Further cancellations and delays are expected at Heathrow today – the sixth day of blizzard conditions.

Dozens of flights were cancelled yesterday from the London hub and there were delays at airports including Gatwick, Birmingham, Stansted and Luton. Gatwick planned to operate a full schedule of flights today.

The southwest of the country and south Wales was affected by more snow and ice overnight, although forecasters predicted a thaw towards the weekend as milder, wet and windy weather arrives.

Bristol airport was shut early this morning due to snow and freezing conditions. Flights were suspended until at least 7am.

The airport said: “Snow is affecting airport operations. Passengers are kindly advised to contact their airline to confirm the status of their flight before travelling to the Airport.

“Local roads have also been affected due to heavy snowfall, therefore customers are advised to drive with caution.”

Cardiff airport was closed yesterday but was due to reopen early this morning.

“Some flights are cancelled or operating with a delay due to the ongoing weather conditions throughout the UK and Europe,” the airport said.

“Passengers due to travel on Wednesday 23rd January are advised to check-in as normal and to allow additional journey time to the airport.”

EasyJet issued a warning that airports in the UK and across northern and central Europe may experience some disruption due to the current ice and snow conditions.

“Regrettably some flights are subject to delays and potential cancellations and as such we would encourage you to check the status of your flight  before heading to the airport,” the airline said.

”Please also allow extra time for your journey to and from the airport. Rail and coach services are also subject to disruption and we would advise that you check with your travel provider directly for specific information. Check in will close for all flights as normal.”