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