你可check austria public transportation website http://www.oebb.at/en/
只需 enter "salzburg hbf" to "salzburg airport", then it will show route.
你基本上坐 bus 260 或 o-b-2 時間由15mins to 23 mins.
The city bus no. 2 goes at regular intervals (every 10 min.) between Salzburg main railway station and Salzburg Airport. Sundays and public holidays every 20 min. Journey time approx. 20 min.
Costs: single ticket € 2,- (children € 1,-). Tickets available at "Newscorner" in the terminal or at bus driver.
Citybus Salzburg