A number of flights were diverted due to zero visibility.
An official of flight operations of the airport, wishing anonymity, said a flight of Biman Bangladesh Airlines, which was scheduled to fly for Hong Kong around 3:30am, postponed its scheduled due to thick fog.
Later, the flight took off around 8:26am when fog lifted.
Replying to a question, he said it needs minimum 400 meters visibility for a smooth operation of landing and takeoff operation.
Deputy Director of the airport Benny Madhav Biswas told UNB that several international flights were diverted while some domestic and international flights were delayed due to poor visibility from 3:30am.
The flight operations become normal after 8:20am, he added.
Thick fog often disrupts operations at the country’s airports during winter.
Also read: Flight operations resume at Dhaka airport