West Midlands operates a train from Watford to Berkhamsted every 20 minutes. Tickets cost $4 - $7 and the journey takes 15 min. Alternatively, Arriva UK operates a bus from Watford to Berkhamsted every 20 minutes. Tickets cost $5 - $8 and the journey takes 1 h 7 min. Red Rose Travel also services this route every 4 hours.
From Watford Junction train to Berkhamsted. 15 min £3. From Watford, Market Street bus to Berkhamsted, Kings Road. 1 h 7 min £4. From Watford taxi to Berkhamsted. 16 min £50. From Watford drive to Berkhamsted. 16 min £2.