"Dublin Airport was operational from 5.20 this morning following snow and ice clearance and its runway remained open throughout the day, apart from a short period for de-icing in the mid-afternoon".
Other London airports, including Gatwick, have also seen dozens of flights cancelled.
Two BA flights between Newcastle and Heathrow were cancelled yesterday in anticipation of bad weather.
On the budget side of things, Ryanair is facing disruption on both sides of the Irish Sea, with a number of airports being completely cancelled by the airline for the day.
Ryanair have cancelled a large number of flights to and from Italy due to the bad weather, but now all Irish flights are operating as normal.
Ryanair, meanwhile, have cancelled all flights to/from Dublin, Cork, Kerry, Knock & Shannon Airports today and tomorrow (Friday).
Passengers are being advised to check with their airlines for the latest updates before heading to the airport.
"We strongly advise all passengers due to travel today continue to check their flight status by using Flight Tracker and avoid travelling to the airport if your flight is cancelled".
Please be assured that we will be doing our best to ensure that flights will operate as normal, taking into consideration any adverse weather conditions.
The red alert - from Ireland's weather service - warns of persistent blizzards this evening, coupled with sub-zero temperatures and a fresh dump of snow.
"Disruption to your train journey may continue today and tomorrow".
There is no public transport operating between the airport and Cork City and taxis are in low supply.
All schools and colleges have also closed and the country is now largely cut off from air travel as Storm Emma blows in from the Atlantic.
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