The calculated distance (air line) between Taphan Hin and Samut Prakan is approximately 182 miles respectively 292 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Taphan Hin and Samut Prakan has been calculated here.
Air line (approximately)
292 kilometers
158 nautical miles