The average train between Carmarthen and Windsor Castle takes 4h 23m and the fastest train takes 4h 1m. The train service runs several times per day from Carmarthen to Windsor Castle. 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 every 4 hours between Carmarthen and Windsor Castle. The earliest departure is at 6:13 AM in the morning, and the last departure from Carmarthen is at 7:20 PM which arrives into Windsor Castle at 11:21 PM. All services require a transfer at Reading and take an average of 4h 23m. The schedules shown below are for the next available departures.


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4h 16m • 2 changesWant to know about travelling from Carmarthen to Windsor Castle? 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 Carmarthen to Windsor Castle. However, there are services departing from Carmarthen station and arriving at Reading station via Reading station. The journey, including transfers, takes approximately 4h 23m.
Carmarthen to Windsor Castle train services, operated by Great Western Railway (GWR), depart from Carmarthen station.
Carmarthen to Windsor Castle train services, operated by Great Western Railway (GWR), arrive at Reading station.
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The distance between Carmarthen and Windsor Castle is 258.5 km. The road distance is 304 km.
Great Western Railway (GWR) operates a train from Carmarthen to Reading every 4 hours. Tickets cost £75–140 and the journey takes 3h 18m.