World number one Sabalenka, from Belarus, defeated American Jessica Pegula, ranked third, after winning in straight sets on Friday night.
"I desperately wanted to win. I wanted it so badly," the finalist said after the semifinal, according to AFP.
Kazakh Jelena Rybakina secured her place in the final with a 2-1 win over American Coco Gauff in the second semifinal of the night in the women's draw.
The final takes place on Saturday evening, Swedish time.
Sabalenka, 28, has won the last two US Open titles but has had a tough year. Her opponent, Rybakina, 27, has been plagued by injury but has made it through the tournament without major problems.
