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.

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

Disruption caused by thick fog is expected to continue at London's Gatwick Airport on Sunday – its busiest day of the Christmas holidays. Nats, the UK’s main air traffic control provider, said temporary air restrictions will continue on Sunday because of low visibility in airports affected by fog.

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.

Poor weather is disrupting services at Gatwick Airport with a number of easyJet flights "now unable to operate as planned", the airline has said with delays in place this evening

It follows two days of disruption at the UK’s busiest airports, with Saturday’s flights at Stansted Airport affected by the murky conditions, while live departure boards showed delays at Heathrow, Luton, Gatwick and Manchester Airports.

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.