Next bus departures
| Operated by | Vehicle type | Departure time | Departure location | Trip duration | Arrival time | Arrival location | Recommended | Price and booking link |
|---|---|---|---|---|---|---|---|---|
 | Bus | Cardiff (Gabalfa Interchange, o/s Clinic) | Portsmouth University (Spinnaker Sports Centre) | Cheapest | ||||
| Bus | Cardiff (Gabalfa Interchange, o/s Clinic) | Portsmouth University (Spinnaker Sports Centre) | Fastest | ||||
| Bus | Cardiff (Gabalfa Interchange, o/s Clinic) | Portsmouth University (Spinnaker Sports Centre) | No tags | ||||
| Bus | Cardiff (Gabalfa Interchange, o/s Clinic) | Portsmouth University (Spinnaker Sports Centre) | No tags | ||||
| Bus | Cardiff (Gabalfa Interchange, o/s Clinic) | Portsmouth University (Spinnaker Sports Centre) | 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 the good way to reach Portsmouth. The journey takes about 3 hours and with fares starting at just $32, it presents an excellent value for a comfortable ride.
Where are the popular stops in Cardiff and Portsmouth?
Stops in Cardiff
- A2 Sophia Cl, Cardiff CF11, UK
- B
Cardiff University (o/s Cathays Rail Stn)
50 Park Place (Bus Stop, o/s Cathays Rail Stn), Cardiff CF10 - C
Cardiff Coach Station - Sophia Gardens
22 Cathedral Rd, Cardiff CF11 9LJ, UK - D
Cardiff - Castle Street Bus Stop
21A Castle St, Cardiff CF10 1BT, UK - E
National Museum
Gorsedd Gardens Rd, Cardiff CF10 3NP, UK - F
Cardiff Bus Stop - Westgate
206 Westgate St, Cardiff CF10, UK
Stops in Portsmouth
- A
The Hard Interchange
6 The Hard, Portsmouth PO1 3DT, UK - B
Portsmouth (Rudmore Roundabout)
Kingston Crescent (Bus Stop, near Air Balloon), Portsmouth PO2 - CPortsmouth International Port, George Byng Way, Portsmouth PO2 8SP, UK
- D
International Port
George Byng Way, Portsmouth Port Terminal, Portsmouth PO2 - E
Hilsea Bus Stop (Drayton Garage Services)
London Road, Portsmouth PO2 - F
Portsmouth Bus Stop The Hard F
95 Commercial Rd, Portsmouth, Portsmouth PO1 1BQ, UK
Compare bus companies
Based on 29736 reviews, the company was rated 4.2 stars on Busbud. Travelers were especially satisfied with the ticket access and the staff but often complained with the wifi. National Express ticket prices on this trip start at $16
National Express Cardiff Portsmouth recent customer reviews
The triproblem was good all through the journey
Jenelle A.
Frequently asked questions about traveling from Cardiff to Portsmouth by bus
Please note that schedules, routes, or operator details shown here may be updated or vary at the time of your trip.
How much is the bus ticket from Cardiff to Portsmouth?
The cheapest bus tickets from Cardiff to Portsmouth start from $16. The average price for this route is around $29. Busbud recommends that you book your tickets in advance for a better chance to get the lowest possible price.
How long is the bus ride from Cardiff to Portsmouth?
The average bus trip duration from Cardiff to Portsmouth is 7h 20m, covering a distance of 104 miles (167 km). The quickest bus can get you there in 6h 15m and is operated by National Express.
Which bus companies service the Cardiff to Portsmouth route?
Several major train operators operate on this route with 9 trains available per day.
What is the earliest and latest departure time for the bus from Cardiff to Portsmouth?
The earliest bus departs from Cardiff to Portsmouth at 3:25am. And the latest bus departs at 7:58pm.
What are the CO₂ emissions for the bus trip from Cardiff to Portsmouth?
A bus trip from Cardiff to Portsmouth generates an estimated 4 kg of CO₂, making it a highly eco-friendly travel option and recommended mode of travel by Busbud.
Find cheapest prices for buses
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 Dec 1, 2025 with a price of $16To save money and be sure you have the best seat, it's a good idea to buy your bus tickets from Cardiff to Portsmouth, as early as possible.
You can expect to pay from $16 to $69 for a bus ticket from Cardiff to Portsmouth based on the last 2 days. You can expect to find the cheapest price for the trip at $16 which is on 2025-12-01.
What's the cheapest way to go from Cardiff to Portsmouth?
The bus is the cheapest travel choice for this destination
