The departure and arrival delays continued through the day at the airport.
Drass was recorded the coldest in Jammu and Kashmir, at minus 24.8 degrees Celsius. The maximum temperature in the town remained below the freezing point at minus 9.8.
According to the India Meteorological Department (IMD), the visibility dropped to zero metres for Palam between 6.30 a.m. and 7.30 a.m. while it was 200 metres for Safdarjung.
According to the Central Pollution Control Board (CPCB) data, the overall Air Quality Index (AQI) in the city reached 417, which is in the 'severe' category.
The Palam observatory recorded visibility at 50 metres at 8.30 am while at the Safdarjung observatory, it was recorded at 350 metres.
Fog, cold wave intensifies in several parts of Northern India.
Three international and one domestic flights were diverted due to poor visibility in dense fog at Delhi's IGI.
The minimum temperature in the national capital was recorded at 12 degree Celsius that was two notches below the average. The maximum temperature was likely to hover around 30 degrees Celsius.
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Visibility was extremely low from 6 am onwards at the airport in Dabolim, around 30km from here, said the Airports Authority of India (AAI). Airport authorities said two international flights were diverted to other cities.
The minimum temperature dipped to 6.4 degrees Celsius, three notches below the average for the season, said a MeT department official.
As per the Indian Meteorological Department, the maximum temperature will be 25 degree Celsius, with lows of five degrees.
Delhi has been witnessing chilly wintry mornings for the last couple of days, with cold waves intensifying in the region.
Dense fog prevailed at several places, affecting normal life. Road, rail and air traffic was affected due to the fog.