The calculated distance (air line) between Mueang Nonthaburi and Phra Nakhon Si Ayutthaya is approximately 34 miles respectively 55 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 Mueang Nonthaburi and Phra Nakhon Si Ayutthaya has been calculated here.
Air line (approximately)
55 kilometers
30 nautical miles