The Hammersmith and City lines did not call at Kings Cross St. Pancras.
Kings Cross/St Pancras
King's Cross St. Pancras is the London Underground (tube) station serving the two National Rail (mainline) termini, King's Cross and St Pancras. All three stations are separate but adjacent.
The Circle Line is the Tube Line that did not call at the Kings Cross.
Look at your Tube Map and travel to Kings Cross/St Pancras Station.
To travel from Heathrow to Kings Cross using the tube, you can take the Piccadilly line from Heathrow Airport to King's Cross St. Pancras station. The journey takes approximately 50 minutes.
King's Cross St. Pancras tube station was created in 1968.
From Waterloo take the Bakerloo line to Oxford Circus. There transfer to the Victoria line to St. Pancras International rail station. Journey takes about 20 minutes with one change of train. Check the 'London Tube' site for service delays and restrictions.
The Circle Line and Central Line run between these two stations.
Kings Cross and Charing Cross.
Yes - the Northern Line (Charing Cross Branch)
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No. You need to get a Piccadilly line tube from any of Heathrow's terminals to Green Park, then you need to change onto a Victoria line train to Kings Cross/St. Pancras. From King's Cross train station you can get an East Coast main line train to Durham.