President Jokowi in Singapore for son's graduation from ACS International

Indonesia's President Joko Widodo (C) stands with First Lady Iriana Widodo (4th L), son Gibran Rakabuming (5th L), daughter Kahiyang Ayu (L) and youngest son Kaesang Pangarep (2nd L).

JAKARTA - Indonesian President Joko "Jokowi" Widodo is scheduled to fly to Singapore in an economy-class flight on Friday to attend the graduation ceremony of his youngest son, Kaesang Pangarep.

"(The President) will attend the graduation of his son from 7pm to 9pm (on Friday). He will return to Jakarta at 10am on Saturday," Indonesian Embassy in Singapore spokesperson Sukmo Yuwono told The Jakarta Post on Friday.

Kaesang, 19, completed his international baccalaureate at ACS International Singapore.

On Thursday, Cabinet Secretary Andi Widjajanto said the President, along with a small entourage of Presidential Security Detail (Paspampres) officers, would fly from Soekarno-Hatta International Airport to Singapore's Changi Airport on a commercial flight.

According to Andi, Jokowi refused to use the official presidential aircraft because the purpose of his visit was personal.

"Pak Jokowi will travel as Joko Widodo, not as President," he told reporters.

Jokowi and First Lady Iriana have three children: sons Kaesang and Gibran Rakabuming Raka, 27, and daughter Kahiyang Ayu, 23.