Sounds Air's service between Wanganui and Wellington has been cancelled for lack of passengers.
The last flights will be on May 15.
The airline took over the service when Air New Zealand pulled out in September 2013. Picton-based Sounds Air began the run on January 21 last year with a cheapest one-way adult ticket of $125 and two return flights daily to Wellington.
Sounds Air managing director Andrew Crawford said in a press release that despite marketing efforts to promote the service, it has not been sustainable. Customers with pre-purchased Sounds Air flights will be fully refunded.
"We have done what we can to keep this service running locally but in any location around the world where someone can drive to a main city in less than three hours, air link services seem to struggle.