The next major international airport is Frankfurt/Main (FRA), at a distance of 75 km. Kaub am Rhein can be reached by car and by train.
Further information can be found on the website of the Tagungshaus Elsenburg: Anreise nach Kaub am Rhein
Try to reach Rene Reifarth:
International: +49 175 4070537
Inside Germany: 0175 4070537