If you’re new to London, follow “Trains to Gatwick Airport” signs at Victoria, London Bridge, or St Pancras

https://edwinhxtn094.cavandoragh.org/gatwick-airport-by-car-best-routes-traffic-tips-and-costs-1

If you’re new to London, follow “Trains to Gatwick Airport” signs at Victoria, London Bridge, or St Pancras. Ticket machines and staff can assist with route and fares.