BA, Air France cancel flights
Gatwick airport is currently closed until the runway is cleared of snow.
Passengers due to fly out of Gatwick today should check with their airlines before departing for the airport.
"We are working with our airlines and business partners to reopen the runway as soon as it is safe to do so. Delays and cancellations are likely," said a statement on Gatwick Airport's runway.
"We regret the disruption to our passengers' travel plans but the safety of aircraft and passengers is our top priority."
As a result, airlines are cancelling flights. British Airways has cancelled most of its flights before 14:30. Easyjet has cancelled all flights before 13:40, with a number also cancelled this afternoon.
London Heathrow airport remains open, but cancellations are possible.
"Our airfield team is working round the clock to keep both runways clear but the threat of further snow and ice at the airport remains. We are doing everything we can to support both passengers and airlines," says a statement on Heathrow's website.
London Stansted, London City, Glasgow, Edinburgh, Manchester and Aberdeen airports are currently not reporting delays due to the snow, but inbound flights from other areas may be affacted.
Flights from Southampton airport were temporarily suspended this morning, while snow was cleared from the runway, which means knock-on delays and cancellations for flights later today.
European airports Frankfurt and Amsterdam Schiphol have not reported severe delays, but Paris airports have been hit by both snow and industrial action.
"Due to an industrial dispute called by the Air Traffic Controllers in France, from Wednesday January 13 to Thursday 14, Air France is compelled to cancel a certain amount of its flights," said a statement Air France's website.
"Besides, on January 13, bad weather conditions forecasted in the morning are added to this disrupted situation.
"As a result, on January 13, Air France will operate: 100% of its long-haul flights departing from Paris-Charles de Gaulle and Paris-Orly; 75 % of its domestic and european flights from Paris-Charles de Gaulle; 50 % of its domestic and european flights from Paris-Orly."