The calculated distance (air line) between Liptovský Hrádok and Piešťany is approximately 92 miles respectively 147 kilometers.
By car or train, the actual journey to Piešťany is certainly longer, as only the direct route (as the crow flies) between Liptovský Hrádok and Piešťany has been calculated here.
Air line (approximately)
147 kilometers
80 nautical miles