The calculated distance (air line) between Nakhon Ratchasima and Pattaya is approximately 163 miles respectively 262 kilometers.
By car or train, the actual journey to Pattaya is certainly longer, as only the direct route (as the crow flies) between Nakhon Ratchasima and Pattaya has been calculated here.
Air line (approximately)
262 kilometers
141 nautical miles