The calculated distance (air line) between Chai Badan and Nakhon Sawan is approximately 75 miles respectively 121 kilometers.
By car or train, the actual journey to Nakhon Sawan is certainly longer, as only the direct route (as the crow flies) between Chai Badan and Nakhon Sawan has been calculated here.
Air line (approximately)
121 kilometers
65 nautical miles