From near Uxbridge Underground Station:
Buses U3 or U4 go to Brunel's Uxbridge campus every 15 minutes from near Uxbridge Underground Station.

From West Drayton rail station:
Bus U3 goes from near West Drayton station every 15 minutes to Brunel. Bus 222 goes from near West Drayton station to Station Road (a 10 minute walk from Brunel) every 20 minutes.

From Heathrow:
The A10 'Heathrow Fast' bus service runs every 15 minutes from Heathrow to Uxbridge, stopping on Hillingdon Hill at the end of Kingston Lane and The Greenway. Journey time is approxiamtely 15 minutes. From there get a bus to Brunel.