The average train between Dunstable and Portsmouth takes 3h and the fastest train takes 2h 35m. The train runs at least 2 times per hour from Dunstable 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 every 30 minutes between Dunstable and Portsmouth. The earliest departure is at 1:36 AM at night, and the last departure from Dunstable is at 11:28 PM which arrives into Portsmouth at 7:15 AM. All services require a transfer at West Hampstead Thameslink and take an average of 3h. The schedules shown below are for the next available departures.


2h 53m • 2 changes


3h 5m • 2 changes
Arrives next day


2h 55m • 2 changes
Arrives next day


3h 14m • 2 changes


3h 11m • 2 changes


3h 3m • 2 changes


2h 52m • 2 changes


2h 44m • 2 changes


5h 39m • 2 changes


3h 11m • 2 changes


3h 3m • 2 changes


2h 52m • 2 changes
Want to know about travelling from Dunstable 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 Dunstable to Portsmouth. However, there are services departing from Dunstable station and arriving at Portsmouth station via West Hampstead Thameslink. The journey, including transfers, takes approximately 3h.
Dunstable to Portsmouth train services, operated by Thameslink, depart from Leagrave station.
Dunstable to Portsmouth train services, operated by Thameslink, arrive at Portsmouth & Southsea station.
Book your Dunstable to Portsmouth train tickets online with Thameslink, London Underground (Tube) and South Western Railway.
The distance between Dunstable and Portsmouth is 127.1 km. The road distance is 173 km.
You can take a train from Leagrave to Portsmouth & Southsea via West Hampstead Thameslink, West Hampstead station, Waterloo station, and London Waterloo in around 2h 29m.