The calculated distance (air line) between Traiskirchen and Neusiedl am See is approximately 26 miles respectively 41 kilometers.
By car or train, the actual journey to Neusiedl am See is certainly longer, as only the direct route (as the crow flies) between Traiskirchen and Neusiedl am See has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles