From London City Airport
Take the DLR to Bank, then the Underground (Northern Line) to King's Cross St Pancras. Or take the DLR to West Ham, then the Underground (Hammersmith & City) to King's Cross St Pancras.
From Heathrow airport
Take the Heathrow Express (15 mins travelling time) or the Underground (Elizabeth Line, 30 mins travelling time) to Paddington, then the Underground (Circle or Hammersmith & City Line) to King's Cross St Pancras. Or take the Underground (Piccadilly Line) to King's Cross St Pancras (1 hour travelling time).
From Gatwick airport
Take a national rail train to St Pancras International. Or take the Gatwick Express, 30 mins to Victoria Station, then the Underground (Victoria Line) to King's Cross St Pancras.
From Stansted airport
Take the Stansted Express to Tottenham Hale station, and then the Underground (Victoria Line) to King's Cross St Pancras. Or take the Stanstead Express to Liverpool Street station, then the Underground (Circle Line) to King's Cross St Pancras.
From Luton airport
Take the Luton Airport Shuttle to Luton Airport Parkway station, then the Thameslink train to St Pancras International.