The calculated distance (air line) between Rongo and Ongata Rongai is approximately 156 miles respectively 251 kilometers.
By car or train, the actual journey to Ongata Rongai is certainly longer, as only the direct route (as the crow flies) between Rongo and Ongata Rongai has been calculated here.
Air line (approximately)
251 kilometers
135 nautical miles