Travellers using London-area airports are being warned of a third day of fog-bound flight delays and cancellations.

Heathrow issued an alert warning of heavy fog today following disruption to flights over the weekend.

Gatwick and London City airport were also affected on Saturday and Sunday.

About 30 flights had been cancelled by airlines at Heathrow due to reduced runway capacity while 23 were grounded at Gatwick on Sunday due to the knock-on effect of problems caused by fog on Saturday.

Further disruption is expected today, with Heathrow urging travellers to check the status of their flights before raveling to the airport.

“Following heavy fog this weekend across England and Europe, there continues to be delays and cancellations to scheduled flights,” a statement said.

“If your flight is cancelled, we kindly ask that you do not come to the airport. We recommend that you use your airline’s website to rebook your flight instead.

“The safety of our passengers is our priority and we are sorry for the disruption to your journey.”

British Airways said: “Fog across parts of southern England affected some flights to and from London’s airports on Sunday.

“It is also expected that poor visibility could affect some flights on Monday and customers are advised to check the status of their flight.”