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