The airport of Leipzig-Halle is the closest to Nordhausen (1 hour by car). Most of the big international companies fly to this airport. At a similar distance there are two other airports, Magdeburg-Cochstedt and Erfurt. Smaller airlines like Ryanair fly to these airports. By car, it’s possible to arrive in Nordhausen in 90 minutes from the airport of Hannover and in 3 hours from Frankfurt.