you can reach Gstadt via the Munich – Salzburg railway line. Target stations are Bad Endorf, Prien or Traunstein. From Prien and Traunstein you have a choice of bus or taxi. From Bad Endorf you have to depend on the taxi. Prien and Bad Endorf are about 15 km from Gstadt and Traunstein is about 25 km away.
Chiemsee is located directly on the Autobahn A8 Munich – Salzburg. Please take the exits Prien or Traunstein from where you can reach Gstadt in about 20-30 minutes.