How much does a train ticket cost from Carmarthen to London?

The cheapest train tickets from Carmarthen to London start from £41. The average price for this train route is around £72. Busbud recommends booking your tickets in advance for the best chance of getting the lowest possible price.

How long is the train journey from Carmarthen to London?

The average train journey time from Carmarthen to London is 3h 51m, covering a distance of 178 miles. The fastest train gets you there in 3h 39m and is operated by Great Western Railway .

Which train operators serve the Carmarthen to London route?

Several major train operators run on this route with 4 trains available per day.

What are the earliest and latest departure times for the train from Carmarthen to London?

The earliest train from Carmarthen to London departs at 07:23. And the latest train departs at 19:20.

Train Carmarthen to London from £39

Next train departures

Next departures from Carmarthen to London on 1 December
Vehicle type	Departure time	Departure location	Trip duration	Arrival time	Arrival location	Recommended
Train	18:18	Carmarthen	3h 51m	22:09	London Paddington	Cheapest
Train	11:27	Carmarthen	3h 45m	15:12	London Paddington	Fastest
Train	07:23	Carmarthen	3h 57m	11:20	London Paddington	No tags
Train	07:23	Carmarthen	3h 57m	11:20	London Paddington	No tags
Train	09:21	Carmarthen	3h 49m	13:10	London Paddington	No tags

Next departures from Carmarthen to London on 2 December
Vehicle type	Departure time	Departure location	Trip duration	Arrival time	Arrival location	Recommended
Train	18:18	Carmarthen	3h 51m	22:09	London Paddington	Cheapest
Train	11:27	Carmarthen	3h 45m	15:12	London Paddington	Fastest
Train	07:23	Carmarthen	3h 57m	11:20	London Paddington	No tags
Train	07:23	Carmarthen	3h 57m	11:20	London Paddington	No tags
Train	09:21	Carmarthen	3h 49m	13:10	London Paddington	No tags

Last refresh of the prices: Today at 14:24 GMT.

Compare 3 ways to travel from Carmarthen to London

We recommend taking the train

Among the sustainable travel choices, the train stands out as a good way to reach London. The journey takes about 3 hours 51 minutes and with fares starting at just £41, it presents an excellent value for a comfortable ride.

4train per day

3h 51mAverage duration

178 milesDistance

7kgCO₂ emissions

	Average price	Average duration	CO₂ emissions
Bus	Average price£16 - £40	Average duration6h 10m	CO₂ emissions 7kg CO₂e
Train	Average price£41 - £127	Average duration3h 51m	CO₂ emissions 7kg CO₂e
Carpool	Average price£16 - £16	Average duration4h 10m	CO₂ emissions 12kg CO₂e

Train Companies

Great Western Railway

4/542 reviews

Staff5

Timeliness4.7

Cleanliness4.7

WiFi4

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

GB train companies: Amtrak, Trenitalia, Renfe, VIA Rail Canada, RegioJet, FlixTrain, CrossCountry

Frequently asked questions about travelling from Carmarthen to London 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 Carmarthen to London?
The cheapest train tickets from Carmarthen to London start from £41. The average price for this train route is around £72. Busbud recommends booking your tickets in advance for the best chance of getting the lowest possible price.
How long is the train journey from Carmarthen to London?
The average train journey time from Carmarthen to London is 3h 51m, covering a distance of 178 miles. The fastest train gets you there in 3h 39m and is operated by Great Western Railway.
Which train operators serve the Carmarthen to London route?
Several major train operators run on this route with 4 trains available per day.
What are the earliest and latest departure times for the train from Carmarthen to London?
The earliest train from Carmarthen to London departs at 07:23. And the latest train departs at 19:20.

Find cheapest prices for trains

Price is for a one-way ticket for one passenger and based on past searches.

Best price found

28/11

£70

29/11

£70

Today

£70

01/12

£66

02/12

£65

03/12

£39

04/12

£61

05/12

£65

The cheapest trip from Carmarthen to London was searched and found on 3 Dec 2025 with a price of £39

To save money and be sure you have the best seat, it's a good idea to buy your train tickets from Carmarthen to London as early as possible.

You can expect to pay from £39 to £257 for a train ticket from Carmarthen to London based on the last 2 days. You can expect to find the cheapest price for the trip at £39, which is on 2025-12-03.