The calculated distance (air line) between Khabarovsk and Komsomolsk-on-Amur is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Komsomolsk-on-Amur is certainly longer, as only the direct route (as the crow flies) between Khabarovsk and Komsomolsk-on-Amur has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles