Greater Anglia operates a train from Hertford to Southend-on-Sea hourly. Tickets cost $12 - $18 and the journey takes 49 min. Greater Anglia also services this route every 30 minutes. Alternatively, Green Line (operated by Arriva) operates a bus from Hertford to Southend-on-Sea every 20 minutes. Tickets cost $5 and the journey takes 25 min. 3 other operators also service this route.
From Hertford East train to London Liverpool Street then train to Southend Victoria. 2 h £26. From Hertford, Bus Station line 724 bus to Harlow Town Centre, Bus Station (Harlow Bus Stn), line 59 bus to Chelmsford City Centre, Bus Station (Chelm Bus Stn), then bus to Southend-on-Sea, Victoria Station Interchange (Victoria Stn). 2 h 42 min £9. From Hertford taxi to Southend-on-Sea. 56 min £208. From Hertford drive to Southend-on-Sea. 56 min £9.