You can fly into three large airports near Koblenz: Frankfurt, Cologne/Bonn and Duesseldorf.
The biggest one is the Frankfurt airport with the most frequent connections to Vallendar via train to Koblenz City or Montabaur. Montabaur is the station for the ICE bullet train which serves Frankfurt or Cologne in 25 minutes each. The station is 20 minutes away from Vallandar The other two airports have also very frequent connections to Koblenz or Montabaur main station.
From the A 61: At the intersection “Autobahnkreuz Koblenz” take the A 48, follow signs to Koblenz, butcross the Rhine River. Exit at Bendorf / Neuwied / Vallendar.
From the A3: At the „Autobahndreieck Dernbach“ take the A 48, follow signs to Koblenz. Leave at the exit Bendorf/Neuwied/Vallendar.
There is an underground parking garage next to WHU. If you use a navigation system please enter as destination address: Heerstrasse.
Get off the train at Koblenz main station (Koblenz Hauptbahnhof). Taxis or Kevag-Busses 7 and 8/8A (stop across the road) take you to Vallendar (exit: Vallendar Bahnhof).