Airport had witnessed the second longest duration of dense fog conditions in last eight years, which led to suspension of flight operations for about three hours on Sunday night.
A total of 463 flights were delayed, 52 diverted and 140 cancelled due to poor visibility due to dense fog, between 1 AM of Sunday night and 12 noon of today, airport officials said.
The heavy blanket of fog forced authorities to suspend flight movement at the IGI Airport for around three hours on Sunday night, leading to delay and diversion of around 150 domestic and international flights.
As operations remained suspended, it led to cascading effect on the schedule of other morning flights and finally a large number of flights had to cancelled, the officials said, adding even the airlines were clue less and where finding themselves to handle the situation.
A SpiceJet flight from Goa to Delhi, with 132 passengers and four crew on board, had to make an emergency landing at around 9.50 PM as it ran short on fuel.
"We were left with no option but to cancel the flights, as there were huge number of flights got delayed due to diversions after they were unable to land at Delhi in poor visibility," the airline official said.
Lounges at the airport were packed with passengers who complained that they were not given information about the flight status.
Long queues were seen at airline counters for collection of refunds for cancelled flights or to get a seat on any early flight.
People could be seen moving from one counter to another in search of information or tickets.
"I had to wait for about three hours before the airline decided to cancel my flight to Mumbai. Now I am waiting in the queue to get a refund," said Anil Kumar.
