The calculated distance (air line) between Bruck an der Mur and Sankt Pölten is approximately 57 miles respectively 91 kilometers.
By car or train, the actual journey to Sankt Pölten is certainly longer, as only the direct route (as the crow flies) between Bruck an der Mur and Sankt Pölten has been calculated here.
Air line (approximately)
91 kilometers
49 nautical miles