The calculated distance (air line) between Groß-Enzersdorf and Eisenstadt is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Eisenstadt is certainly longer, as only the direct route (as the crow flies) between Groß-Enzersdorf and Eisenstadt has been calculated here.
Air line (approximately)
40 kilometers
21 nautical miles