Airlive.net, a website run by aviation enthusiasts that collects and displays real-time flight data, said all incoming flights to Gatwick were being diverted to other United Kingdom airports, like Manchester and Birmingham, and as far away as Paris and Amsterdam.
The two drones were spotted near the runway on Wednesday, prompting the UK's second busiest airport to suspend all flights while authorities investigate the intrusion, according to The Guardian.
Chris Woodroofe, Gatwick's chief operating officer, told BBC radio that roughly 10,000 people had been affected by the shutdown.
There were multiple reports of drone sightings since the initial report of two drones at 9.03pm local time on Wednesday (Thursday 5.03am, Singapore time), Gatwick said in an earlier statement.
Any problem at Gatwick causes a ripple effect throughout Britain and continental Europe, particularly during a holiday period when air traffic control systems are under strain.
A police helicopter was hovering near the airfield on Thursday morning to monitor the situation.
Some flights are also being sent to Manchester.
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Gatwick Airport, also known as London Gatwick, is a major global airport near Crawley in West Sussex, southeast England, 29.5 miles south of central London.
The airport normally operates throughout the night but the number of flights is restricted because of noise limitations.
Those meeting someone from a flight have been advised to check the airport's live flight information on its website for up-to-date information.
"We apologise to any affected passengers for this inconvenience but the safety is our foremost priority".
"Captain confirmed there are reports of a drone in the area. still waiting".
Strong sales of small consumer drones have led to repeated warnings about a possible threat to scheduled flights.