Kim Jong-un is set to become the first North Korean leader to cross into South Korean territory since the end of the Korean War in 1953, as final details are put in place for the summit.
South Korea said President Moon Jae-in would personally meet Kim at the border at 09:30 (00:30 GMT) tomorrow (Apr. 27).
The historic summit will focus on the North's recent indications it could be willing to give up its nuclear weapons.
Talks are also proposed between Kim and US President Trump by early June.
Kim is set to cross the military demarcation line - a clearly defined marker of the official land border between the territories. He will, however, remain within the Demilitarised Zone.
Seoul has warned reaching an agreement aimed at ridding Pyongyang of its nuclear weapons will be "difficult", because North Korea's nuclear and missile technology has advanced so much since the sides' leaders last met more than a decade ago.
"The difficult part is at what level the two leaders will be able to reach an agreement regarding willingness to denuclearize," South Korean presidential spokesperson Im Jong-seok said.