As for most places of Germany, Plön is connected to an extensive network.
By plane
The closest airports are Hamburg and Lübeck European routes only.
By bike
Additionally, it is possible to use the bike. However, it is advisable to stay of the federal roads Bundesstrasse, "B" and use smaller alternatives or bike tramps Fahrradwege
By Rail
Regular once a hour 5am-1am trains leave from Kiel and Lübeck.
By car
If you are traveling by car, you should head towards Kiel or Neumünster from the north / Denmark and follow the federal road B76 from Kiel to Lübeck or B430 from Neumünster to Plön. From the south, head for Hamburg and continue to Lübeck, than just follow the B76 towards Kiel.
By bus
There are several daily connection from Kiel, Lübeck and Neumünster as well as many regional villages and cities. The operator is Verkehrsbetriebe Kreis Plön VKP or Autokraft.