Journalist Bart Raes was onboard the SAS flight from Norway and said passengers were not told there was a bomb threat while in the air.
He said the flight landed and when it arrived at the gate the pilot informed passengers there was possibly a bomb on board.
They then had to remain seated for 10 minutes before they were allowed to alight.
The pilot had been told 20 minutes before landing about the bomb threat.
Other flights were diverted from the airport as well.
Zaventem was hit by two out of three coordinated suicide bombings in the Belgian capital in March this year.
Fifteen people were killed and 81 injured in the nail bomb attack in the airport’s check-in hall after the Islamic State (ISIS) jihadis blew themselves up.
A third suicide bomber was prevented from detonating his bomb by the force of the two previous explosions which were within seconds of each other.
Just over an hour later, another bomb went off on a Metro train pulling out of Maalbeek station in the centre of Brussels.
A total of 18 people were killed and 219 were injured.
The bombings were the deadlist act of terrorism in Belgium’s history.