The airport is said to be ready by 2023. Located about 30–40 kilometres (16–22 NM) south of Phnom Penh, it is expected to be fully operational by 2025, and will replace the existing Phnom Penh International Airport as the city’s main airport.
The airport will span over 2,600 hectares in Kandal Province. Once completed, it will be the ninth-largest airport in the world and designated as a 4F class airport.
There are no serious concerns in the process of construction of the new Phnom Penh International Airport, even though Cambodia is suffering from COVID-19.
Cambodia Airport Construction Company (CAIC) is a joint venture jointly established by OCIC and the Secretariat of State for Civil Aviation of Cambodia in 2018 under the guidance of Samdech Techo Hun Sen to build the new Phnom Penh Airport, which is 20 km away from Phnom Penh on a total area of 2600 hectares and the construction project has 3 stages.
The company claims that the construction work for the first phase will cost 1,500 million US dollars, not including the value of the land, which can receive 13 million tourists a year, and the second phase will be completed by 2030, which can receive 30 million tourists per year, and the third phase will be completed in 2050, can receive 50 million tourists per year.
According to en.wikipedia.org and khmertimeskh.com