Germany, the Netherlands, Denmark,... (north/west):
From Munich take the A8 motorway towards Salzburg, from Salzburg take the A10 Tauern motorway towards Villach, take the Flachau exit
Vienna, the Czech Republic, Slovakia, Hungary,... (Oeast):
Take the A1, the west motorway, towards Salzburg, from Salzburg take the A10 Tauern motorway towards Villach, take the Flachau exit
Italy, Slovenia, Croatia,... (south):
Take the A10 Tauern motorway towards Salzburg, take the Flachau exit
By train
Salzburg railway station - about 45 min. away
Bischofshofen railway station - about 25 min. away
Radstadt railway station - about 15 min. away
Altenmarkt railway station - about 10 min. away
By plane
Salzburg airport, "W. A. Mozart - Airport" - about 45 min. away