Cost and time trade-offs
By train, Thameslink and Southern are the value choice at about £13.70, and they beat the Gatwick Express because they run through more of London. Thameslink continues to London Bridge, Blackfriars, Farringdon, City Thameslink and St Pancras, so you often avoid a second Tube fare. The Gatwick Express only adds value if Victoria is exactly where you need to be and you want the simplest direct train.