The calculated distance (air line) between Nong Phai and Samut Prakan is approximately 168 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 Nong Phai and Samut Prakan has been calculated here.
Air line (approximately)
271 kilometers
146 nautical miles