From Auckland - Central bus to Warkworth then travel to Goat Island. 1 h 26 min $25.
Bus from Auckland to Goat Island
InterCity Coachlines operates a bus from Auckland to Goat Island every 4 hours. Tickets cost $9 - $23 and the journey takes 1 h 4 min. ManaBus.com also services this route 5 times a day.