c2c operates a train from Dartford to Southend-on-Sea every 30 minutes. Tickets cost $5 - $7 and the journey takes 6 min. c2c also services this route hourly. Alternatively, Arriva UK operates a bus from Dartford to Southend-on-Sea every 30 minutes. Tickets cost $5 - $8 and the journey takes 16 min. 2 other operators also service this route.
From Purfleet train to Grays then train to Southend Central. 1 h 4 min £8. From Purfleet, Railway Station (Purfleet Rail) line 44 bus to Grays, Bus Station (Grays Bus Stn), line 100 bus to Basildon Town Centre, Bus Station (Basil'n Bus Stn), then line 28 bus to Southend-on-Sea, Victoria Station Interchange (Victoria Stn). 2 h 20 min £5. From Dartford taxi to Southend-on-Sea. 38 min £76. From Dartford drive to Southend-on-Sea. 38 min £5.