The calculated distance (air line) between Nong Bua and Krathum Baen is approximately 154 miles respectively 248 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Nong Bua and Krathum Baen has been calculated here.
Air line (approximately)
248 kilometers
134 nautical miles