The calculated distance (air line) between Kaset Sombun and Udon Thani is approximately 96 miles respectively 154 kilometers.
By car or train, the actual journey to Udon Thani is certainly longer, as only the direct route (as the crow flies) between Kaset Sombun and Udon Thani has been calculated here.
Air line (approximately)
154 kilometers
83 nautical miles