The calculated distance (air line) between Magadi and Ongata Rongai is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Ongata Rongai is certainly longer, as only the direct route (as the crow flies) between Magadi and Ongata Rongai has been calculated here.
Air line (approximately)
77 kilometers
42 nautical miles