The calculated distance (air line) between Chon Daen and Samut Prakan is approximately 180 miles respectively 290 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Chon Daen and Samut Prakan has been calculated here.
Air line (approximately)
290 kilometers
156 nautical miles