The calculated distance (air line) between Bang Mun Nak and Samut Prakan is approximately 169 miles respectively 271 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Bang Mun Nak and Samut Prakan has been calculated here.
Air line (approximately)
271 kilometers
146 nautical miles