The 18-year-old Dane began August by getting her first WTA Tour win in Stockholm, then reached the third round at the Olympics, where she lost to eventual gold medalist Elena Dementieva.
"It was just an amazing experience that you just don't get every day,'' she said. "Now I'm in the finals again. It's been a good month for me.''
In the men's draw, American Mardy Fish upset top-seeded Fernando Verdasco of Spain 6-0, 1-6, 6-3 to advance to his second straight Pilot Pen final.
Wozniacki broke Cornet in the 12th game to take the first set, but dropped the first three games of the second set before rallying.
She broke Cornet at love in the final game to advance to Saturday's final where she will meet the winner of Friday night's other semifinal between top-seeded Anna Chakvetadze and Amelie Mauresmo.
Cornet, who also made it to the third round in Beijing, said she wore down midway through the second set.
"She was just ready to fight on every point, and I started to feel a little bit tired,'' Cornet said. "After, it was worse and worse and finally at the end of the match, the two last games, I was out of the match.''
Cornet had her left thigh wrapped after injuring her quadriceps in the quarterfinals, but said the injury is not serious and should not affect her chances next week in the U.S. Open.
Wozniacki, who beat third-seeded Marion Bartoli 6-4, 6-0 in the quarterfinals, has moved up from No. 64 in the world in January to No. 22 and expects to continue her climb.
"I would love to become No. 1 in the world and win Grand Slams,'' Wozniacki said. "I think everyone practicing this hard, you know, putting such an effort in it wants to become No. 1 in the world. But there's only one No. 1. So, you know, you need to put some hard work in it You know, I still have 21 spots to go. And hopefully after this tournament I have a little bit less.''
In the first men's semifinal, Fish dominated the first set and Verdasco did the same in the second. In the final set, Fish got the winning point on Verdasco's ninth double fault of the match.
"I feel like with my serve and my serve game, if I can get two breaks in a set, I'll feel pretty comfortable,'' Fish said.
Fish, who lost to his good friend James Blake a year ago, is looking for his third singles title, and first since 2006.
He will face the winner of Friday's late semifinal between Slovenian Luka Gregorc and Croatian Marin Cilic, a 19-year-old ranked 31st in the world.
Top-seed Verdasco advances at Pilot Pen
Penguins’ Brent to answer fan questions on Friday
