The calculated distance (air line) between That Phanom and Sawang Daen Din is approximately 91 miles respectively 146 kilometers.
By car or train, the actual journey to Sawang Daen Din is certainly longer, as only the direct route (as the crow flies) between That Phanom and Sawang Daen Din has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles