The average bus between Watford and Cardiff takes 4h 46m and the fastest bus takes 3h 59m. There is a bus service every few hours from Watford 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 Watford and Cardiff. The earliest departure is at 5:57 AM in the morning, and the last departure from Watford is at 11:01 PM which arrives into Cardiff at 4:00 AM. All services require a transfer at Heathrow Terminal 2 and take an average of 4h 46m. The schedules shown below are for the next available departures.

4h 37m • 1 change

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5h 8m • 1 change
Want to know about travelling from Watford 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 Watford to Cardiff. However, there are services departing from Watford station and arriving at Cardiff station via Sophia Gardens. The journey, including transfers, takes approximately 4h 46m.
Watford to Cardiff bus services, operated by First Berkshire & The Thames Valley, depart from Heathrow Central Bus Station.
Watford to Cardiff bus services, operated by First Berkshire & The Thames Valley, arrive at Sophia Gardens station.
The distance between Watford and Cardiff is 193.4 km. The road distance is 258 km.
National Express operates a bus from Heathrow Central Bus Station to Sophia Gardens hourly. Tickets cost £26–65 and the journey takes 2h 55m.