The average train between Southampton and Watford takes 2h 44m and the fastest train takes 2h 3m. There is a train service every few hours from Southampton to Watford. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Trains run hourly between Southampton and Watford. The earliest departure is at 4:52 AM at night, and the last departure from Southampton is at 10:00 PM which arrives into Watford at 5:44 AM. All services require a transfer, and take on average 2h 44m. The schedules shown below are for the next available departures.

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2h 21m • 1 change

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2h 24m • 1 change

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2h 21m • 1 change
Want to know about travelling from Southampton to Watford? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct train from Southampton to Watford. However, there are services departing from Southampton station and arriving at Watford station via Clapham Junction. The journey, including transfers, takes approximately 2h 44m.
Southampton to Watford train services, operated by South Western Railway, depart from Southampton Central station.
Southampton to Watford train services, operated by South Western Railway, arrive at Watford Junction station.
Book your Southampton to Watford train tickets online with South Western Railway and Southern.
The distance between Southampton and Watford is 109.1 km. The road distance is 149 km.
You can take a train from Southampton Central to Watford Junction via Clapham Junction in around 2h 32m.