The airport officials said that the delay has been delayed due to the completion of construction and to allow time for trials and testing, a spokesman for Dubai Airports told the media.
On completion Dubai's second largest airport, it is expected to have a capacity to handle 26 million passengers a year. Al Maktoum airport opened in 2013 and can currently handle about 7 million passengers a year.
The Dubai government said that it had secured $3 billion in long-term financing for the expansion of its airports, which together is forecast to serve 146.3 million passengers by 2025.
Dubai Airports' Chief Executive Paul Griffiths told Reuters in January that budget carrier flydubai would move its operations from Dubai International to Al Maktoum International in Q3 of this year, while national carrier Emirates Airline is slated to move to the new airport in 2025.
This year, passenger traffic across Dubai's two international airports is expected to reach just over 90 million in 2017, the spokesman said.