Following the attacks on March 22, the airport recorded a decrease of 29.1 percent in passenger traffic at the end of March, compared to 2015 figures.
Despite the partial resumption of activity in April, passenger traffic at the airport fell by 46.5 percent.
Before the attacks, the airport had recorded increased growth in passenger traffic of 7.5 percent in January, 11 percent in February, and 7.3 percent from March 1 to 21.
The overall balance of the airport is negative in the first four months of 2016: -16 percent compared to the same period in 2015.
Brussels Airlines, Belgian flagship airline based at Brussels Airport, has in turn recorded a decrease of 16.9 percent compared to April 2015.