The calculated distance (air line) between Roi Et and Nakhon Ratchasima is approximately 128 miles respectively 205 kilometers.
By car or train, the actual journey to Nakhon Ratchasima is certainly longer, as only the direct route (as the crow flies) between Roi Et and Nakhon Ratchasima has been calculated here.
Air line (approximately)
205 kilometers
111 nautical miles