The average bus between Watford Junction and Cardiff takes 4h 51m and the fastest bus takes 4h 3m. There is a bus service every few hours from Watford Junction 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 Junction and Cardiff. The earliest departure is at 6:04 AM in the morning, and the last departure from Watford Junction is at 10:58 PM which arrives into Cardiff at 4:00 AM. All services require a transfer at Heathrow Terminal 2 and take an average of 4h 51m. The schedules shown below are for the next available departures.

5h 15m • 1 change

4h 40m • 1 change

5h 23m • 1 change

4h 49m • 1 change

4h 56m • 1 change

4h 43m • 1 change

4h 3m • 1 change

5h 1m • 1 change

4h 56m • 1 change

5h 3m • 1 change

4h 23m • 1 change

5h 1m • 1 change

4h 56m • 1 change

5h 3m • 1 change

4h 23m • 1 change

5h 1m • 1 change
Want to know about travelling from Watford Junction 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 Junction to Cardiff. However, there are services departing from Watford Junction station and arriving at Cardiff station via Heathrow Terminal 2. The journey, including transfers, takes approximately 4h 51m.
Watford Junction to Cardiff bus services, operated by Arriva UK, depart from Watford Junction station.
Watford Junction to Cardiff bus services, operated by Arriva UK, arrive at Sophia Gardens station.
The distance between Watford Junction and Cardiff is 193.5 km. The road distance is 259 km.
You can take a bus from Watford Junction station to Sophia Gardens via Heathrow Terminal 2 and Heathrow Central Bus Station in around 4h 7m.