The calculated distance (air line) between Bang Bua Thong and Samut Prakan is approximately 25 miles respectively 40 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 Bua Thong and Samut Prakan has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles