After losing two of their first three games of the season, the 76ers have captured 10 out of 12 and have the only winning record among Atlantic Division teams. Atlanta had a four-game winning streak snapped.
Philadelphia trailed by eight heading into the second half, and then outscored Atlanta in the third period 25-10.
Thaddeus Young had 20 points for the 76ers, Jrue Holliday scored 16 points to go with 11 assists and Meeks produced all of his 12 points from beyond the arc.
The 76ers shot only 41 percent from the field, but they outrebounded the Hawks by 19.
Willie Green had 14 points to lead Atlanta.