The calculated distance (air line) between Esch-sur-Alzette and Schengen is approximately 17 miles respectively 28 kilometers.
By car or train, the actual journey to Schengen is certainly longer, as only the direct route (as the crow flies) between Esch-sur-Alzette and Schengen has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles