The calculated distance (air line) between Tha Muang and Krathum Baen is approximately 47 miles respectively 75 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Tha Muang and Krathum Baen has been calculated here.
Air line (approximately)
75 kilometers
41 nautical miles