The calculated distance (air line) between Tha Muang and Nakhon Sawan is approximately 125 miles respectively 201 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 Muang and Nakhon Sawan has been calculated here.
Air line (approximately)
201 kilometers
108 nautical miles