The calculated distance (air line) between Sangkhla Buri and Nakhon Sawan is approximately 118 miles respectively 191 kilometers.
By car or train, the actual journey to Nakhon Sawan is certainly longer, as only the direct route (as the crow flies) between Sangkhla Buri and Nakhon Sawan has been calculated here.
Air line (approximately)
191 kilometers
103 nautical miles