The invitation, delivered by Kim's visiting sister Kim Yo Jong, said Kim was willing to meet the South's leader "at the earliest date possible", said a spokesman for the presidential Blue House.
An inter-Korean summit would be the third of its kind, after Kim's father and predecessor Kim Jong Il met the South's Kim Dae-jung and Roh Moo-hyun in 2000 and 2007 respectively, both of them in Pyongyang.
Washington insists that Pyongyang - which is under multiple sets of UN Security Council sanctions - must take concrete steps towards denuclearisation before any negotiations can happen.
After months of silence on whether it would even take part in the Pyeongchang Winter Olympics in the South, the Games have driven a rapprochement on the peninsula, while the North's athletes, performers and delegates have dominated the headlines.
"We hope to see you in Pyongyang at an early date," Kim Yo Jong told Moon after delivering a personal letter from her brother, according to officials.
"We want to see President Moon become a protagonist in opening a new chapter for reunification and leave great footprints in history," she said.
The two Koreas have been divided since the conflict ended in a ceasefire in 1953, and the democratic South has risen to become the world's 11th-largest economy, while the North has stagnated under the Kim family's rule.
Moon urged Pyongyang to actively seek an "absolutely necessary" dialogue with Washington, he said.
Tensions between the two soared last year as Pyongyang launched intercontinental ballistic missiles capable of reaching the US mainland and carried out by far its most powerful nuclear test to date.
Analysts believe the Olympic diplomatic drive by the North - which put its ICBMs on show at a military parade in Pyongyang on Thursday - seeks to loosen the sanctions against it and undermine the alliance between Seoul and Washington.
"Kim's proposal for a summit with Moon is based on the premise that the North will stick to its nuclear weapons while seeking rapprochement with the South," he told AFP. "The North is not interested in talks on denuclearisation.
The North Korean delegation then took the bullet train to Gangneung, the venue of all ice competitions, and attended a banquet hosted by the South's unification minister Cho Myong- gyon.
"Although it's my first time here, it doesn't feel strange. It's not unfamiliar," Kim said when asked by one of the South Koreans at the dinner how she feels on the other side of the border.
Moon shook hands with both Kim Yo Jong and Kim Yong Nam at the Olympics opening ceremony on Friday and they cheered as athletes from North and South entered the arena together behind a unification flag showing an undivided Korean peninsula.
But US Vice President Mike Pence, who was seated in the same box at the opening ceremony, did not interact with the North Koreans at any point, US officials said.
He did not shake hands with Kim Yong Nam while making a brief appearance at a leaders' reception ahead of the ceremony - although Japanese Prime Minister Shinzo Abe did so.
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