Fort Benning is located in SW Georgia. The Alabama State line is just to the west across the Chattahoochee River. It is located at the south end of the city of Columbus. It is located approximately 100 miles south of Atlanta Hartsfield International Airport.
From Hartsfield International, take ramp (left) onto I-285/Atlanta Airport/Montgomery
At Exit 61, turn Right onto Ramp towards I-85/Atlanta/Montgomery
Take ramp left onto I-85 towards I-85/Columbus/Montgomery
At exit 21 take ramp (right) onto I-185 towards I-185 Columbus
Fort Benning is directly at the end of I-185 South.