The average bus between Southall and Portsmouth takes 2h 30m and the fastest bus takes 2h 5m. The bus service runs several times per day from Southall 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.
Buses run every 4 hours between Southall and Portsmouth. The earliest departure is at 12:09 AM at night, and the last departure from Southall is at 10:15 PM which arrives into Portsmouth at 12:30 AM. All services require a transfer, and take on average 2h 30m. The schedules shown below are for the next available departures.

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Want to know about travelling from Southall 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 bus from Southall to Portsmouth. However, there are services departing from Southall station and arriving at Portsmouth station via Heathrow Central Bus Station station. The journey, including transfers, takes approximately 2h 30m.
Southall to Portsmouth bus services, operated by First Bus London, depart from Southall Station.
Southall to Portsmouth bus services, operated by First Bus London, arrive at St Georges Square station.
The distance between Southall and Portsmouth is 93.6 km. The road distance is 115 km.
You can take a bus from Southall Station to St Georges Square via Heathrow Central Bus Station in around 3h 18m.