To reach Gatwick on a budget, take Thameslink from St Pancras, Farringdon, or London Bridge

https://cruzbmfb309.trexgame.net/driving-to-gatwick-airport-directions-drop-off-and-parking

To reach Gatwick on a budget, take Thameslink from St Pancras, Farringdon, or London Bridge. Trains are frequent, accept contactless and Oyster, and often cost less than express services.