All flights in and out of Northern Ireland’s three airports have been cancelled until 0100 BST due to the return of the volcanic ash cloud.
The Irish Aviation Authority has closed airports in Sligo, Donegal and Knock.
Flights to and from Dublin Airport will be grounded from 1900 BST on Sunday until 0900 BST on Monday.
Passengers who are due to travel on Sunday have been advised to check with their airline or tour operator before travelling to the airport.
The UK no-fly zones are set out by the Civil Aviation Authority using Met Office data.
Forecasts suggest the ash cloud could extend further over the UK during Monday and Tuesday.
The cloud is expected to lie over the London area by Tuesday, but is likely to have drifted out of UK airspace by Wednesday, forecasters say.
Prof Brian Golding, head of forecasting research at the Met Office, said the cloud stemmed from an eruption on Thursday.
"The volcano has now dropped back in height. It did that yesterday, so the ash coming towards us for the future isn’t quite so deep as it was on Thursday.
"It isn’t going to turn into a huge area and it’s being blown eastwards, between south-east and east. "
Ash from the Eyjafjallajokull volcano has caused disruption to thousands of flights since April.
The Department of Transport, which is establishing five-day ash prediction charts, is warning there is a chance airports in south-east England may be also be affected in the next few days.
Transport Secretary Philip Hammond said the situation was "fluid" but passenger safety was the top priority.
The air traffic authority Nats’ Jonathan Astill said: "Unfortunately, yet again, a mixture of volcanic activity and weather systems have conspired to bring a cloud of ash down towards the UK."
In April, airspace across Europe was shut down for five days over concerns ash could turn to molten glass in high temperatures, crippling plane engines.
Scientists and engineers have since revised the safe-to-fly threshold, but clouds of volcanic ash have continued to drift over Europe, causing airport closures, flight delays and cancellations.
In the past week, several airports in southern Europe have been forced to close and flights have been re-routed.
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