The expanded programme also feature new ports of call at Manama, Bahrain; Rarotonga, Cook Islands; Sokhna, Egypt; and Akita, Japan.
With this new season of itineraries from October 2024 through December 2025, NCL is also expanding its voyages to Antarctica, South America, Africa, Asia, Middle East, Australia and New Zealand by 37%.
"Our guests are craving longer, more immersive and unique itineraries that take them off the beaten path," said Harry Sommer, president and chief executive of NCL.
"These new sailings represent the most diverse itinerary programme to date and feature many brand firsts, including an extended Asia offering and new ports in Argentina, Bahrain, Japan and Egypt."
Together, Norwegian Sun and Norwegian Sky will debut in Asia, offering an eight-month season from October 2024 through May 2025, sailing voyages in the Philippines, Indonesia, Malaysia and Japan.
Both ships will be joined in the region by Norwegian Spirit, which will embark on a new repositioning voyage from Australia to Asia on 7 December 2024, followed by its first voyage in Asia on 21 December 2024.