From the M25 at Junction 15 get onto the M4 eastbound one junction, leaving at Junction 4, then follow signs to the terminal. Or you can take the A4 following signs for the terminal. Terminal 4 Take the M4 to Junction 3, turn off and follow the signs to Terminal 4. From the M25 get off at Junction 14,and follow the Southern Perimeter Road along to Terminal 4. Short and long term parking is available.
Car hire is available from the airport.
The journey takes about 50 minutes from the centre of London. Train Reading Railair runs from Reading Station to Heathrow every 30 minutes, it takes about 45 minutes to get to the airport. The Heathrow Express runs straight from London Paddington to all the Terminals, it takes about 20 minutes, and runs every 15 minutes, every day. Click here , for the Railtrack timetable. Most of the coaches and bus services terminate in the central bus station, which is clearly signposted from all of the terminals.