The calculated distance (air line) between Prachuap Khiri Khan and Pak Kret is approximately 152 miles respectively 245 kilometers.
By car or train, the actual journey to Pak Kret is certainly longer, as only the direct route (as the crow flies) between Prachuap Khiri Khan and Pak Kret has been calculated here.
Air line (approximately)
245 kilometers
132 nautical miles