Williams, the second seed, beat third seeded Vera Zvonareva 2-0 Saturday in the semifinal.
It is the second year in a row Williams has made the final. Last year she retired from the final with a stomach muscle injury.
Fourth-seeded Svetlana Kuznetsova of Russia defeated ninth-seeded Francesca Schiavone of Italy, who had eliminated defending champion Amelie Mauresmo of France in the quarterfinals.