There are 2 train routes to Cambridge from London - they depart from Kings Cross or Liverpool Street main line stations. From Kings Cross there are approx. 3 direct trains per hour, taking between 45 minutes and one hour to get to Cambridge. From Liverpool Street, there are approx. 2 direct trains per hour, taking around 1 hour 15 minutes.
Trains leave approx.
Journey time is about 10 minutes. OR Take the London Underground Piccadilly Line direct from Heathrow to Kings Cross. If you wish to catch a train which departs from Liverpool Street, change at Holborn and take a Central Line eastbound train to Liverpool Street. Trains leave approx. At Victoria Station, change to the London Underground Victoria Line northbound to Kings Cross, or take the Circle Line eastbound to Liverpool Street.