Are there nonstop flights from Wellington (WLG) to Koromiko (PCN)?

Yes. Sounds Air fly this route. Flight time is about 35m.

Wellington → Koromiko

Wellington International Airport (WLG) to Picton Aerodrome (PCN)・71 km

Nonstop flights available (1 airline). Flight time about 35m. Nonstop return flights also operate.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.