Planes were grounded and three flights had to be diverted away from Gatwick Airport because of “IT issues” in the air traffic control tower.
Flights from Tampa, Antigua and Belfast are believed to have been affected by the problems on Thursday morning.
The Belfast flight was diverted to Luton airport.
The technical issue in the control tower, which has now been resolved, meant that flights were unable to take off or land at the West Sussex airport for some time.
EasyJet said one of its flights had been en route to Gatwick prior to the disruption and was diverted to London Luton Airport.
A Gatwick Airport spokesperson said the diversions were the result of “IT issues in the air traffic control tower this morning”.
They later added: “Earlier IT issues in the air traffic control tower this morning have been resolved and flights are arriving and departing as normal.
“Some flights may still experience delays however and passengers are advised to check their flight status with the airline.”
An easyJet spokesperson said: “Whilst this is out of our control, we apologise for the inconvenience caused by the diversion and delays and would like to thank passengers for their patience and co-operation.
“The safety and security of its passengers and crew is our highest priority.”
