The calculated distance (air line) between Nakhon Ratchasima and Khon Kaen is approximately 113 miles respectively 182 kilometers.
By car or train, the actual journey to Khon Kaen is certainly longer, as only the direct route (as the crow flies) between Nakhon Ratchasima and Khon Kaen has been calculated here.
Air line (approximately)
182 kilometers
98 nautical miles