These included two British Airways arrivals - from Tampa and Antigua - which were diverted to Heathrow and an easyJet flight from Northern Ireland which was diverted to Luton Airport.
Flight tracking service FlightAware showed a number of planes circling above Gatwick Airport between 8 am and 10 am local time.
"Earlier IT issues in the Air Traffic Control tower this morning have been resolved and flights are arriving and departing the airport as normal," in an updated statement, Gatwick Airport officials said.
