Next train departures
| Operated by | Vehicle type | Departure time | Departure location | Trip duration | Arrival time | Arrival location | Recommended | Price and booking link |
|---|---|---|---|---|---|---|---|---|
 | Train | London Paddington | Carmarthen | Cheapest | ||||
| Train | London Paddington | Carmarthen | Fastest | ||||
| Train | London Paddington | Carmarthen | No tags | ||||
| Train | London Paddington | Carmarthen | No tags | ||||
| Train | London Paddington | Carmarthen | No tags |
Last refresh of the prices: Yesterday at 00:06 GMT.
Compare 3 ways to travel from London to Carmarthen
Among the sustainable travel choices, the carpool stands out as a good way to reach Carmarthen. The journey takes about 4 hours 10 minutes and with fares starting at just £34, it presents an excellent value for a comfortable ride.
Train Companies
Based on 42 reviews, the company was rated 4 stars on Busbud. Travellers were especially satisfied with the staff and the seats but often complained with the Wi-Fi. Great Western Railway ticket prices on this trip start at £41
Frequently asked questions about travelling from London to Carmarthen by train
Please note that timetables, routes, or operator details shown here may be updated or vary at the time of your journey.
How much does a train ticket cost from London to Carmarthen?
The cheapest train tickets from London to Carmarthen start from £41. The average price for this train route is around £97. Busbud recommends booking your tickets in advance for the best chance of getting the lowest possible price.
How long is the train journey from London to Carmarthen?
The average train journey time from London to Carmarthen is 3h 41m, covering a distance of 178 miles. The fastest train gets you there in 3h 33m and is operated by Great Western Railway.
Which train operators serve the London to Carmarthen route?
Several major train operators run on this route with 3 trains available per day.
What are the earliest and latest departure times for the train from London to Carmarthen?
The earliest train from London to Carmarthen departs at 08:46. And the latest train departs at 17:48.
Find cheapest prices for trains
Price is for a one-way ticket for one passenger and based on past searches.
The cheapest trip from London to Carmarthen was searched and found on 10 Dec 2025 with a price of £44To save money and be sure you have the best seat, it's a good idea to buy your train tickets from London to Carmarthen as early as possible.
You can expect to pay from £44 to £258 for a train ticket from London to Carmarthen based on the last 2 days. You can expect to find the cheapest price for the trip at £47, which is on 2025-12-17.
