The calculated distance (air line) between Bua Yai and Samut Prakan is approximately 184 miles respectively 296 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Bua Yai and Samut Prakan has been calculated here.
Air line (approximately)
296 kilometers
160 nautical miles