The calculated distance (air line) between Ongata Rongai and Upper Gilgil is approximately 89 miles respectively 142 kilometers.
By car or train, the actual journey to Upper Gilgil is certainly longer, as only the direct route (as the crow flies) between Ongata Rongai and Upper Gilgil has been calculated here.
Air line (approximately)
142 kilometers
77 nautical miles