The calculated distance (air line) between Samut Prakan and Nakhon Ratchasima is approximately 138 miles respectively 223 kilometers.
By car or train, the actual journey to Nakhon Ratchasima is certainly longer, as only the direct route (as the crow flies) between Samut Prakan and Nakhon Ratchasima has been calculated here.
Air line (approximately)
223 kilometers
120 nautical miles