The calculated distance (air line) between Samut Songkhram and Nakhon Pathom is approximately 28 miles respectively 45 kilometers.
By car or train, the actual journey to Nakhon Pathom is certainly longer, as only the direct route (as the crow flies) between Samut Songkhram and Nakhon Pathom has been calculated here.
Air line (approximately)
45 kilometers
24 nautical miles