The calculated distance (air line) between Brezová pod Bradlom and Piešťany is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Piešťany is certainly longer, as only the direct route (as the crow flies) between Brezová pod Bradlom and Piešťany has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles