The calculated distance (air line) between Uthai Thani and Nakhon Ratchasima is approximately 141 miles respectively 228 kilometers.
By car or train, the actual journey to Nakhon Ratchasima is certainly longer, as only the direct route (as the crow flies) between Uthai Thani and Nakhon Ratchasima has been calculated here.
Air line (approximately)
228 kilometers
123 nautical miles