The calculated distance (air line) between Tha Ruea and Nakhon Sawan is approximately 88 miles respectively 141 kilometers.
By car or train, the actual journey to Nakhon Sawan is certainly longer, as only the direct route (as the crow flies) between Tha Ruea and Nakhon Sawan has been calculated here.
Air line (approximately)
141 kilometers
76 nautical miles