The calculated distance (air line) between Brest and Radzyń Podlaski is approximately 51 miles respectively 81 kilometers.
By car or train, the actual journey to Radzyń Podlaski is certainly longer, as only the direct route (as the crow flies) between Brest and Radzyń Podlaski has been calculated here.
Air line (approximately)
81 kilometers
44 nautical miles