The average bus between Portsmouth Harbour and Slough takes 2h 19m and the fastest bus takes 1h 58m. The bus service runs several times per day from Portsmouth Harbour to Slough. 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 Portsmouth Harbour and Slough. The earliest departure is at 3:20 AM at night, and the last departure from Portsmouth Harbour is at 8:10 PM which arrives into Slough at 10:56 PM. All services require a transfer at The Hard Interchange and take an average of 2h 19m. The schedules shown below are for the next available departures.

2h 5m • 1 change

2h 3m • 1 change

2h 26m • 1 change

2h 23m • 1 change

2h 5m • 1 change

2h 3m • 1 change

2h 26m • 1 change

2h 23m • 1 change

2h 5m • 1 change

2h 3m • 1 change

2h 26m • 1 change

2h 23m • 1 change

2h 5m • 1 change

2h 3m • 1 change

2h 26m • 1 change

2h 26m • 1 change

2h 5m • 1 change

1h 59m • 1 change

2h 16m • 1 change

2h 26m • 1 change

2h 5m • 1 change

1h 58m • 1 change

2h 16m • 1 change

2h 26m • 1 change
Want to know about travelling from Portsmouth Harbour to Slough? 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 Portsmouth Harbour to Slough. However, there are services departing from Portsmouth Harbour station and arriving at Slough station via Heathrow Terminal 5. The journey, including transfers, takes approximately 2h 19m.
Portsmouth Harbour to Slough bus services, operated by National Express, depart from The Hard Interchange station.
Portsmouth Harbour to Slough bus services, operated by National Express, arrive at Landmark Place station.
Book your Portsmouth Harbour to Slough bus tickets online with National Express and Thames Valley Buses.
The distance between Portsmouth Harbour and Slough is 86.9 km. The road distance is 112 km.
You can take a vehicle from Portsmouth Harbour to Landmark Place via The Hard Interchange and Heathrow Terminal 5 in around 2h 12m.