The calculated distance (air line) between Samut Songkhram and Samut Prakan is approximately 42 miles respectively 67 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Samut Songkhram and Samut Prakan has been calculated here.
Air line (approximately)
67 kilometers
36 nautical miles