The average train between Slough and Portsmouth takes 2h 34m and the fastest train takes 2h 16m. There is a train service every few hours from Slough to Portsmouth. 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 Slough and Portsmouth. The earliest departure is at 5:47 AM in the morning, and the last departure from Slough is at 9:54 PM which arrives into Portsmouth at 12:20 AM. All services require a transfer at Reading and take an average of 2h 34m. The schedules shown below are for the next available departures.


2h 18m • 2 changes


2h 27m • 2 changes


2h 26m • 2 changes


2h 26m • 2 changes


2h 23m • 2 changes


2h 54m • 2 changes


2h 17m • 2 changes


2h 45m • 2 changes


2h 23m • 2 changes


2h 54m • 2 changes


2h 17m • 2 changes


2h 45m • 2 changes


2h 23m • 2 changes


2h 54m • 2 changes


2h 17m • 2 changes


2h 45m • 2 changes
Want to know about travelling from Slough to Portsmouth? 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 Slough to Portsmouth. However, there are services departing from Slough station and arriving at Portsmouth station via Reading. The journey, including transfers, takes approximately 2h 34m.
Slough to Portsmouth train services, operated by Great Western Railway (GWR), depart from Slough station.
Slough to Portsmouth train services, operated by Great Western Railway (GWR), arrive at Portsmouth & Southsea station.
Book your Slough to Portsmouth train tickets online with Great Western Railway (GWR), Cross Country and 2 other operators.
The distance between Slough and Portsmouth is 86.2 km. The road distance is 128 km.
You can take a train from Slough to Portsmouth & Southsea via Reading and Basingstoke in around 2h 44m.