Passengers are advised to check with their airline and not to travel to the airport if their flight is cancelled.
HEAVY SNOW falls across UK - See the latest pictures.
The snowstorm - labelled "the beast from the east" due to its Siberian origins - has shut down several United Kingdom airports and grounded hundreds of flights.
In London, Heathrow Airport says that it is working with airlines to consolidate flight schedules in order to provide more certainty regarding departing flights.
It comes as passengers were forced to stay overnight in airports as they waited for news on their flights.
Manchester Airport is also reporting a number of flight cancellations and delays.
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And in Nutley, a supposed threat made against a school last week resulted in a student being banned from the school. The threat targeted a school in New Mexico, schools spokesman Stan Simpson said, and an arrest has been made.
"We would advise passengers not to travel to the airport and anyone with travel plans should contact their airline directly for specific flight information".
"If flying, please allow extra time for your journey". As a result, it has introduced more flexible rebooking options for customers on shot-haul flights to or from London Heathrow and London Gatwick airports.
"We are also seeing many cancelled flights across other airports including Bristol and Geneva", it said. The weather in Scotland has been particularly harsh by United Kingdom standards. Customers who are scheduled to travel through those airports through Friday can rebook through March 21, subject to availability.
De-icing of aircraft and snow clearing is now taking place and the airport says additional staff are on site to assist.
Meanwhile, Dublin Bus says its operating a limited service and has warned passengers they face significant disruption.
The full list of flight cancellations can be found on the Aer Lingus website.