N Korean leader's jet on way to Singapore

North Korean leader Kim Jong Un has landed in Singapore ahead of his summit with Donald Trump

North Korean leader Kim Jong Un's private jet has left Pyongyang for Singapore, South Korea's Yonhap News Agency says.

A different cargo plane which accompanied Kim Jong Un on his recent visit to China also departed Pyongyang and was likely headed for Singapore on Sunday, ahead of Kim's summit with US President Donald Trump on Tuesday.

Kim is due to meet Singapore Prime Minister Lee Hsien Loong in the city-state later on Sunday, Singapore's ministry of foreign affairs said in a statement.

Trump is expected to arrive at 8pm local time (2200 AEST) and go straight to his hotel, the Shangri-La, the White House said.

Authorities have beefed up security around the hotels where Trump and Kim (Saint Regis) will be staying in central Singapore.