Singapore Airlines are offering cheap flights to Wellington. Dates are April, May & June 2019, more dates in February/March for + $20. This beats the last Singapore Air deal to Wellington by $21. Fares include bags, seat selection and meals.
Book directly with Singapore Air for $314 or use Momondo and save an extra ~$31 (iFly: $283). Find the cheap dates via Google Flights.
Remember to check out our sister site, ChoiceCheapies when you are there.
Just out of curiosity but why would you want to fly to Wellington via Singapore?!