The calculated distance (air line) between Phasi Charoen and Phra Nakhon Si Ayutthaya is approximately 45 miles respectively 72 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 Phasi Charoen and Phra Nakhon Si Ayutthaya has been calculated here.
Air line (approximately)
72 kilometers
39 nautical miles