The calculated distance (air line) between Prachuap Khiri Khan and Ratchaburi is approximately 119 miles respectively 191 kilometers.
By car or train, the actual journey to Ratchaburi is certainly longer, as only the direct route (as the crow flies) between Prachuap Khiri Khan and Ratchaburi has been calculated here.
Air line (approximately)
191 kilometers
103 nautical miles