From Brighton train to London Bridge Underground Station, Tube to West Ham, then train to Southend Central. 2 h 14 min £33. From Brighton train to Victoria Stn Grosvenor Gdns, line 11 bus to London Liverpool Street, then train to Southend Victoria. 2 h 49 min £44. From Brighton drive to Southend-on-Sea. 1 h 34 min £16.