The average train between Carmarthen and Windsor takes 4h 37m and the fastest train takes 3h 54m. There is a train service every few hours from Carmarthen to Windsor. 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 Carmarthen and Windsor. The earliest departure is at 4:37 AM at night, and the last departure from Carmarthen is at 10:41 PM which arrives into Windsor at 7:36 AM. All services require a transfer at Reading and take an average of 4h 37m. The schedules shown below are for the next available departures.



3h 59m • 3 changes



4h 44m • 3 changes



4h 24m • 3 changes



4h 13m • 3 changes



3h 59m • 3 changes



4h 44m • 3 changes



4h 24m • 3 changes



4h 13m • 3 changes



3h 59m • 3 changes



4h 44m • 3 changes



4h 24m • 3 changes



4h 13m • 3 changes
Want to know about travelling from Carmarthen to Windsor? 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. However, there are services departing from Carmarthen station and arriving at Windsor station via Reading. The journey, including transfers, takes approximately 4h 37m.
Carmarthen to Windsor train services, operated by Transport for Wales, depart from Carmarthen station.
Carmarthen to Windsor train services, operated by Transport for Wales, arrive at Reading station.
Book your Carmarthen to Windsor train tickets online with Transport for Wales, Great Western Railway (GWR) and Elizabeth Line (TfL).
The distance between Carmarthen and Windsor is 258.8 km. The road distance is 333 km.
Great Western Railway (GWR) operates a train from Carmarthen to Reading every 4 hours. Tickets cost £80–160 and the journey takes 3h 24m.