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

https://rylanpzam955.timeforchangecounselling.com/how-to-get-to-gatwick-from-london-10-practical-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.