The calculated distance (air line) between Tha Muang and Nakhon Pathom is approximately 29 miles respectively 46 kilometers.
By car or train, the actual journey to Nakhon Pathom is certainly longer, as only the direct route (as the crow flies) between Tha Muang and Nakhon Pathom has been calculated here.
Air line (approximately)
46 kilometers
25 nautical miles