The calculated distance (air line) between Uthai Thani and Nakhon Sawan is approximately 24 miles respectively 38 kilometers.
By car or train, the actual journey to Nakhon Sawan is certainly longer, as only the direct route (as the crow flies) between Uthai Thani and Nakhon Sawan has been calculated here.
Air line (approximately)
38 kilometers
21 nautical miles