West Midlands operates a train from Watford to St Albans hourly. Tickets cost $2 - $4 and the journey takes 15 min. Alternatively, Arriva UK operates a bus from Watford to St Albans every 15 minutes. Tickets cost $5 - $8 and the journey takes 35 min. Green Line (operated by Arriva) also services this route every 30 minutes.
From Watford Junction train to St Albans Abbey. 15 min £2. From Watford Junction Railway Station bus to St Albans, Abbey. 35 min £4. From Watford taxi to St Albans. 12 min £37. From Watford drive to St Albans. 12 min £1. From Watford walk to St Albans. 2 h 45 min.