The increase in net profit was because of growth in broadband and business sector services as well as higher revenue from international operations, Saudi Telecom said on Saturday.
The former monopoly made a net profit of 1.95 billion riyals ($520 million) in the three months to Sept. 30, compared with a forecast for 2.42 billion in a Reuters poll.
Operating income rose 0.5 percent to 3.02 billion riyals and revenue from services increased 8 percent to 15.1 billion.
It will pay a dividend of 0.50 riyal per share, totaling 1 billion riyals, out of third-quarter profit.
Soaring demand for broadband has lifted earnings in recent quarters, with STC offering bundle packages to woo customers back from rival operators Etihad Etisalat (Mobily) - an affiliate of UAE operator Etisalat, and Zain Saudi- part-owned by Kuwaiti group Zain.
STC, which remains majority government-owned company nearly a decade after bring listed, is the largest Gulf telecom operator by market value, with operations across the Muslim world from Indonesia to Turkey.