Watford Junction to Carmarthen Trains

Watford Junction to Carmarthen trains

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Trip Overview

The average train between Watford Junction and Carmarthen takes 4h 55m and the fastest train takes 4h 25m. There is a train service every few hours from Watford Junction 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: 237 mi
Distance: £122
Average price: Hourly
Frequency

Train via Swansea

best

Take the train from London Paddington to Swanseatrain London Paddington - Swansea / ...
Take the train from Swansea to Carmarthentrain Bristol Temple Meads - Milford Haven / ...

5h 18m

£93–189

Watford Junction to Carmarthen train times

Trains run hourly between Watford Junction and Carmarthen. The earliest departure is at 5:57 AM in the morning, and the last departure from Watford Junction is at 9:51 PM which arrives into Carmarthen at 6:47 AM. All services require a transfer at Harrow & Wealdstone and take an average of 4h 55m. The schedules shown below are for the next available departures.

Departing Monday, November 2, 2026

9:52 AM → 2:30 PM
4h 38m • 3 changes
10:52 AM → 3:28 PM
4h 36m • 3 changes
11:52 AM → 4:29 PM
4h 37m • 3 changes
12:56 PM → 5:21 PM
4h 25m • 3 changes
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Departing Tuesday, November 3, 2026

5:59 AM → 10:30 AM
4h 31m • 3 changes
6:52 AM → 11:45 AM
4h 53m • 3 changes
8:02 AM → 12:36 PM
4h 34m • 3 changes
8:52 AM → 1:26 PM
4h 34m • 3 changes
Show more

Departing Wednesday, November 4, 2026

5:59 AM → 10:30 AM
4h 31m • 3 changes
6:52 AM → 11:45 AM
4h 53m • 3 changes
8:02 AM → 12:36 PM
4h 34m • 3 changes
8:52 AM → 1:26 PM
4h 34m • 3 changes
Show more

Departing Thursday, November 5, 2026

5:59 AM → 10:30 AM
4h 31m • 3 changes
6:52 AM → 11:45 AM
4h 53m • 3 changes
8:02 AM → 12:36 PM
4h 34m • 3 changes
8:52 AM → 1:26 PM
4h 34m • 3 changes
Show more

Departing Friday, November 6, 2026

5:59 AM → 10:30 AM
4h 31m • 3 changes
6:52 AM → 11:45 AM
4h 53m • 3 changes
8:02 AM → 12:36 PM
4h 34m • 3 changes
8:52 AM → 1:26 PM
4h 34m • 3 changes
Show more

Departing Saturday, November 7, 2026

5:57 AM → 10:25 AM
4h 28m • 3 changes
6:55 AM → 11:49 AM
4h 54m • 3 changes
7:52 AM → 12:27 PM
4h 35m • 3 changes
8:52 AM → 1:48 PM
4h 56m • 3 changes
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Departing Sunday, November 8, 2026

7:22 AM → 1:05 PM
5h 43m • 3 changes
8:19 AM → 1:16 PM
4h 57m • 3 changes
9:48 AM → 2:50 PM
5h 2m • 3 changes
10:45 AM → 3:20 PM
4h 35m • 3 changes
Show more

Frequently asked questions

Want to know about travelling from Watford Junction 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.