The calculated distance (air line) between Amphoe Sikhiu and Krathum Baen is approximately 130 miles respectively 209 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Amphoe Sikhiu and Krathum Baen has been calculated here.
Air line (approximately)
209 kilometers
113 nautical miles