Low visibility was causing flight delays this morning at Heathrow, Gatwick, London City and Brussels airports, according to Eurocontrol.
Heathrow said there would be some delays and cancellations and advised passengers to check with their airlines before travelling.
More than 200 flights were cancelled at Heathrow yesterday, while other airports also experienced disruption.
Stansted was open and operating this morning but the airport said that wintry conditions were affecting many parts of UK and Europe. Passengers were advised to check their flight status with airline websites.
Leeds/Bradford airport was operating but passengers were warned that adverse weather was causing some disruption to flight schedules
Wintry weather, including snow, is forecast for Newcastle airport over the next few days.
“The weather has also affected other airports in the UK and Europe, causing delays and cancellations in some cases. We will work hard at Newcastle airport to minimise disruption for all passengers,” the airport said.
EasyJet highlighted the possibility of disruption at airports across northern and central Europe including Lyon, Toulouse, Milan (Malpensa and Linate), Munich, Berlin Schoenefeld, Innsbruck, Krakow, Geneva, Basel and Zurich.
Manchester airport said: “We have dedicated teams clearing the snow and are working hard to keep the airport open and get flights away.”
Eurostar cancelled two services from Paris to London and one train from Brussels to London this morning together with the 5.04pm departure from London St Pancras to Brussels and the 5.31pm to Paris.
Services were facing speed restrictions, extending journey times by between 60 and 90 minutes.
Eurostar said: “As a result of the continuing snow and ice in the UK, northern France and Belgium, we are having to operate speed restrictions and this is having an impact on journey times and the number of services that we can run.
“Under such conditions the threat posed by ice damage to our fleet is considerable and as a necessary safety precaution we cannot run at full speed.
“We appreciate that this is very frustrating for our passengers who are keen to get to their destination; however, the safety of our passengers and our fleet has to be our top priority.”