Next departures
| Operated by | Vehicle type | Departure time | Departure location | Trip duration | Arrival time | Arrival location | Recommended | Price and booking link |
|---|---|---|---|---|---|---|---|---|
 | Cardiff Central | Portsmouth and Southsea | Cheapest | |||||
| Cardiff Central | Portsmouth and Southsea | Fastest | |||||
| Cardiff Central | Portsmouth and Southsea | No tags | |||||
| Cardiff Central | Portsmouth and Southsea | No tags | |||||
| Cardiff Central | Portsmouth and Southsea | No tags |
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Compare 3 ways to go from Cardiff to Portsmouth.
Busbud recommends taking the bus from Cardiff to PortsmouthAmong the sustainable travel choices, the bus stands out as the good way to reach Portsmouth. The journey takes about 7 hours 17 minutes and with fares starting at just $15, it presents an excellent value for a comfortable ride.
Train Cardiff to Portsmouth: Trip Overview
Please note, this information is subject to change.
Train Companies
Based on 41 reviews, the company was rated 3.9 stars on Busbud. Travelers were especially satisfied with the staff and the seats but often complained with the value for money. Great Western Railway ticket prices on this trip start at $77
Cardiff to Portsmouth Train
Busbud helps you find a train from Cardiff to Portsmouth. Get the best fare and schedule, book a round trip ticket or find trains with WiFi and electrical outlets.
We make sure you can find a train service from Cardiff to Portsmouth from the most reliable train companies operating this trip.
Discover how much the train trip from Cardiff to Portsmouth will cost you. Use our filters and sorting features to find the cheapest train tickets or high-end trains.
Frequently asked questions for your trip Cardiff - Portsmouth
Find cheapest prices for trains
Price is for a one-way ticket for one passenger and based on past searches.
The cheapest trip from Cardiff to Portsmouth was searched and found on Oct 2, 2025 with a price of $74To save money and be sure you have the best seat, it's a good idea to buy your train tickets from Cardiff to Portsmouth, as early as possible.
You can expect to pay from $74 to $104 for a train ticket from Cardiff to Portsmouth based on the last 2 days. You can expect to find the cheapest price for the trip at $74 which is on 2025-10-02.
About Train Travel
Train Travel Tips
There are many train stations in the world, check it station pages on Busbud to get all information you need.
Regional train? High-speed train? Whichever train to Portsmouth you take, you’ll help reduce the environmental impact and carbon footprint of your trip. As you watch the landscapes unfold before your eyes, you can tell yourself that with this choice, you are making sure they remain protected.
With up to 30x less CO2 emissions for your train journey between Cardiff and Portsmouth, the train is an ecological alternative to flights or personal cars.
Tune out to the fine sounds of your best music playlist on your train trip from Cardiff to Portsmouth while indulging in miles on end of beautiful scenic views.
Did you know?
The magnetic levitation train (Maglev for short) is currently the fastest train in the world. With a speed of 603 km/ h, it is closely followed by the French high-speed train (574.8 km / h) which remains in 2020, the fastest train to date
One of the deepest train stations in the world is in Kiev. Located at a depth of 105 m, it was designed in this way to serve as a shelter in the event of an attack. The second deepest station is in China. Badaling station is located 60 m under the Great Wall of China!
Japanese trains are always on time, it is extremely infrequent to see breakdowns during peak periods. In the event of a delay of more than 5 minutes, the crew will personally apologize to each passenger.
Top Traveled Train Routes
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