The calculated distance (air line) between Myeik and Damnoen Saduak is approximately 118 miles respectively 190 kilometers.
By car or train, the actual journey to Damnoen Saduak is certainly longer, as only the direct route (as the crow flies) between Myeik and Damnoen Saduak has been calculated here.
Air line (approximately)
190 kilometers
102 nautical miles