LONDON — Snow and wintry weather are still wreaking havoc on travellers in Britain, with flights cancelled, roads sheathed in ice and rail travel disrupted.

With temperatures dropping overnight as low as -11.6C, Europe’s largest airport, Heathrow, warned that some flights would be cancelled as it cleared the backlog of flights delayed by Sunday’s snowfall. Hundreds of schools were also closed early Monday morning.

Heathrow asked travellers to check with their airlines. Air Canada issued a travel alert on its website, saying that flights may be impacted on Dec. 11 by forecasted snow, and that “Air Canada is monitoring the situation closely and is working to get you on your way safely and as quickly as possible.”

National Rail said poor weather conditions are affecting travel across England and Wales. Trains on Chiltern Railways, CrossCountry, Great Western, and Virgin Trains will also be affected.

With file from The Associated Press