The calculated distance (air line) between Nakhon Nayok and Chon Buri is approximately 60 miles respectively 97 kilometers.
By car or train, the actual journey to Chon Buri is certainly longer, as only the direct route (as the crow flies) between Nakhon Nayok and Chon Buri has been calculated here.
Air line (approximately)
97 kilometers
52 nautical miles