Gatwick Airport is approximately 28 miles south of center of London. There is a big range of bus and rail transport choices for passengers using London Gatwick Airport
Gatwick Airport to/from Central London and Paris France.
Gatwick Express Train
This is the quickest, most expensive and relax choice. The terminus in Central London at Victoria is also central and a best transit point to your accommodation. If relaxation and speed is everything then this is your option. If you generally would get a taxi from and to the airport, do yourself a favour, take the Gatwick Express to Victoria then get black London cab from there.
Southern trains run the same way as the Gatwick Express. They take approximately fifteen minutes more to Victoria as they are stopping trains. They get extremely crowded at peak times, but are much affordable than the Gatwick Express. Before you get to Victoria the train will break at Clapham Junction where you can change trains to Waterloo Station by County Hall on the different side of the River Thames to Big Ben.
Thameslink trains runs a different way into Central London. It is almost as quick and is significantly affordable than the Gatwick Express. It stops at different stations mostly in the City of London, the business region of London. One stop is St Pancras, a big cheap hotel area in itself and extremely handy if you are staying in the Bloomsbury hotel area and is also the terminus for the Eurostar trains London Gatwick to Paris.
Private Hire Taxi/Car
Unless you have mobility issues or a lot of luggage; a private hire car from Gatwick to Paris does not make much sense. The Gatwick Express train plus a cab at its terminus in London, Victoria is going to be much quicker, more relax and much less cost than a private taxi or car.
Hotel Transfer Minivan Shuttle
Although a general London airport transfer in many countries, minivan shuttles in the England are rare as they find it hard to compete with airport trains and buses. At Gatwick where is a minivan shuttle option for Gatwick to Paris but the number of people using it is little. The service manages to be the most costly option but providing the lowest frequencies and among the slowest transfers. You might find an excellent idea is to get the Gatwick Express train into London than cab to your hotel.