Several incoming and outgoing flights were delayed for the fourth consecutive day on Sunday due to low visibility at the both the international and domestic airports here.
Airport sources said that as many as 25 flights were delayed to the dip in the visibility on Sunday.
However, there were no cancellations though a Kingfisher flight was diverted to Jaipur, they added.
The sources said the segregated use of both the runways at the Indira Gandhi International Airport started after 1700 hrs when the Runway Visual Range (RVR) reached 2600 metres.