Flights to everywhere from Belfast and Tenerife to Kraków, Poland, and Accra, Ghana, have been delayed by as much as an hour and a half this morning. Live arrivals boards also show slight delays to incoming flights. According to the monitoring website FlightStats, the delays are ‘excessive and increasing’.

Fog is continuing to disrupt flights at Gatwick Airport with restrictions imposed to maintain safety. On what is expected to be the airport's busiest day of the Christmas period, it said some flights "may be delayed throughout the day" due to "poor visibility" and apologised to customers.

Gatwick Airport has said operations are "returning to normal" after four days of fog-related flight restrictions. Temporary air traffic restrictions that were in place over the weekend have been lifted after the weather improved.

Tens of thousands of passengers have had their Christmas travel disrupted in recent days as thick fog has descended on airports.

Gatwick Airport has been hit by a fourth day of flight restrictions due to fog, causing disruption for thousands of passengers. More than 20 flights scheduled for Monday (December 30) at the airport were cancelled in advance, with warnings of further delays throughout the day.

Gatwick Airport ‘returning to normal’ after fog disruption - More than 20 flights planned for the West Sussex airport on Monday were cancelled in advance.

Flight restrictions remain in place at Gatwick Airport for a fourth day because of fog, disrupting travel plans for thousands of passengers.

More than 20 flights planned for the West Sussex airport on Monday were cancelled in advance and passengers are being warned of delays throughout the day.