The calculated distance (air line) between Brest and Międzyrzec Podlaski is approximately 39 miles respectively 63 kilometers.
By car or train, the actual journey to Międzyrzec Podlaski is certainly longer, as only the direct route (as the crow flies) between Brest and Międzyrzec Podlaski has been calculated here.
Air line (approximately)
63 kilometers
34 nautical miles