OASA operates a train from Athens to Kiáto every 10 minutes. Tickets cost $2 and the journey takes 24 min. Greek Railways (OSE) also services this route every 2 hours. Alternatively, KTEL Korinthias operates a bus from Athens to Kiáto every 4 hours. Tickets cost $7 - $11 and the journey takes 1 h 15 min. 2 other operators also service this route.
From Στ.Ομονοιασ subway to Nerantziotissa then train to Kiato. 2 h 35 min 9€. From Athens bus to Loutraki, bus to Corinth, then bus to Kiato. 3 h 13 min 13€. From Athens taxi to Kiáto. 1 h 12 min 100€. From Athens drive to Kiáto. 1 h 12 min 16€.