Go through your results for flights to Wanganui in New Zealand with Netflights.
Flexible on dates? Conducting your search by month allows you to compare prices to Wanganui throughout the year. Accommodation prices will also be higher at this time of year.
So, if the flights to Wanganui don't work for you, you could always try searching for flights to other airports in New Zealand.
You can also broaden your search by looking at more than one departure airport. Have a look around – you might be able to save by flying from a different airport or city.