About 40 domestic flights were cancelled while many others diverted with heavy rains bringing down the visibility at the city airport making flight operations difficult.
"More than 40 flights have been cancelled while another 10 have been diverted to some other destinations. All incoming flights have been diverted since noon," airport sources said.
Jet Airways has cancelled 25 flights on Tuesday while Air Deccan cancelled 15 incoming and outgoing flights from the Chhatrapati Shivaji International terminal in Mumbai.
"So far Jet Airways has cancelled around 25 flights. The planned remaining flights for today are 23 flights. We will club together flights and operate around 10-12 flights for the rest of the day," an airline spokesperson said, adding its Singapore flight will operate as normal later in the day. The London flight left with a minor delay.
Indian has not cancelled any flights, but there is a delay of 45 to one hour for all incoming and outgoing operations, the airline spokesperson said.
Meanwhile, Airport Director RJ Treasurywala said that the functioning of the airport was "more or less normal despite some delays".
"Obviously due to rains, there are delays, but there is no water logging on the runway. Flights can land and take off from this airport," he said.
When asked about the many cancellations, he said it was up to individual airlines and pilots to take a decision whether to land and and take off aircraft from the airport.