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

The average train ticket price from London to Carmarthen is $128. The best way to find train tickets from London to Carmarthen is to book your tickets as early as possible. Prices tend to rise as your travel date approaches, so book in advance to secure the best prices!

How long is the train trip from London to Carmarthen?

A train trip between London and Carmarthen is around 3h 42m, although the fastest train will take about 3h 36m. This is the time it takes to travel the 181 miles that separates the two cities.

How many daily trains are there between London and Carmarthen?

The number of trains from London to Carmarthen can differ depending on the day of the week. On average, there are 3. Some trains are direct while others have layovers. Simplify your train trip from London to Carmarthen by comparing and selecting the train that fits your travel style and budget on Busbud.

Which train companies travel from London to Carmarthen?

When taking the train from London to Carmarthen, you can travel comfortably and safely with Great Western Railway.

Train London to Carmarthen from $51

Next train departures

Next departures for London to Carmarthen on November 18
Vehicle type	Departure time	Departure location	Trip duration	Arrival time	Arrival location	Recommended
Train	4:18pm	London Paddington	3h 42m	8:00pm	Carmarthen	CheapestFastest
Train	4:18pm	London Paddington	3h 42m	8:00pm	Carmarthen	No tags
Train	5:48pm	London Paddington	3h 52m	9:40pm	Carmarthen	No tags
Train	5:48pm	London Paddington	3h 52m	9:40pm	Carmarthen	No tags

Last refresh of the prices: Yesterday at 5:13 PM GMT.

Compare 3 ways to go from London to Carmarthen

We recommend carpooling

Among the sustainable travel choices, the carpool stands out as the good way to reach Carmarthen. The journey takes about 4 hours 10 minutes and with fares starting at just $45, it presents an excellent value for a comfortable ride.

1carpool per day

4h 10mAverage Duration

181 milesDistance

12kgCO₂ emissions

	Average Price	Average Duration	CO₂ emissions
Bus	Average Price$21 - $49	Average Duration5h 45m	CO₂ emissions 7kg CO₂e
Train	Average Price$53 - $262	Average Duration3h 42m	CO₂ emissions 7kg CO₂e
Carpool	Average Price$45 - $45	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. Travelers were especially satisfied with the staff and the seats but often complained with the wifi. Great Western Railway ticket prices on this trip start at $53

Train and bus companies in GB:Amtrak, Trenitalia, Renfe, VIA Rail Canada, RegioJet, FlixTrain, CrossCountry

Frequently asked questions about traveling from London to Carmarthen by train

How much does a train ticket from London to Carmarthen cost?
How long is the train trip from London to Carmarthen?
How many daily trains are there between London and Carmarthen?
Which train companies travel from London to Carmarthen?

Find cheapest prices for trains

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

Best price found

11/16

$90

11/17

$84

Today

$84

11/19

$84

11/20

$84

11/21

$69

11/22

$78

11/23

$91

The cheapest trip from London to Carmarthen was searched and found on Nov 21, 2025 with a price of $69

To 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 $69 to $244 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 $69 which is on 2025-11-21.