From Syon Lane train to Windsor & Eton Riverside then walk to Windsor Castle. 33 min £8. From Boston Manor Underground Station Tube to Heathrow Airport Terminal 5, Heathrow Terminal 5, line 8 bus to Windsor Town Centre, WH Smith (Central Station Access Road), then walk to Windsor Castle. 1 h 28 min £7. From Brentford taxi to Windsor Castle. 23 min £67. From Brentford drive to Windsor Castle. 23 min £3.
Train from Brentford to Windsor Castle
South Western Railway operates a train from Brentford to Windsor Castle once daily. Tickets cost $8 - $13 and the journey takes 30 min.