From London Waterloo train to Southampton Central. 1 h 17 min £26. From Waterloo Station drive to Port of Southampton. 1 h 32 min £15. From Waterloo Station walk to London then rideshare to Southampton. 2 h 9 min £5.
Train from Waterloo Station to Port of Southampton
South Western Railway operates a train from Waterloo Station to Port of Southampton hourly. Tickets cost $27 - $45 and the journey takes 1 h 17 min.