The average bus between Harpenden and Cardiff takes 6h 13m and the fastest bus takes 5h 4m. There is a bus service every few hours from Harpenden to Cardiff. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Buses run hourly between Harpenden and Cardiff. The earliest departure is at 5:01 AM in the morning, and the last departure from Harpenden is at 9:51 PM which arrives into Cardiff at 3:25 AM. All services require a transfer at Watford Junction station and take an average of 6h 13m. The schedules shown below are for the next available departures.
Arrives next day


6h 20m • 2 changes
Arrives next day


5h 4m • 2 changes
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5h 29m • 2 changes
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5h 34m • 2 changes


5h 44m • 2 changes


6h 24m • 2 changes


6h 27m • 2 changes


6h 20m • 2 changes


5h 44m • 2 changes


6h 24m • 2 changes


6h 27m • 2 changes


6h 20m • 2 changes


5h 44m • 2 changes


6h 24m • 2 changes


6h 27m • 2 changes


6h 20m • 2 changes


5h 46m • 2 changes


6h 34m • 2 changes


6h 37m • 2 changes


6h 32m • 2 changes
Want to know about travelling from Harpenden to Cardiff? 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 bus from Harpenden to Cardiff. However, there are services departing from Harpenden station and arriving at Cardiff station via Cardiff North Road. The journey, including transfers, takes approximately 6h 13m.
Harpenden to Cardiff bus services, operated by Arriva UK, depart from London Heathrow Airport station.
Harpenden to Cardiff bus services, operated by Arriva UK, arrive at Cardiff North Road station.
The distance between Harpenden and Cardiff is 198.3 km. The road distance is 294 km.
FlixBus operates a bus from London Heathrow Airport to Cardiff North Road hourly. Tickets cost £14–25 and the journey takes 3h 40m.