Which London station Southampton to London?
The fastest, most direct services run from London Waterloo, operated by South West Trains. Up to three trains per hour run from Waterloo to Southampton Central, taking about 75 minutes.
An alternative service, usually hourly, runs from London Victoria via Gatwick Airport and Chichester. Operated by Southern, this takes much longer, at around 2 hours and 15 minutes, but can sometimes be cheaper, depending on what advance purchase fares and offers are available.