The calculated distance (air line) between Kaga-Bandoro and Bossembélé is approximately 159 miles respectively 256 kilometers.
By car or train, the actual journey to Bossembélé is certainly longer, as only the direct route (as the crow flies) between Kaga-Bandoro and Bossembélé has been calculated here.
Air line (approximately)
256 kilometers
138 nautical miles