EasyJet primarily operates out of the North Terminal at London Gatwick Airport for most of its flights, including domestic and international routes. However, EasyJet also uses the South Terminal for certain flights with flight numbers between 6300 and 6599 inclusive, which depart from or arrive at the South Terminal. It is always advisable to double-check your flight confirmation or Gatwick Airport's official flight information to confirm the terminal for your specific flight.