Chicago dominated the second half and won for the fifth time in the six games that Derrick Rose has missed with a groin injury.
The Bulls were coming off a loss to Denver, but have not suffered back-to-back setbacks this season.
Josh Smith scored 19 for Atlanta, which has lost two in a row.
The Hawks cut a 12-point halftime deficit to four early in the third period but Deng then paced a 12-0 Chicago run that decided he contest.
Chicago won three of the four meetings with the Hawks this season.