How much does a train ticket from Cardiff to Portsmouth cost?

The average train ticket price from Cardiff to Portsmouth is $105. The best way to find 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 train 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 102 miles 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 have layovers. 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.

Train Cardiff to Portsmouth from $40

Next train departures

Next departures for Cardiff to Portsmouth on November 20
Vehicle type	Departure time	Departure location	Trip duration	Arrival time	Arrival location	Recommended
Train	7:27am	Cardiff Central	3h 21m	10:48am	Portsmouth and Southsea	Cheapest
Train	10:30am	Cardiff Central	3h 17m	1:47pm	Portsmouth and Southsea	Fastest
Train	7:27am	Cardiff Central	3h 21m	10:48am	Portsmouth and Southsea	No tags
Train	8:27am	Cardiff Central	3h 20m	11:47am	Portsmouth and Southsea	No tags
Train	8:27am	Cardiff Central	3h 20m	11:47am	Portsmouth and Southsea	No tags

Last refresh of the prices: Today at 9:34 AM GMT.

Compare 3 ways to go from Cardiff to Portsmouth

We recommend taking the bus

Among the sustainable travel choices, the bus stands out as the good way to reach Portsmouth. The journey takes about 7 hours 20 minutes and with fares starting at just $16, it presents an excellent value for a comfortable ride.

9bus per day

7h 20mAverage Duration

104 milesDistance

4kgCO₂ emissions

	Average Price	Average Duration	CO₂ emissions
Bus	Average Price$16 - $65	Average Duration7h 20m	CO₂ emissions 4kg CO₂e
Train	Average Price$42 - $108	Average Duration3h 19m	CO₂ emissions 4kg CO₂e
Carpool	Average Price$32 - $32	Average Duration3h	CO₂ emissions 7kg CO₂e

Train Companies

Great Western Railway

4/542 reviews

Staff5

Timeliness4.7

Cleanliness4.7

Wifi4

Based on 42 reviews, the company was rated 4 stars on Busbud. Travelers 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 $42

Train and bus companies in GB:Amtrak, Trenitalia, Renfe, VIA Rail Canada, RegioJet, FlixTrain, CrossCountry

Frequently asked questions about traveling from Cardiff to Portsmouth by train

How much does a train ticket from Cardiff to Portsmouth cost?
How long is the train trip from Cardiff to Portsmouth?
How many daily trains are there between Cardiff and Portsmouth?
Which train companies travel from Cardiff to Portsmouth?

Find cheapest prices for trains

Price is for a one-way ticket for one passenger and based on past searches.

Best price found

11/17

$41

11/18

No data

Today

$98

11/20

$99

11/21

No data

11/22

No data

11/23

No data

11/24

$90

The cheapest trip from Cardiff to Portsmouth was searched and found on Nov 17, 2025 with a price of $41

To 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 $41 to $102 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 $90 which is on 2025-11-24.