The average train between Watford Junction and Caerphilly takes 3h 37m and the fastest train takes 2h 58m. There is an hourly train service from Watford Junction to Caerphilly. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Trains run hourly between Watford Junction and Caerphilly. The earliest departure is at 5:57 AM in the morning, and the last departure from Watford Junction is at 10:48 PM which arrives into Caerphilly at 8:30 AM. All services require a transfer at Harrow & Wealdstone and take an average of 3h 37m. The schedules shown below are for the next available departures.



3h 12m • 3 changes


3h 18m • 3 changes


3h 8m • 3 changes


3h 25m • 3 changes


3h 3m • 3 changes


3h 5m • 3 changes


3h 19m • 3 changes


3h 19m • 3 changes


3h 49m • 3 changes


3h 52m • 3 changes


3h 23m • 3 changes


3h 26m • 3 changesWant to know about travelling from Watford Junction to Caerphilly? 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 train from Watford Junction to Caerphilly. However, there are services departing from Watford Junction station and arriving at Caerphilly station via Cardiff Central. The journey, including transfers, takes approximately 3h 37m.
Watford Junction to Caerphilly train services, operated by West Midlands Trains, depart from London Paddington station.
Watford Junction to Caerphilly train services, operated by West Midlands Trains, arrive at Cardiff Central station.
Book your Watford Junction to Caerphilly train tickets online with West Midlands Trains, London Underground (Tube) and 4 other operators.
The distance between Watford Junction and Caerphilly is 195.1 km. The road distance is 270 km.
Great Western Railway (GWR) operates a train from London Paddington to Cardiff Central hourly. Tickets cost £60–120 and the journey takes 1h 56m.