The calculated distance (air line) between Ban Khlong Prawet and Thung Khru is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Thung Khru is certainly longer, as only the direct route (as the crow flies) between Ban Khlong Prawet and Thung Khru has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles