The calculated distance (air line) between Międzyrzec Podlaski and Kielce is approximately 121 miles respectively 194 kilometers.
By car or train, the actual journey to Kielce is certainly longer, as only the direct route (as the crow flies) between Międzyrzec Podlaski and Kielce has been calculated here.
Air line (approximately)
194 kilometers
105 nautical miles