Vonn, of Vail, Colo., posted the 10th victory of her career. Julia Mancuso of Olympic Valley, Calif., was third for the second day in a row.
It was first time an American woman has won two races on back-to-back days since Tamara McKinney won a giant slalom and slalom March 10-11, 1984 at Waterville Valley, N.H.
Vonn, who had won a downhill Friday, and Mancuso were 1-2 after the downhill portion of the "super combi." Mancuso was tied for second with defending champion and then-reigning World Cup points leader Nicole Hosp of Austria, but Hosp went out on her second run.
Vonn changed her name from Kildow in September after marrying 2002 Olympian Thomas Vonn,