The average bus between Slough and Portsmouth Harbour takes 2h 11m and the fastest bus takes 2h. The bus service runs several times per day from Slough to Portsmouth Harbour. 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 Slough and Portsmouth Harbour. The earliest departure is at 12:00 AM at night, and the last departure from Slough is at 10:30 PM which arrives into Portsmouth Harbour at 12:30 AM. All services require a transfer at Heathrow Terminal 5 and take an average of 2h 11m. The schedules shown below are for the next available departures.

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Want to know about travelling from Slough to Portsmouth Harbour? 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 Slough to Portsmouth Harbour. However, there are services departing from Slough station and arriving at Portsmouth Harbour station via Heathrow Terminal 5. The journey, including transfers, takes approximately 2h 11m.
Slough to Portsmouth Harbour bus services, operated by Thames Valley Buses, depart from Wellington Street Stop A station.
Slough to Portsmouth Harbour bus services, operated by Thames Valley Buses, arrive at St Georges Square station.
Book your Slough to Portsmouth Harbour bus tickets online with Thames Valley Buses and National Express.
The distance between Slough and Portsmouth Harbour is 86.9 km. The road distance is 115 km.
You can take a bus from Wellington Street Stop A to Portsmouth Harbour via Heathrow Terminal 5 and St Georges Square in around 2h 59m.