Aer Lingus has cancelled some of its flights from Dublin Airport to London's Heathrow due to 'freezing fog conditions' across the pond.
The airline warned passengers to expect delays on non-cancelled flights as well and further cancellations of other UK regional services.
It follows two days of extensive delays, with one group of passengers waiting almost 15 hours to board a flight to Barcelona.
Aer Lingus has advised passengers to check the status of their flight before travelling to the airport.
"We continue to monitor the weather conditions and wish to reassure customers that our teams are doing all they can to minimise any disruption to their travel plans", the airline company said.
"Customers travelling today can check the status of their flight on aerlingus.com before travelling to the airport."
Met Éireann has warned that the weather will remain very cold until the end of next week.
The national forecaster's winter Weather Advisory has been extended until next Friday, December 16th.
It said it will remain very cold into the middle of the week due to an Artic airmass bringing “widespread sharp to severe frosts and icy stretches”.
Freezing fog will occur at times, with winds remaining light over land.
Meanwhile, showers of hail, sleet, and snow will occur, mainly in coastal counties, such as Donegal and Mayo, and freezing fog is likely at times.
Light snow has been falling across the country, leading to hazardous conditions on Irish roads.
The cold snap also impacted on public transport, with many passengers facing cancelled or delayed trains.
Main image shows an Aer Lingus plane at Dublin Airport. Picture by: Sam Boal / RollingNews.ie