The 25-year-old Pole will face Kazakhstan's Elena Rybakina in the championship match, her first final of the year.
Earlier in the tournament, Świątek defeated Sara Bejlek of the Czech Republic, Viktorija Golubic of Switzerland, Marta Kostyuk of Ukraine and Russian player Diana Shnaider.
The Canadian Open is a combined women's and men's hard-court tournament held annually in Toronto and Montreal.
In the men's tournament, Poland's Hubert Hurkacz was eliminated in the third round by Botic van de Zandschulp of the Netherlands.
Świątek, a former world No. 1, was eliminated in the third round of Wimbledon last month by Alexandra Eala of the Philippines, failing to defend her title in London.
The Polish player won her last tournament in September, when she defeated Russian Ekaterina Alexandrova in the Korea Open final in Seoul to capture the 25th title of her career.
(gs)
Source: IAR/PAP