The calculated distance (air line) between Soeng Sang and Krathum Baen is approximately 157 miles respectively 253 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Soeng Sang and Krathum Baen has been calculated here.
Air line (approximately)
253 kilometers
136 nautical miles