King's second and final season with the White Sox was 1990. He had a 12–4 win-loss record and posted a career–low ERA of 3.28, as he made 25 starts for the second consecutive year. In 151 innings, King's walk total dropped to 40 and he struck 70 opponents. He also hurled a pair of shutouts; against the Kansas City Royals on May 5 and against the Oakland Athletics on June 22. On December 4, 1990, Chicago sent King along with Shawn Hillegas to the Cleveland Indians. The White Sox received Cory Snyder and Lindsay Foster (who never made it to the MLB) in the deal.