The Salzburg Airport is easy and connected to town with a bus or taxi. There are direct flights into Salzburg from Frankfurt, Berlin, Cologne, Palma, Düsseldorf, Vienna, and Istanbul.
If you have difficulty finding a suitable flight into Salzburg, it is convenient to fly into Munich and then take a train to Salzburg, which will take about 2 hrs (30 minutes from airport to Munich train station, then about 1.5 hours from Munich to Salzburg).
You may also fly into Vienna and then take the train to Salzburg, which is ~2.5 hrs.
Once you get off the plane you can take either a cab or the bus. If you take a cab it will cost you about 15-20 Euros to get to the Congress Center. If you take the bus you will need a ticket. They are inexpensive, and can be purchased in the magazine shop (General Store) inside the airport. Ask for a bus ticket. It is less than 2 Euros. Then you will want to get on the #2 bus headed to town (going right, if your back is to the airport). Even if you get on the #2 bus going the other direction it makes a fairly quick loop back. It will take about 20 minutes before you pass the train station. Soon after that (2-4 minutes) the Congress Center will be on the right.
Salzburg Congress Center
Auerspergstraße 6 - 5020 Salzburg, AUSTRIA
Tel. 0043662 88987-0