Great Northern operates a train from Stevenage to Oxford Circus every 30 minutes. Tickets cost $13 - $19 and the journey takes 18 min. Alternatively, National Express operates a bus from Stevenage to Oxford Circus once daily. Tickets cost $7 - $11 and the journey takes 1 h 15 min.
From Stevenage train to Finsbury Park Underground Station then Tube to Oxford Circus Underground Station. 28 min £14. From Stevenage bus to London Marble Arch. 1 h 15 min £7. From Stevenage taxi to Oxford Circus. 40 min £133. From Stevenage drive to Oxford Circus. 40 min £6. From Stevenage rideshare to London. 1 h 1 min £3.