The calculated distance (air line) between Sangkhla Buri and Phra Pradaeng is approximately 173 miles respectively 279 kilometers.
By car or train, the actual journey to Phra Pradaeng is certainly longer, as only the direct route (as the crow flies) between Sangkhla Buri and Phra Pradaeng has been calculated here.
Air line (approximately)
279 kilometers
151 nautical miles