The restored facility was damaged by Iranian drones on Wednesday.
The pumping capacity of around seven million barrels of oil per day has been fully restored, Saudi Arabia's Ministry of Energy said in a statement.
However, work to restore war-damaged production facilities in the Khurais oil field is continuing, according to the ministry.
Saudi Arabia is one of the oil-producing countries around the Persian Gulf that has been attacked by Iran in response to the US and Israeli bombing attacks, which began on February 28.
