The calculated distance (air line) between Piešťany and Banská Bystrica is approximately 61 miles respectively 99 kilometers.
By car or train, the actual journey to Banská Bystrica is certainly longer, as only the direct route (as the crow flies) between Piešťany and Banská Bystrica has been calculated here.
Air line (approximately)
99 kilometers
53 nautical miles