The calculated distance (air line) between Wang Saphung and Nakhon Sawan is approximately 154 miles respectively 249 kilometers.
By car or train, the actual journey to Nakhon Sawan is certainly longer, as only the direct route (as the crow flies) between Wang Saphung and Nakhon Sawan has been calculated here.
Air line (approximately)
249 kilometers
134 nautical miles