An AirAsia plane with 162 people aboard lost contact with ground control soon after takeoff from Indonesia on Sunday morning.
Search and rescue operations are underway.
The Singapore aviation authority said it was informed about the missing plane by Jakarta ground control about half an hour after the contact was lost.
Singapore's airforce have now also joined the search
The Malaysia-based carried said in a statement on their Facebook page that the pilot of the flight requested "deviation" from its flight plan, because of bad weather.
There are 7 crew members on board, 138 adults, 16 children and a baby