Auckland Return to Changsha or Xi'an $511, Shanghai $530, Chengdu $549 via China Southern Airlines (March - July)
China Southern is offering cheap flights to China. Of note is Changsha which is $33 cheaper than last time and the cheapest posted on Cheapies. Xi'an is cheap but not as good as the Tianjin deal from March. Shanghai is cheap but been plenty of deals for cheaper fares in the past. Chengdu also cheap but has been cheaper.
Find the cheap dates on Google Flights then plug them into Skyscanner.