The calculated distance (air line) between Iten and Ongata Rongai is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Ongata Rongai is certainly longer, as only the direct route (as the crow flies) between Iten and Ongata Rongai has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles