North Korea's leader has called for a "further livening up" of the "warm climate of reconciliation" with the South created by the Winter Olympics.
Kim Jong-un, whose nuclear bomb and missile tests have stoked international tension, praised the South for hosting his state at the games in Pyeongchang.
The North's delegation, led by his sister Kim Yo-jong, has returned home.
South Korean President President Moon Jae-in has said the US is open to talking with the North.
He did not elaborate and may have been referring to a remark by US Vice-President Mike Pence on his flight back to Washington from the Games.
"If you want to talk, we'll talk," Mr Pence was quoted as saying by the Washington Post.
While the North's attendance at the Games has been seen as marking a major warming in relations, there have also been concerns that it has allowed it to win a propaganda victory.
expressed satisfaction over it," North Korean news agency KCNA reports.
It said Mr Kim had been impressed by "the features of the south side, which specially prioritized the visit of the members of the Democratic People's Republic of Korea… and expressed thanks for them". (Read More: BBC)