The calculated distance (air line) between Damnoen Saduak and Samut Prakan is approximately 44 miles respectively 70 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Damnoen Saduak and Samut Prakan has been calculated here.
Air line (approximately)
70 kilometers
38 nautical miles