The Illini defense held Kent State scoreless until Shayne Hynes hit a 43-yard field goal with 8:30 left in the game.
Golden Flash quarterback Colin Reardon was 15 of 34 for 156 yards and threw three interceptions.
Illinois has faced off-field problems since a former player accused coach Tim Beckman of interfering in medical decisions. Beckman was fired on Aug. 28 after an investigation found evidence that he had. Beckman has denied any wrongdoing.