The average train between Portsmouth and Swansea takes 4h 52m and the fastest train takes 4h 12m. There is a train service every few hours from Portsmouth to Swansea. 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 Portsmouth and Swansea. The earliest departure is at 6:05 AM in the morning, and the last departure from Portsmouth is at 8:28 PM which arrives into Swansea at 2:11 AM. All services require a transfer, and take on average 4h 52m. The schedules shown below are for the next available departures.

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4h 34m • 1 changeWant to know about travelling from Portsmouth to Swansea? 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 Portsmouth to Swansea. However, there are services departing from Portsmouth & Southsea station and arriving at Swansea station via Cardiff Central station. The journey, including transfers, takes approximately 4h 52m.
Portsmouth to Swansea train services, operated by Great Western Railway (GWR), depart from Portsmouth & Southsea station.
Portsmouth to Swansea train services, operated by Great Western Railway (GWR), arrive at Swansea station.
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The distance between Portsmouth and Swansea is 218.7 km. The road distance is 274 km.
You can take a train from Portsmouth & Southsea to Swansea via Cardiff Central in around 4h 24m.