The calculated distance (air line) between Nakhon Ratchasima and Kalasin is approximately 138 miles respectively 221 kilometers.
By car or train, the actual journey to Kalasin is certainly longer, as only the direct route (as the crow flies) between Nakhon Ratchasima and Kalasin has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles