The calculated distance (air line) between Rejon ulicy Mieleckiej and Kielce is approximately 158 miles respectively 255 kilometers.
By car or train, the actual journey to Kielce is certainly longer, as only the direct route (as the crow flies) between Rejon ulicy Mieleckiej and Kielce has been calculated here.
Air line (approximately)
255 kilometers
138 nautical miles