The flight from London to Paris takes about an hour and ten minutes, but nobody lives at the airport. Add the journey to Heathrow or Gatwick, the time before departure, and the trip from Charles de Gaulle into Paris, and you are looking at four to five hours door to door. Eurostar takes about two hours and twenty minutes from St Pancras to Gare du Nord, centre to centre, with no airport queues.
For most people travelling between central London and central Paris, the train wins on time and comfort, and it is often competitive on price if you book early. Flying makes sense when it is much cheaper, when you live near an airport rather than St Pancras, or when you are connecting to a long-haul flight.
