A snowstorm and icy conditions in Britain caused flight cancellations, major delays to trains and traffic jams, officials said.
British Airways said all its domestic and European flights out of Heathrow, Europe's biggest airport, departing after 7 p.m. (2 p.m. EST) were canceled.
Luton airport, north of London, also said it has suspended all flights until late Monday.
Gatwick, one of Britain's main airports that normally has around 50 flights taking off and landing every hour, closed its only runway for essential deicing work Monday afternoon, and reopened five hours later. The airport warned in a statement that flights continued to be disrupted.
London's subway system reported delays on most routes because of the weather conditions and at least two lines were part suspended. National rail and commuter train services were also delayed in some parts of the British capital, including the major London Bridge station.