The calculated distance (air line) between Bua Yai and Nakhon Sawan is approximately 153 miles respectively 245 kilometers.
By car or train, the actual journey to Nakhon Sawan is certainly longer, as only the direct route (as the crow flies) between Bua Yai and Nakhon Sawan has been calculated here.
Air line (approximately)
245 kilometers
132 nautical miles