However, some temporary buildings are still in use as the airport continues repairs.
The two attackers detonated suitcase bombs in the departure hall on March 22, before a third bomber blew himself up on a metro train in the city. In all, they killed 32 people.
From Monday, 111 check-in counters will be open in the airport departure hall and another 36 in a temporary buildings, according to the airport management company. This brings departure passenger capacity to at least 80% of that before the attacks, it said.
“The reopening is an important moment for the entire airport community and Belgium,” said Arnaud Feist, CEO of Brussels Airport Company.