Thameslink operates a train from Luton to Harpenden every 10 minutes. Tickets cost $5 - $8 and the journey takes 7 min. Alternatively, Arriva UK operates a bus from Luton to Harpenden every 15 minutes. Tickets cost $5 - $8 and the journey takes 14 min.
From Luton train to Harpenden. 7 min £4. From New Town, Holly Street bus to Harpenden, Old Cock Inn. 14 min £4. From Luton taxi to Harpenden. 10 min £28. From Luton drive to Harpenden. 10 min £1. From Luton walk to Harpenden. 1 h 54 min.