The calculated distance (air line) between Kampong Thom and Kampong Cham is approximately 63 miles respectively 101 kilometers.
By car or train, the actual journey to Kampong Cham is certainly longer, as only the direct route (as the crow flies) between Kampong Thom and Kampong Cham has been calculated here.
Air line (approximately)
101 kilometers
55 nautical miles