The calculated distance (air line) between Kampong Thom and Krong Kep is approximately 159 miles respectively 255 kilometers.
By car or train, the actual journey to Krong Kep is certainly longer, as only the direct route (as the crow flies) between Kampong Thom and Krong Kep has been calculated here.
Air line (approximately)
255 kilometers
138 nautical miles