For a simple airport transfer, use National Express coaches from Victoria Coach Station to Gatwick

https://caidentvtk424.raidersfanteamshop.com/gatwick-airport-travel-times-what-to-expect-from-different-routes

For a simple airport transfer, use National Express coaches from Victoria Coach Station to Gatwick. They’re reliable, have luggage space, and can be cheaper than trains at off-peak times.