If you are arriving to London by Eurostar, or going to Paris from London by Eurostar, St Pancras International station will be your arrival/departure point.
London St Pancras International is one of the most modern rail stations in the world. In addition to convenient connections by Eurostar, it features great dining and shopping options in case you arrive early and have a plenty of time before your scheduled departure.
London St Pancras Station by Underground
King's Cross St. Pancras Underground is reachable by 6 London tube lines: Circle, Hammersmith&City, Metropolitan, Northern, Piccadilly and Victoria lines. For more information about London Underground, please visit their website. There is free WiFi at the station.
London St Pancras Station to/from Heathrow Airport
It will take about 1 hour to get to London St Pancras Station from Heathrow (or from Heathrow airport to London St Pancras Station). Use Piccadilly line: King's Cross St. Pancras Underground for the rail station, and Heathrow Terminals 1-2-3 for the airport Underground station.
Alternatively, take Bakerloo line to Paddington, and then Heathrow Express to the airport. Learn more about Heathrow Express.
London St Pancras Station to/from Gatwick Airport
The fastest and easiest way is by Thameslink train, they connect Gatwick airport and come directly to St Pancras Station. For tickets, schedule and pricing, please check their website.
Eurostar route map
To see the options of where you can go to with Eurostar from London, please check their interactive map.