Heathrow Terminal 4 to Carmarthen Trains

Heathrow Terminal 4 to Carmarthen trains

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Trip Overview

The average train between Heathrow Terminal 4 and Carmarthen takes 4h 44m and the fastest train takes 4h 20m. There is a train service every few hours from Heathrow Terminal 4 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 44m
Duration: 238 mi
Distance: £126
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 5m

£103–198

Heathrow Terminal 4 to Carmarthen train times

Trains run hourly between Heathrow Terminal 4 and Carmarthen. The earliest departure is at 6:00 AM in the morning, and the last departure from Heathrow Terminal 4 is at 10:00 PM which arrives into Carmarthen at 6:47 AM. All services require a transfer at London Paddington and take an average of 4h 44m. The schedules shown below are for the next available departures.

Departing Wednesday, October 28, 2026

11:00 AM → 3:28 PM
4h 28m • 2 changes
12:00 PM → 4:29 PM
4h 29m • 2 changes
1:00 PM → 5:21 PM
4h 21m • 2 changes
2:00 PM → 6:27 PM
4h 27m • 2 changes
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Departing Thursday, October 29, 2026

6:00 AM → 10:30 AM
4h 30m • 2 changes
7:00 AM → 11:45 AM
4h 45m • 2 changes
8:00 AM → 12:36 PM
4h 36m • 2 changes
9:00 AM → 1:26 PM
4h 26m • 2 changes
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Departing Friday, October 30, 2026

6:00 AM → 10:30 AM
4h 30m • 2 changes
7:00 AM → 11:45 AM
4h 45m • 2 changes
8:00 AM → 12:36 PM
4h 36m • 2 changes
9:00 AM → 1:26 PM
4h 26m • 2 changes
Show more

Departing Saturday, October 31, 2026

6:00 AM → 10:25 AM
4h 25m • 2 changes
7:00 AM → 11:49 AM
4h 49m • 2 changes
8:00 AM → 12:27 PM
4h 27m • 2 changes
9:00 AM → 1:48 PM
4h 48m • 2 changes
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Departing Sunday, November 1, 2026

7:03 AM → 1:05 PM
6h 2m • 2 changes
10:00 AM → 2:50 PM
4h 50m • 2 changes
11:00 AM → 3:20 PM
4h 20m • 2 changes
1:00 PM → 5:25 PM
4h 25m • 2 changes
Show more

Departing Monday, November 2, 2026

6:00 AM → 10:30 AM
4h 30m • 2 changes
7:00 AM → 11:45 AM
4h 45m • 2 changes
8:00 AM → 12:36 PM
4h 36m • 2 changes
9:00 AM → 1:26 PM
4h 26m • 2 changes
Show more

Departing Tuesday, November 3, 2026

6:00 AM → 10:30 AM
4h 30m • 2 changes
7:00 AM → 11:45 AM
4h 45m • 2 changes
8:00 AM → 12:36 PM
4h 36m • 2 changes
9:00 AM → 1:26 PM
4h 26m • 2 changes
Show more

Frequently asked questions

Want to know about travelling from Heathrow Terminal 4 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.