There is no direct transfer link between Heathrow and Gatwick airport by bus. Although there are bus services that can transport you to central London, Croydon, Watford and other UK locations. Also an extensive local bus network provides transportation from Heathrow airport to many west London towns. Heathrow central bus station is located between Terminals 1, 2 and 3. The terminals are a few minutes walk away via underground walkways. The bus station is open 24 hours a day and the travel centre is open from 06:00 to 22:30.

Services that call at Heathrow Airport station:

Metrobus

Route X26 runs from Heathrow to Croydon, via Hatton Cross, Teddington, Kingston, New Malden, Worcester Park, Cheam, Sutton, Carshalton and Wallington Green. This service operates 7 days a week.
Metrobus routes & timetable

Green Line

Green Line runs a service from Heathrow to Harlow via Uxbridge, Rickmansworth, Watford, St Albans, Hatfield, HGC and Hertford. Start is located on terminal 5, bay 9.
Green Line routes & timetables