Top seeded Saina beat the fourth seed German 21-19, 21-8 in just 36 minutes at the Stade Pierre De Coubertin.
In Sunday's final, Saina will face Japanese Minatsu Mitani, who won 21-19, 21-18 against her compatriot Eriko Hirose.
Saina Nehwal overcame stiff opposition in the first game from sixth-seeded Juliane Schenk in the semifinal encounter that went on for 36 minutes.
This is the second straight defeat for Schenk against Saina after her loss in the Denmark Super Series final last week.
In the beginning, Saina conceded a 0-3 lead but later recovered to reduce the gap to 3-4. Later, Schenk surged to a 15-10 lead with the help of strong smashes and drops.
Saina levelled the score 16-all and Schenk complained about the speed of the shuttle. The tournament director came to check the shuttles.
Saina then took five straight points to wrap up the game.
In the second game Saina ran up an imposing 8-0 lead in double quick time. After her defeat, Schenk acknowledged Saina's victory with a smile.
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