The calculated distance (air line) between Bang Mun Nak and Udon Thani is approximately 186 miles respectively 299 kilometers.
By car or train, the actual journey to Udon Thani is certainly longer, as only the direct route (as the crow flies) between Bang Mun Nak and Udon Thani has been calculated here.
Air line (approximately)
299 kilometers
161 nautical miles