South Western Railway operates a train from Slough to Hounslow hourly. Tickets cost $7 - $12 and the journey takes 28 min. Alternatively, London United operates a bus from Slough to Hounslow every 5 minutes. Tickets cost $6 and the journey takes 52 min.
From Windsor & Eton Riverside train to Twickenham. 28 min £7. From Slough train to Hayes Town, Hayes & Harlington then bus to Hounslow, Treaty Centre. 43 min £5. From Slough Town Centre, Queensmere Centre (Queensmere Shopping Ctr) line 81 bus to Hounslow, St Michael & St Martin Church. 52 min £3. From Slough taxi to Hounslow. 18 min £53. From Slough drive to Hounslow. 18 min £2. From Slough rideshare to Brentford. 37 min £4. From Slough walk to Hounslow. 3 h 39 min.