From Luton Airport Parkway train to London St Pancras International, walk to King's Cross St. Pancras Underground Station, Tube to London Liverpool Street, then train to Chelmsford. 1 h 13 min £28. From Luton Airport bus to Stansted Airport, Coach Station (Stansted Aprt) then bus to Chelmsford City Centre, Bus Station (Chelm Bus Stn). 2 h 6 min £15. From London Luton Airport (LTN) drive to Chelmsford. 59 min £11. From London Luton Airport towncar to Chelmsford. 59 min £152.