Harpenden to Carmarthen Trains

Harpenden to Carmarthen trains

Travel from

Search accommodation with Expedia

Trip Overview

The average train between Harpenden and Carmarthen takes 4h 55m and the fastest train takes 4h 28m. There is a train service every few hours from Harpenden to Carmarthen. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.

4h 55m
Duration: 250 mi
Distance: £129
Average price: Hourly
Frequency

Train via Swansea

best

Take the train from Harpenden to Farringdontrain
Take the train from London Paddington to Swanseatrain
Take the train from Swansea to Carmarthentrain

5h 14m

£106–197

Harpenden to Carmarthen train times

Trains run hourly between Harpenden and Carmarthen. The earliest departure is at 12:12 AM at night, and the last departure from Harpenden is at 9:52 PM which arrives into Carmarthen at 6:46 AM. All services require a transfer at Farringdon and take an average of 4h 55m. The schedules shown below are for the next available departures.

Departing Thursday, October 15, 2026

7:52 PM → 1:38 AM
Arrives next day
5h 46m • 3 changes

Departing Friday, October 16, 2026

5:52 AM → 10:30 AM
4h 38m • 3 changes
6:58 AM → 11:45 AM
4h 47m • 3 changes
7:58 AM → 12:36 PM
4h 38m • 3 changes
8:52 AM → 1:26 PM
4h 34m • 3 changes
Show more

Departing Saturday, October 17, 2026

5:52 AM → 10:25 AM
4h 33m • 3 changes
6:52 AM → 11:49 AM
4h 57m • 3 changes
7:52 AM → 12:27 PM
4h 35m • 3 changes
8:52 AM → 1:48 PM
4h 56m • 3 changes
Show more

Departing Sunday, October 18, 2026

12:12 AM → 1:05 PM
12h 53m • 3 changes
9:52 AM → 2:50 PM
4h 58m • 3 changes
10:52 AM → 3:20 PM
4h 28m • 3 changes
12:52 PM → 5:25 PM
4h 33m • 3 changes
Show more

Departing Monday, October 19, 2026

5:52 AM → 10:30 AM
4h 38m • 3 changes
6:58 AM → 11:45 AM
4h 47m • 3 changes
7:58 AM → 12:36 PM
4h 38m • 3 changes
8:52 AM → 1:26 PM
4h 34m • 3 changes
Show more

Frequently asked questions

Want to know about travelling from Harpenden to Carmarthen? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.