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 54m 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 54m

Duration

237 mi

Distance

£122

Average price

Hourly

Frequency

Watford Junction to Carmarthen train times

Trains run hourly between Watford Junction and Carmarthen. The earliest departure is at 5:59 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 54m. The schedules shown below are for the next available departures.

Departing Sunday, October 11, 2026

8:55 PM → 6:47 AM
Arrives next day
9h 52m • 3 changes

Departing Monday, October 12, 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 Tuesday, October 13, 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, October 14, 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

Phone: +44 (0)345 7000 125
Email: [email protected]
Website: Great Western Railway (GWR)

Train from London Paddington to Swansea

Ave. Duration: 2h 47m
Frequency: Hourly
Estimated price: £80–150
Website: Great Western Railway (GWR)

Train from Swansea to Carmarthen

Ave. Duration: 45 min
Frequency: Every 4 hours
Estimated price: £13–24
Website: Great Western Railway (GWR)

Train from London Paddington to Carmarthen

Ave. Duration: 3h 40m
Frequency: Every 4 hours
Estimated price: £90–170
Website: Great Western Railway (GWR)

Train Exterior

IRJ

Ticket office

Pentagram

Standard class

Pentagram

External view

Wikimedia Commons

1st Class Seat

GWR

1st Class Seat

GWR

Watford Junction to Carmarthen trains

Trip Overview

Train via Swansea