 - Google Flights Skyscanner