The calculated distance (air line) between Sung Noen and Krathum Baen is approximately 135 miles respectively 218 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Sung Noen and Krathum Baen has been calculated here.
Air line (approximately)
218 kilometers
118 nautical miles