The calculated distance (air line) between Piešťany and Liptovský Mikuláš is approximately 88 miles respectively 142 kilometers.
By car or train, the actual journey to Liptovský Mikuláš is certainly longer, as only the direct route (as the crow flies) between Piešťany and Liptovský Mikuláš has been calculated here.
Air line (approximately)
142 kilometers
77 nautical miles