The calculated distance (air line) between Phai Sali and Krathum Baen is approximately 137 miles respectively 220 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Phai Sali and Krathum Baen has been calculated here.
Air line (approximately)
220 kilometers
119 nautical miles