Exodus begins as airport reopens
Airlines are trying to shift tens of thousands of travellers desperate to get home for Christmas after Dublin Airport reopened.
About 40,000 passengers were left stranded on Thursday when heavy show showers grounded all flights for most of the day.
Siobhan Moore, spokeswoman for Dublin Airport, said about 800 people slept in the airport overnight to try and rebook on an early flight.
Despite the backlog, Ryanair and Aer Lingus said only passengers with confirmed reservations for travel on Friday can be accommodated on flights.
Irish Ferries will instead operate an extra sailing from Dublin to Holyhead, at 2.30pm, and another back to Dublin at 5.15pm. The vessel has capacity for 750 passengers and 200 cars.
Unexpected snow fell at Dublin Airport throughout Thursday, finally closing the airport at 6pm for the night while temperatures dropped to minus 10 degrees.
Ms Moore said: "Approximately 120,000 tons of snow was cleared from the airfield overnight. While no significant snowfalls are forecasted today our snow and ice crew are on standby should weather conditions deteriorate."
All other Irish airports, ferry services, train and bus services are operating, some with delays.
Meanwhile AA Roadwatch warned road conditions were treacherous, especially around the capital and along commuter routes.
Lowest temperatures will plummet to minus 15 on Friday evening.