Carmarthen to Watford Junction Trains

Carmarthen to Watford Junction trains

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Trip Overview

The average train between Carmarthen and Watford Junction takes 4h 51m and the fastest train takes 4h 37m. The train service runs several times per day from Carmarthen to Watford Junction. 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 51m
Duration: 237 mi
Distance: £135
Average price: Every 4 hours
Frequency

Train

best

Take the train from Carmarthen to London Paddingtontrain Carmarthen - London Paddington / ...

4h 38m

£111–237

Carmarthen to Watford Junction train times

Trains run every 4 hours between Carmarthen and Watford Junction. The earliest departure is at 7:23 AM in the morning, and the last departure from Carmarthen is at 7:20 PM which arrives into Watford Junction at 12:47 AM. All services require a transfer at London Paddington and take an average of 4h 51m. The schedules shown below are for the next available departures.

Departing Friday, August 14, 2026

7:23 AM → 12:12 PM
4h 49m • 2 changes
9:21 AM → 2:12 PM
4h 51m • 2 changes
11:27 AM → 4:12 PM
4h 45m • 2 changes
2:20 PM → 7:13 PM
4h 53m • 2 changes
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Departing Saturday, August 15, 2026

7:24 AM → 12:12 PM
4h 48m • 2 changes
9:30 AM → 2:12 PM
4h 42m • 2 changes
11:30 AM → 4:12 PM
4h 42m • 2 changes
1:30 PM → 6:12 PM
4h 42m • 2 changes
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Departing Sunday, August 16, 2026

11:25 AM → 4:11 PM
4h 46m • 2 changes
2:15 PM → 7:11 PM
4h 56m • 2 changes
4:30 PM → 9:18 PM
4h 48m • 2 changes
7:20 PM → 12:47 AM
Arrives next day
5h 27m • 2 changes

Departing Monday, August 17, 2026

7:23 AM → 12:12 PM
4h 49m • 2 changes
9:21 AM → 2:12 PM
4h 51m • 2 changes
11:27 AM → 4:12 PM
4h 45m • 2 changes
2:20 PM → 7:13 PM
4h 53m • 2 changes
Show more

Departing Tuesday, August 18, 2026

7:23 AM → 12:12 PM
4h 49m • 2 changes
9:21 AM → 2:12 PM
4h 51m • 2 changes
11:27 AM → 4:12 PM
4h 45m • 2 changes
2:20 PM → 7:13 PM
4h 53m • 2 changes
Show more

Departing Wednesday, August 19, 2026

7:23 AM → 12:12 PM
4h 49m • 2 changes
9:21 AM → 2:12 PM
4h 51m • 2 changes
11:27 AM → 4:12 PM
4h 45m • 2 changes
2:20 PM → 7:13 PM
4h 53m • 2 changes
Show more

Departing Thursday, August 20, 2026

7:23 AM → 12:12 PM
4h 49m • 2 changes
9:21 AM → 2:12 PM
4h 51m • 2 changes
11:27 AM → 4:12 PM
4h 45m • 2 changes
2:20 PM → 7:13 PM
4h 53m • 2 changes
Show more

Frequently asked questions

Want to know about travelling from Carmarthen to Watford Junction? 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.