The court also banned Fawzia al-Ayuni and Wajiha al-Huaider from leaving the kingdom for two years, rights activist Aql al-Bahli said.
They have a month to appeal against the judgement.
The two women were convicted of the Islamic sharia law offence of takhbib, or incitement of a wife to defy the authority of her husband, Bahli said.
They had been briefly detained by police a year and a half ago in the company of the Canadian woman who at the time wanted to flee the kingdom with her children after a row with her husband, he added.
It urged the Canadian government to intervene with the Saudi authorities on the women's behalf.