New Delhi, Jan 07 (Agencies): Dense fog once again returned to disrupt air operations at the Indira Gandhi International airport here on Friday, leading to diversions of four domestic and international flights.

After dense fog enveloped the airport on Thursday night, three domestic and one international flight was diverted to Jaipur, Kolkata and Bangalore, an airport official said.

An Air India flight from Vadodra and Kingfisher flight from Jaipur were diverted to Jaipur around 12.15 am. A Jet Airways flight was diverted to Kolkata and Air India flight from Bangalore was sent back due to poor visibility at the airport.

The runway visibility dropped to 75 metres and hovered between 75 metres to 200 metres between 11.30 PM and 6.30 AM.     There were no cancellations or rescheduling of flights, the official said.