National Express runs buses from Heathrow Airport to Victoria Coach Station in Central London. This is currently the only bus departing the airport. The bus station is located above the Underground Station for Terminals 1, 2 and 3 which is about a 10 minute walk. From Terminal 4 you need to catch the free Heathrow Connect shuttle and from Terminal 5 you can take the Heathrow Express shuttle which is also free.
Buses depart frequently but the last bus is at around 9:30pm. Tickets can be booked in advance online and emailed for you to print at home. If your flight is delayed and you miss your scheduled bus, your ticket will be honoured on the other buses, but your seat will not be guaranteed.
Time: Between 45 and 70 minutes depending on traffic.
Cost: £4.00 one-way