Belgian Railways (NMBS/SNCB) operates a train from Brussels to Vianden hourly. Tickets cost $12 - $19 and the journey takes 54 min. 2 other operators also service this route. Alternatively, RegioJet operates a bus from Brussels to Vianden once daily. Tickets cost $8 - $11 and the journey takes 3 h. 3 other operators also service this route.
From Bruxelles-Nord train to Liège-Guillemins, train to Ettelbruck, Gare routière 2, then line 570 bus to Vianden, Bréck. 4 h 46 min 21€. From Brusel, CCN, gare du Nord bus to Luxembourg, Gare routière, bus to Ettelbruck, Gare routière 2, then line 570 bus to Vianden, Bréck. 5 h 28 min 13€. From Brussels drive to Vianden. 2 h 21 min 26€.