From Auckland, Wellington or Christchurch International Airport, there are direct flights with Air New Zealand to Blenheim Airport, about 20 minutes’ drive from Picton. Affordable shuttles are available or you can rent a car.
Please visit https://www.wildernessguidesnz.com/shuttles/ to book a shuttle if required.
You can also catch either the Bluebridge or Interislander ferry service across Cook Strait which berths in Picton. Or you can catch the small commuter airline, Soundsair, which has a base at Wellington Airport.
From Christchurch a popular option is to catch the train with Kiwi Rail Scenic Journeys to Picton; there are also public buses and options to rent a car.