Świątek beat American Ann Li 6-4, 6-1 in the quarterfinals, while Chwalińska defeated Greece's Maria Sakkari 6-0, 3-6, 7-5.
Świątek and Chwalińska will face off on Saturday for a place in the final.
Świątek's victory over Li kept alive her hopes of qualifying for the season-ending eight-player WTA Finals, which will be held from November 8 to 15 in Indian Wells, California.
Chwalińska's win over Sakkari moved her to a career-high No. 16 in the live rankings, Poland's PAP news agency reported.
The 25-year-old had previously reached No. 21.
The Wuhan Open runs until Sunday.
(gs)
Source: IAR/PAP