“I just tried to make the points and whenever I felt I had the opportunity to step up and accelerate a little bit, I tried to keep the pressure on her," said the second seed Belgian, who won the 2009 US Open after a two years' break.
The three-time champ first won the New York honours in 2005.
Clijsters will be clashing against Vera Zvonareva of Russia in the finals at Flushing Meadows on Saturday, Sep 11.
Zvonareva, who was also a Wimbledon finalist, defeated top seed Caroline Wozniacki 6-4, 6- 3 to march into her second Grand Slam final this season.
Odds favour Clijsters as Zvonareva has lost both their earlier meetings this season at Wimbledon and Canada.