car:

From the east: A2 motorway, exit Pörtschach
From the west: A12 motorway, A10 motorway, exit Pörtschach
From the north: A10 motorway, exit Pörtschach

train:

Pörtschach train station

airplane:

Klagenfurt airport, direct flights to Vienna, Zurich, Hamburg
Shuttle service from the airport (free with a stay of 4 or more days)
Charter flights from Hamburg, Dusseldorf, Berlin, Frankfurt, Zurich, Amsterdam, Munich