The calculated distance (air line) between Nakhon Pathom and Phra Nakhon Si Ayutthaya is approximately 51 miles respectively 83 kilometers.
By car or train, the actual journey to Phra Nakhon Si Ayutthaya is certainly longer, as only the direct route (as the crow flies) between Nakhon Pathom and Phra Nakhon Si Ayutthaya has been calculated here.
Air line (approximately)
83 kilometers
45 nautical miles