Next train departures
| Operated by | Vehicle type | Departure time | Departure location | Trip duration | Arrival time | Arrival location | Recommended | Price and booking link |
|---|---|---|---|---|---|---|---|---|
 | Train | Cardiff Central | Portsmouth and Southsea | Cheapest | ||||
| Train | Cardiff Central | Portsmouth and Southsea | Fastest | ||||
| Train | Cardiff Central | Portsmouth and Southsea | No tags | ||||
| Train | Cardiff Central | Portsmouth and Southsea | No tags | ||||
| Train | Cardiff Central | Portsmouth and Southsea | No tags |
Last refresh of the prices: Last Tuesday at 4:27 AM GMT.
Compare 3 ways to go from Cardiff to Portsmouth
Among the sustainable travel choices, the carpool stands out as a good way to reach Portsmouth. The journey takes about 3 hours, and with fares starting at just $46, it presents an excellent value for a comfortable ride.
Train companies
Based on 42 reviews, the company was rated 4 stars on Busbud. Travellers were especially satisfied with the staff and the seats but often complained with the WiFi. Great Western Railway ticket prices on this trip start at $60
Frequently asked questions about travelling from Cardiff to Portsmouth by train
How much does a cheap train ticket from Cardiff to Portsmouth cost?
The average train ticket price from Cardiff to Portsmouth is $151. The best way to find cheap train tickets from Cardiff to Portsmouth is to book your tickets as early as possible. Prices tend to rise as your travel date approaches, so book in advance to secure the best prices!
How long is the trip from Cardiff to Portsmouth?
A train trip between Cardiff and Portsmouth is around 3h 19m, although the fastest train will take about 3h 15m. This is the time it takes to travel the 165 km that separates the two cities.
How many daily trains are there between Cardiff and Portsmouth?
The number of trains from Cardiff to Portsmouth can differ depending on the day of the week. On average, there are 10. Some trains are direct while others include transferring trains. Simplify your train trip from Cardiff to Portsmouth by comparing and selecting the train that fits your travel style and budget on Busbud.
Which train companies travel from Cardiff to Portsmouth?
When taking the train from Cardiff to Portsmouth, you can travel comfortably and safely with Great Western Railway.
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 Nov 29, 2025 with a price of $106To 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 $106 to $145 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 $106 which is on 2025-11-29.
