More than 24 Indian Airlines flights were unable to take off till 10 am from the airport in New Delhi due to low visibility on the runway, airport sources said adding, only two flights of the air carrier could take off past midnight on Friday.
Several flights of private air carriers too were delayed and rescheduled, they said.
The thick fog began gathering in the wee hours of the day and had not cleared up till 10 a.m.. The foggy weather also resulted in late running of trains en route to Delhi.
As many as 18 trains have been delayed, a Northern Railway official said. The minimum temperature in the capital was recorded at 8 degrees celsius, which was normal.
The Met office has forecast that the minimum temperature will stay around 8 degrees celsius and that there will be fog in the morning.
An early morning shot of a Delhi railway station
Photograph: AFP/Getty Images