The average train between Watford and Llanelli takes 4h 24m and the fastest train takes 4h 2m. There is a train service every few hours from Watford to Llanelli. 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 and Llanelli. The earliest departure is at 5:48 AM in the morning, and the last departure from Watford is at 9:48 PM which arrives into Llanelli at 5:31 AM. All services require a transfer at Queens Park (London) and take an average of 4h 24m. The schedules shown below are for the next available departures.



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4h 34m • 3 changesWant to know about travelling from Watford to Llanelli? 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 to Llanelli. However, there are services departing from London Paddington station and arriving at Swansea station via Swansea station. The journey, including transfers, takes approximately 4h 24m.
Watford to Llanelli train services, operated by Great Western Railway (GWR), depart from London Paddington station.
Watford to Llanelli train services, operated by Great Western Railway (GWR), arrive at Swansea station.
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The distance between Watford and Llanelli is 259.7 km. The road distance is 311 km.
Great Western Railway (GWR) operates a train from London Paddington to Swansea hourly. Tickets cost £80–150 and the journey takes 2h 48m.