How much is the train ticket from London to Carmarthen?

The cheapest train tickets from London to Carmarthen start from $48. The average price for this train route is around $122. Busbud recommends that you book your tickets in advance for a better chance to get the lowest possible price.

How long is the train journey from London to Carmarthen?

The average train ride duration from London to Carmarthen is 3h 42m, covering a distance of 178 miles (288 km). The quickest train can get you there in 3h 35m and is operated by Great Western Railway .

Which train operators service the London to Carmarthen route?

Several major train operators operate on this route with 3 trains available per day.

What is the earliest and latest departure time for the train from London to Carmarthen?

The earliest train departs from London to Carmarthen at 7:31am. And the latest train departs at 5:48pm.

Train London to Carmarthen from $45

Next train departures

Next departures for London to Carmarthen on January 31
Vehicle type	Departure time	Departure location	Trip duration	Arrival time	Arrival location	Recommended
Train	7:48am	London Paddington	4h 38m	12:26pm	Carmarthen	Cheapest
Train	4:48pm	London Paddington	4h 15m	9:03pm	Carmarthen	Fastest
Train	7:48am	London Paddington	4h 38m	12:26pm	Carmarthen	No tags
Train	9:48am	London Paddington	4h 38m	2:26pm	Carmarthen	No tags
Train	9:48am	London Paddington	4h 38m	2:26pm	Carmarthen	No tags

Next departures for London to Carmarthen on February 1
Vehicle type	Departure time	Departure location	Trip duration	Arrival time	Arrival location	Recommended
Train	10:43am	London Paddington	4h 37m	3:20pm	Carmarthen	CheapestFastest
Train	10:43am	London Paddington	4h 37m	3:20pm	Carmarthen	No tags
Train	12:43pm	London Paddington	4h 42m	5:25pm	Carmarthen	No tags
Train	12:43pm	London Paddington	4h 42m	5:25pm	Carmarthen	No tags

Last refresh of the prices: Today at 10:12 AM GMT.

Compare 3 ways to go from London to Carmarthen

We recommend carpooling

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 $41, 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 - $54	Average Duration5h 45m	CO₂ emissions 7kg CO₂e
Train	Average Price$48 - $244	Average Duration3h 42m	CO₂ emissions 7kg CO₂e
Carpool	Average Price$41 - $41	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 $48

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

Frequently asked questions about traveling from London to Carmarthen by train

Please note that schedules, routes, or operator details shown here may be updated or vary at the time of your trip.

How much is the train ticket from London to Carmarthen?
The cheapest train tickets from London to Carmarthen start from $48. The average price for this train route is around $122. Busbud recommends that you book your tickets in advance for a better chance to get the lowest possible price.
How long is the train journey from London to Carmarthen?
The average train ride duration from London to Carmarthen is 3h 42m, covering a distance of 178 miles (288 km). The quickest train can get you there in 3h 35m and is operated by Great Western Railway.
Which train operators service the London to Carmarthen route?
Several major train operators operate on this route with 3 trains available per day.
What is the earliest and latest departure time for the train from London to Carmarthen?
The earliest train departs from London to Carmarthen at 7:31am. And the latest train departs at 5:48pm.

Find cheapest prices for trains

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

Best price found

01/28

No data

01/29

No data

Today

No data

01/31

$88

02/01

$92

02/02

No data

02/03

No data

02/04

No data

The cheapest trip from London to Carmarthen was searched and found on Jan 31, 2026 with a price of $88

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 $88 to $148 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 $88 which is on 2026-01-31.