The calculated distance (air line) between Phanom Thuan and Nakhon Pathom is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to Nakhon Pathom is certainly longer, as only the direct route (as the crow flies) between Phanom Thuan and Nakhon Pathom has been calculated here.
Air line (approximately)
51 kilometers
27 nautical miles