The calculated distance (air line) between Phra Pradaeng and Hua Hin is approximately 85 miles respectively 136 kilometers.
By car or train, the actual journey to Hua Hin is certainly longer, as only the direct route (as the crow flies) between Phra Pradaeng and Hua Hin has been calculated here.
Air line (approximately)
136 kilometers
73 nautical miles