The calculated distance (air line) between Bishkek and Bazar-Korgon is approximately 158 miles respectively 254 kilometers.
By car or train, the actual journey to Bazar-Korgon is certainly longer, as only the direct route (as the crow flies) between Bishkek and Bazar-Korgon has been calculated here.
Air line (approximately)
254 kilometers
137 nautical miles