From Rickmansworth Underground Station Tube to King's Cross St. Pancras Underground Station then Tube to Covent Garden Underground Station. 50 min £5. From Rickmansworth, Springwell Avenue bus to Rickmansworth Underground Station, Tube to Baker Street Station, then line 139 bus to Covent Garden, Southampton St Covent Garden. 1 h 19 min £11. From Mill End taxi to Covent Garden. 37 min £112. From Mill End drive to Covent Garden. 37 min £5.