I flew from Brussels aiport, a couple of months ago, after the explosions. Back then security had more layers and part of it was setup outside. I went 3 hours in advance (relating to flight time) to be sure I would get the airplane. Everything was relatively fluid, but with huge queues and different routing schemes for passengers things take more time.
How is it currently? Do I still need to account for the same amount of time? Are there better/worse periods along the day?
There are newspaper articles stating that the security measures have again relaxed, e.g. this one. Therefore, the queues should not be that big as they used to be. Actually, according to their own FAQ, the waiting time should never be more than 10 minutes. However, this sounds a little bit optimistic.
The best thing however is to get the real data. The Brussel Airport app provides security waiting times in real time. You could check these waiting times periodically the days before your flight to get a feeling.
I went very recently through Brussels Airport. It was a Saturday afternoon and therefore I am not sure how that influences the experience since there might be less people flying.
There is a new security check before entering the airport. It was quite easy and there was no queue at all.
Inside the airport the process is similar to what it was. At least from a user perspective. The queue was minimal and the staff helpful trying to make the process smooth.
I flew recently from Brussels airport and security is regularized with no significant delays.
