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

https://tirlewdyux.raindrop.page/bookmarks-74200851

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.