Six Flags Over Georgia Shuttle:

MARTA's Six Flags Over Georgia Express Shuttle / Bus Route 201 departs from the Hamilton E. Holmes Station and drops off across the street from the park entrance (intersection of Six Flags Parkway and South Service Road), it’s only a 12-minute ride. The service operates only on the days the park is open from approximately one hour before the park opens until approximately one hour after closing. The route runs every 40 minutes throughout the days it is operating. 

Details, cost and how to us the MARTA Breeze Card: www.itsmarta.com