The calculated distance (air line) between Ban Nong Wua So and Udon Thani is approximately 31 miles respectively 49 kilometers.
By car or train, the actual journey to Udon Thani is certainly longer, as only the direct route (as the crow flies) between Ban Nong Wua So and Udon Thani has been calculated here.
Air line (approximately)
49 kilometers
27 nautical miles