From Milan Orio al Serio Airport we offer shuttle service(10 minutes by car - ask when booking). Otherwise take Airport Bus to the Train Station of Bergamo.
There change bus either 7 (direction Celadina stop at bus stop 211) or 8 (direction Seriate stop at bus stop n. 141) . You can buy a 24h ticket (luggage included) or a 72h ticket (luggage included) and have use of all the buses downtown Bergamo included the cablecar. Buy the ticket at BergamoTourismOffice in the airport.