If coming from the south, many coastal towns have direct trains to Gatwick

https://caidentvtk424.raidersfanteamshop.com/gatwick-airport-journey-planner-tools-and-tips-to-pick-the-right-route-2

If coming from the south, many coastal towns have direct trains to Gatwick. Check Southern and Thameslink routes from places like Worthing, Lewes, and Eastbourne.