The calculated distance (air line) between Strasshof an der Nordbahn and Mödling is approximately 24 miles respectively 38 kilometers.
By car or train, the actual journey to Mödling is certainly longer, as only the direct route (as the crow flies) between Strasshof an der Nordbahn and Mödling has been calculated here.
Air line (approximately)
38 kilometers
20 nautical miles