The calculated distance (air line) between Wichian Buri and Samut Prakan is approximately 146 miles respectively 236 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Wichian Buri and Samut Prakan has been calculated here.
Air line (approximately)
236 kilometers
127 nautical miles