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

The average train ticket price from Carmarthen to London is $131. The best way to find cheap train tickets from Carmarthen to London 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 trip from Carmarthen to London?

A train trip between Carmarthen and London is around 3h 51m, although the fastest train will take about 3h 39m. This is the time it takes to travel the 292 km that separates the two cities.

How many daily trains are there between Carmarthen and London?

The number of trains from Carmarthen to London can differ depending on the day of the week. On average, there are 4. Some trains are direct while others include transferring trains. Simplify your train trip from Carmarthen to London by comparing and selecting the train that fits your travel style and budget on Busbud.

Which train companies travel from Carmarthen to London?

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

Train Carmarthen to London from $72

Next train departures

Next departures for Carmarthen to London on November 15
Vehicle type	Departure time	Departure location	Trip duration	Arrival time	Arrival location	Recommended
Train	3:28pm	Carmarthen	3h 45m	7:13pm	London Paddington	CheapestFastest
Train	3:28pm	Carmarthen	3h 45m	7:13pm	London Paddington	No tags
Train	5:30pm	Carmarthen	4h 25m	9:55pm	London Paddington	No tags
Train	5:30pm	Carmarthen	4h 25m	9:55pm	London Paddington	No tags

Next departures for Carmarthen to London on November 16
Vehicle type	Departure time	Departure location	Trip duration	Arrival time	Arrival location	Recommended
Train	11:56am	Carmarthen	4h 29m	4:25pm	London Paddington	Cheapest
Train	4:30pm	Carmarthen	3h 55m	8:25pm	London Paddington	Fastest
Train	11:56am	Carmarthen	4h 29m	4:25pm	London Paddington	No tags
Train	2:15pm	Carmarthen	4h 10m	6:25pm	London Paddington	No tags
Train	2:15pm	Carmarthen	4h 10m	6:25pm	London Paddington	No tags

Next departures for Carmarthen to London on November 20
Vehicle type	Departure time	Departure location	Trip duration	Arrival time	Arrival location	Recommended
Train	6:18pm	Carmarthen	3h 51m	10:09pm	London Paddington	Cheapest
Train	11:27am	Carmarthen	3h 45m	3:12pm	London Paddington	Fastest
Train	7:23am	Carmarthen	3h 57m	11:20am	London Paddington	No tags
Train	7:23am	Carmarthen	3h 57m	11:20am	London Paddington	No tags
Train	9:21am	Carmarthen	3h 49m	1:10pm	London Paddington	No tags

Last refresh of the prices: Yesterday at 10:35 PM GMT.

Compare 3 ways to go from Carmarthen to London

We recommend carpooling

Among the sustainable travel choices, the carpool stands out as a good way to reach London. The journey takes about 3 hours 50 minutes, and with fares starting at just $43, it presents an excellent value for a comfortable ride.

1carpool per day

3h 50mAverage Duration

292 kmDistance

12kgCO₂ emissions

	Average Price	Average Duration	CO₂ emissions
Bus	Average Price$30 - $67	Average Duration6h 10m	CO₂ emissions 7kg CO₂e
Train	Average Price$76 - $236	Average Duration3h 51m	CO₂ emissions 7kg CO₂e
Carpool	Average Price$43 - $43	Average Duration3h 50m	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 WiFi. Great Western Railway ticket prices on this trip start at $76

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

Frequently asked questions about travelling from Carmarthen to London by train

How much does a cheap train ticket from Carmarthen to London cost?
The average train ticket price from Carmarthen to London is $131. The best way to find cheap train tickets from Carmarthen to London 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 trip from Carmarthen to London?
A train trip between Carmarthen and London is around 3h 51m, although the fastest train will take about 3h 39m. This is the time it takes to travel the 292 km that separates the two cities.
How many daily trains are there between Carmarthen and London?
The number of trains from Carmarthen to London can differ depending on the day of the week. On average, there are 4. Some trains are direct while others include transferring trains. Simplify your train trip from Carmarthen to London by comparing and selecting the train that fits your travel style and budget on Busbud.
Which train companies travel from Carmarthen to London?
When taking the train from Carmarthen to London, you can travel comfortably and safely with Great Western Railway.

Find cheapest prices for trains

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

Best price found

11-13

$89

11-14

$120

Today

$120

11-16

$128

11-17

$73

11-18

$73

11-19

$73

11-20

$112

The cheapest trip from Carmarthen to London was searched and found on Nov 17, 2025 with a price of $73

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 $73 to $471 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 $73 which is on 2025-11-17.