The calculated distance (air line) between Nakhon Ratchasima and Saraburi is approximately 85 miles respectively 136 kilometers.
By car or train, the actual journey to Saraburi is certainly longer, as only the direct route (as the crow flies) between Nakhon Ratchasima and Saraburi has been calculated here.
Air line (approximately)
136 kilometers
74 nautical miles