Travel disruptions in many areas of Europe are expected to ease today as temperatures rise above freezing in most places however, more snow is forecast in northern England, Scotland and eastern Germany later today.
The cold snap throughout the continent over the last few days left many passengers desperate to get home for Christmas facing long delays or flight cancellations.
Heathrow, Europe's busiest airport, is now open and runways are clear, with some disruptions, the airport said on its website.
Yesterday, a total of 51 flights to British and European destinations were cancelled.
Passengers using Glasgow Airport were warned to expect delays and cancellations, with similar situations at Edinburgh and Aberdeen.
Budget airline easyJet cancelled several dozen flights this morning, from airports including Gatwick, Stansted, Manchester and Luton. So far, 36 of the airline’s 1,000 scheduled flights have been cancelled today.
A message on its website said: “We sincerely apologise for the disruption...but due to the current weather conditions, we have had to cancel some of our flights.”
British Airways said the majority of its flights were operating normally. It said fog at Heathrow airport meant that it had had to cancel some short-haul flights but its Gatwick flights were operating normally.
Passengers were “strongly advised” to check their flight status before leaving for the airport.
Luton airport said today it was open, but warned some flights were subject to delay and cancellation.
Gatwick Airport also said it was open and the runway was operating as normal, but advised passengers again to contact their airline for the latest flight information.
Manchester Airport was fully operational today after anticipated heavy snowfall failed to materialise overnight.
Luton Airport said it had doubled the number of staff working at the terminal to cope with the surge in the number of passengers waiting for flights there.
Southampton Airport runway was closed this morning due to ice but the runway has now reopened. A spokeswoman said that one flight had been cancelled.
Frankfurt's airport said on its website that delays and cancellations are still possible today, even though conditions are returning to normal.
Berlin's airport reported that flights are arriving and leaving on time.
In Milan, delays are expected at Malpensa Airport, where it snowed throughout the night, SEA, the airport's operator, said. Flights are normal at Linate, the city's smaller airport said.
Paris's airports were back to normal, as temperature rose above freezing and are expected to stay there through the Christmas weekend.
Earlier this week, Charles de Gaulle and Orly airports had asked airlines to cancel up to a third of their short-haul flights.
In the US the Federal Aviation Authority reported only general arrival and departure delays at some airports.
Eurostar trains, which had been suspended over the weekend, resumed running between London, Brussels and Paris yesterday. The company said it is operating at two-thirds capacity today.
At least 100 people have died in the past week throughout continental Europe as temperature dropped over 30C below freezing in some places. Two women died and 47 other people were injured after a coach overturned on an icy road in Cornwall.
In Poland, 79 people have died with temperatures falling as low as minus 20 degrees. In Germany, the temperatures have fallen as low as minus 33 degrees and at least seven people lost their lives.
Two homeless people also died in France this week from the cold, Agence France-Presse reported.
Agencies