The calculated distance (air line) between Brezová pod Bradlom and Bratislava is approximately 41 miles respectively 66 kilometers.
By car or train, the actual journey to Bratislava is certainly longer, as only the direct route (as the crow flies) between Brezová pod Bradlom and Bratislava has been calculated here.
Air line (approximately)
66 kilometers
35 nautical miles