The calculated distance (air line) between Brezová pod Bradlom and Trenčín is approximately 28 miles respectively 45 kilometers.
By car or train, the actual journey to Trenčín is certainly longer, as only the direct route (as the crow flies) between Brezová pod Bradlom and Trenčín has been calculated here.
Air line (approximately)
45 kilometers
24 nautical miles