Flights
At Belfast International Airport, external, inbound and outbound flights have been cancelled on Monday due to the weather.
Arrivals from destinations such as Bristol, Glasgow, Manchester and Liverpool have been cancelled.
And departures to Birmingham, Newcastle, Edinburgh, Bristol, Glasgow, Manchester and London Luton are not going ahead.
The airport said delays are expected as the day goes on.
At Belfast City Airport, external flights to and from Inverness and Amsterdam have been cancelled due to the weather conditions.
Both airports have advised passengers to check with the airline or the airport website for live updates.
The runway at the City of Derry Airport , externalis currently closed for snow and ice clearance.
Efforts made this morning has already been hampered by the weather conditions.
Flights to London and Glasgow are delayed, while flights to Liverpool and Birmingham have been cancelled.
A flight to Manchester has been diverted to Belfast International Airport.
The airport said flights to Edinburgh and London Heathrow will be updated in due course as the runway is cleared.