The calculated distance (air line) between Damnoen Saduak and Pak Kret is approximately 46 miles respectively 73 kilometers.
By car or train, the actual journey to Pak Kret is certainly longer, as only the direct route (as the crow flies) between Damnoen Saduak and Pak Kret has been calculated here.
Air line (approximately)
73 kilometers
40 nautical miles