London United operates a bus from Hounslow to Legoland Windsor every 5 minutes. Tickets cost $6 and the journey takes 53 min. Green Line (operated by First in Berkshire) also services this route every 30 minutes.
How to get from Hounslow to Legoland Windsor
From Twickenham train to Windsor Town Centre, Theatre Royal (River Street), bus to Legoland, Staff Entrance (Staff car park), then walk to Legoland Windsor. 51 min £11. From Hounslow, Treaty Centre line 81 bus to Slough Bus Station, line 702 bus to Legoland, Staff Entrance (Staff car park), then walk to Legoland Windsor. 1 h 41 min £7. From Hounslow taxi to Legoland Windsor. 21 min £70. From Hounslow drive to Legoland Windsor. 21 min £3.