Kostelic came eighth and her chief rival, Anja Paerson of Sweden, finished in 17th position in today's season-ending giant slalom race in Lenzerheide, Switzerland.
Since only the best 15 skiers can win points in a World Cup final, Pearson was left without any points in the final race while Kostelic won 32, which was four points short of the victory.
Overall, Paerson won 1,359 points and Kostelic 1,356.