Thameslink operates a train from Euston Station to St Albans every 15 minutes. Tickets cost $11 - $16 and the journey takes 20 min.
How to get from Euston Station to St Albans
From Euston Station walk to London St Pancras International LL then train to St Albans City. 33 min £9. From Euston Underground Station Tube to Barnet, High Barnet then line 84 bus to St Albans City Railway Station. 1 h 36 min £8. From Euston Station taxi to St Albans. 31 min £91. From Euston Station drive to St Albans. 31 min £4.