The calculated distance (air line) between Pathum Thani and Nakhon Pathom is approximately 35 miles respectively 57 kilometers.
By car or train, the actual journey to Nakhon Pathom is certainly longer, as only the direct route (as the crow flies) between Pathum Thani and Nakhon Pathom has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles