The king was also set to visit the northern region of Hail, in his first such tour since he ascended to the most powerful throne in the Middle East in 2015, the pro-government Sabq newspaper reported.
In Qassim, the king would launch health, education and infrastructure projects as well as check on “the conditions of citizens and get acquainted with their needs”, Saudi Gazette newspaper said.
The tour comes as Saudi Arabia faces growing international outrage over Khashoggi’s murder on October 2 in its consulate in Istanbul.
After first insisting Khashoggi left the consulate unharmed, Saudi authorities said he was killed in an argument that degenerated into a brawl before finally accepting what Turkey had said virtually from the start — that he was killed in a premeditated hit.
It is widely seen as the worst diplomatic crisis facing the kingdom since the September 11, 2001 terrorist attacks on the United States.
The murder has tainted the global image of Crown Prince Mohammed bin Salman — the king’s 33-year-old son and heir apparent — even though the kingdom strongly denies he was involved.
Saudi rulers appear to be shoring up support domestically, including within the royal family, following the crisis.
King Salman last month ordered the resumption of annual bonus payments to all government workers from the beginning of next year. The bonuses had been suspended under austerity measures in 2016 amid low oil prices.
In recent weeks, Saudi nationalists have sought to rally around the prince with adulatory poems and songs on social media as local officials dismiss the Khashoggi crisis as a Western conspiracy.