Harrow – South Harrow – Northolt – Yeading – Hayes – Harlington – Heathrow (Route SL9)
Harrow-on-the-Hill Station Bus Station - College Road - Junction Road - Bessborough Road - Lower Road - Northolt Road - South Harrow Station - Northolt Road - Northolt Park Station - Pett's Hill - Mandeville Road - Northolt Station - Mandeville Road - Church Road - Yeading - Yeading Lane - Coldharbour Lane - Station Road - Hayes & Harlington Station - Station Road - High Street - Harlington Corner - Bath Road - Nettleton Road - East Ramp - Tunnel Road East - Vehicle Tunnel - Inner Ring East - Heathrow Terminals 1, 2, 3 Station Bus Station
Note: Buses only stop at the points shown on the timetable, plus Northolt Park Station, Hayes town centre and Harlington village.

Heathrow – Harlington – Hayes – Yeading – Northolt – South Harrow – Harrow (Route SL9)
Heathrow Terminals 1, 2, 3 Station Bus Station - Inner Ring West - Vehicle Tunnel - Tunnel Road West - M4 slip road - Bath Road - Harlington Corner - High Street - Station Road - Hayes & Harlington Station - Station Road - Coldharbour Lane - Yeading Lane - Yeading - Church Road - Mandeville Road - Northolt Station - Mandeville Road - Pett's Hill - Northolt Park Station - Northolt Road - South Harrow Station - Northolt Road - Lower Road - Bessborough Road - Junction Road - College Road - Headstone Road - Kymberley Road - Harrow-on-the-Hill Station Bus Station
Note: Buses only stop at the points shown on the timetable, plus Harlington village, Hayes town centre and Northolt Park Station.

Branded Superloop, replaced RouteX140

BCE47103 Harrow © Samuel Letsu