The London Underground Piccadilly Line provides a regular service to all Terminals at Heathrow Airport.
There are two Underground stations serving Heathrow. The first (arriving from London) is for Terminal 4, the second, serves Terminals 1, 2 and 3.
The first train from central London leaves Cockfosters at 05:11 calling at all stations including King's Cross at 05:38, Piccadilly Circus at 05:45, Knightsbridge at 05:49 and arrives Heathrow Terminal 4 at around 06:30 and Terminals 1, 2 and 3 at 06:35.
The last train to Heathrow Terminal 4 arrives at 23:55 (11.55 pm). A later train to Terminals 1, 2 and 3 arrives at 01:08 (1.08 am).
Trains run every 3-7 minutes depending on time of day.
Average journey time is 45-60 minutes.
Fare from central London (Zone 1): One way £3.70 (child £1.50).
If your tube journey starts after 09:30 am a One Day Travelcard costs £5.10 and gives unlimited travel on London Transport tubes and buses.