Dubai International Airport's (DXB) Southern Runway will close for 45 days between 16 April and 30 May 2019, which will impact a significant number of scheduled Emirates flights. Given the limitations, there will be a 25% reduction in the overall number of flights operated by the airline during those 45 days.
However, in order to reduce the impact on passengers, the airline has announced network updates to its operational schedules in April and May.
Here’s a link to the list of change in schedules and operations of the airline across the year, including changes during the 45 days the runway is closed for 45 days.