Airport chiefs plan to open Edinburgh Airport to departing flights from tomorrow morning - so long as the severe weather starts to ease.
Bosses have now declared all flights out of the airport have finished for today.
Aer Lingus has confirmed that all flights in and out of Ireland after 3pm today are cancelled until Saturday. It is "unlikely" that there will be any flights tomorrow, the airport said.
Several Aer Lingus regional flights scheduled for tomorrow between Cork and the United Kingdom have already been cancelled. Heathrow Express is operating a reduced service every half hour between Paddington and Heathrow, while Heathrow Connect services are suspended for today.
American Airlines is allowing customers flying through London's Gatwick and Heathrow airports through March 4 to rebook through March 21 between the same city pair in the same cabin (or pay the difference).
"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".
Most of the United Kingdom remains under severe weather alerts, with two red, two yellow, and two amber covering most of Britain.
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British Airways said the "very poor" weather conditions will continue to affect some of its flights.
Jet 2 has tweeted, "We are now advising travel as normal, and would notify our customers should there be any updates".
Meanwhile, easyJet warned of disruption to many flights.
Other London airports, including Gatwick, have also seen dozens of flights cancelled. It is keeping flights for later in the week under regular review.
All Aer Lingus and Ryanair flights will be grounded this afternoon. Guests who were booked to travel Wednesday can rebook on the next available flight, free of charge.