The Piccadilly Line serves all terminals.
The Piccadilly Line
Heathrow Tube line Piccadilly goes to Heathrow terminal 1, 2, 3, 4, 5
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.
Take the Piccadilly Line underground (tube) train or a taxi.
Take the tube from Heathrow to Acton Town then change onto a Piccadilly line train towards Uxbridge.
Take the Piccadilly underground (tube) line directly to St Pancras from all terminals at Heathrow.
By road, use the M4, the M25 and the M1. By flying, catch a flight to East Midlands Airport and catch a bus to Leicester. The best way is to travel on the tube from the appropriate Heathrow Terminal sttion on the Piccadilly line then change at Kings Cross for St Pancras station which serves Leicester.
The easiest way to get to Paddington from Heathrow is using the train - it's an express one & take 15 mins. I think it costs about 15 pounds. You can get there by tube but it'll take you a lot longer (maybe just over an hour). Take the Piccadilly line to Piccadilly Circus & then change to the Bakerloo line. Take the Bakerloo north to Paddington. The tube will cost around 6 pounds.
Take the Piccadilly line tube train from either Heathrow Terminals 1, 2, 3, Heathrow Terminal 4 or Heathrow Terminal 5 to King's Cross. There are however quite a numerous amount of stops in-between.
Two ways 1. Piccadilly Line Jubille line south bound from Bond Street to Green Park Change to Piccadilly line for Heathrow Terminal 4 2. Heathrow Express Bond Street to Oxford Circus on central line or walk. Oxford Street change to Bakerloo line northbound. Change at Paddington for Heathrow Express train.
Easy! The Piccadilly Line. Hounslow East, Hounslow Central, Hounslow West, Hatton Cross, Heathrow T1,2,3 & Heathrow T5. If you add Heathrow T4 into the equation as well (although it's on a loop, it's still part of the line!) there are actually 7...
To travel from London Heathrow Airport (LHR) to King's Cross using the tube, take the Piccadilly Line from Heathrow to King's Cross St. Pancras station. The journey takes about 50-60 minutes.