Terminals 2 and 3:
Head to the central bus station, a short walk from the terminals. It’s open 24/7, and the travel centre is open from 06:00-22:30.
Find stops 13 ad 14 outside Arrivals.
Find stops 9-15 outside Arrivals.
Get tickets at Heathrow
Buy tickets for any coach service at Heathrow central bus station (Terminal 2 and 3), or at the National Express ticket office at international arrivals in Terminal 5.