Transferring between terminals at Gatwick is very easy. The inter-terminal transit shuttle service operates 24 hours a day between North and South terminals and takes just two minutes.
Arriving and departing by Gatwick Express.
The train station where Gatwick Express arrives and departs is in the South Terminal. Simply follow signs for North Terminal when you arrive. Alternatively, if you’ve arrived at North Terminal and are travelling onwards by train, just follow signs to South Terminal.