The Met department said the condition is likely to remain the same during the weekend.
Officials said runway visibility is likely to dip below 200m at 1.30am on Saturday but flights can land and take off from Runway 28 that can handle flight operations under CAT III conditions, when the visibility is above 50m.
Trains affected Fog severely affected train operations as Northern Railway cancelled several trains. While 25 trains were running late on Friday, 19 were cancelled and another 26 were rescheduled.
Northern Railway decided to cancel several passenger trains from January 4 to February 17
“In case there is no fog, cancelled trains may be restored,” a spokesperson said.