Commuters woke to a thick blanket of fog on Monday morning (November 2) which immediately caused problems for travel.
"A considerable number" of flights out of London City Airport were suspended for two hours with passengers advised to contact their airlines for details. Other London airports were also hit with Heathrow “pre-cancelling” 10% of its flights after yesterday’s fog-bound day.
Meanwhile, river services were suspended with Thames Clippers and the Woolwich Ferry halting its services.
Thames Clippers said: "Due to fog all of our services are currently suspended, we're sorry for any inconvenience, we will operate as soon as it’s safe to do so."
Motorists have been advised to take care on the roads.
Highways England said: “Road users will need plenty of extra time to do their usual commute, especially as the fog is expected to lift very slowly during the morning.”
British Airways said the fog was affecting flights at Heathrow, Gatwick and London City Airports and advised passengers to check online for updates.
A spokeswoman for Heathrow airport said: “We’ve got extra passenger ambassadors in the terminals to provide assistance for those travelling today.
“Once again we would like to apologise for the disruption.”
The forecast suggests that the fog will be slow to clear although there is a promise of sun should the cloud clear. On Sunday, November 1, the highest ever November temperature of 22.4C was recorded in Wales.