The calculated distance (air line) between Pak Kret and Phra Khanong is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Phra Khanong is certainly longer, as only the direct route (as the crow flies) between Pak Kret and Phra Khanong has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles