Carmarthen to Heathrow Trains

Carmarthen to Heathrow trains

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Trip Overview

The average train between Carmarthen and Heathrow takes 4h 43m and the fastest train takes 4h 2m. There is a train service every few hours from Carmarthen to Heathrow. 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 43m
Duration: 235 mi
Distance: £134
Average price: Hourly
Frequency

Train

best

Take the train from Carmarthen to Swanseatrain Carmarthen - Cardiff Central / ...
Take the train from Swansea to London Paddingtontrain Swansea - London Paddington / ...

4h 37m

£102–209

Carmarthen to Heathrow train times

Trains run hourly between Carmarthen and Heathrow. The earliest departure is at 4:37 AM at night, and the last departure from Carmarthen is at 10:43 PM which arrives into Heathrow at 7:39 AM. All services require a transfer at Swansea and take an average of 4h 43m. The schedules shown below are for the next available departures.

Departing Tuesday, October 27, 2026

6:52 AM → 10:54 AM
4h 2m • 2 changes
7:23 AM → 11:39 AM
4h 16m • 2 changes
8:30 AM → 12:39 PM
4h 9m • 2 changes
9:21 AM → 1:39 PM
4h 18m • 2 changes
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Departing Wednesday, October 28, 2026

4:37 AM → 8:39 AM
4h 2m • 2 changes
5:32 AM → 9:39 AM
4h 7m • 2 changes
6:52 AM → 10:54 AM
4h 2m • 2 changes
7:23 AM → 11:39 AM
4h 16m • 2 changes
Show more

Departing Thursday, October 29, 2026

4:37 AM → 8:39 AM
4h 2m • 2 changes
5:32 AM → 9:39 AM
4h 7m • 2 changes
6:52 AM → 10:54 AM
4h 2m • 2 changes
7:23 AM → 11:39 AM
4h 16m • 2 changes
Show more

Departing Friday, October 30, 2026

4:37 AM → 8:39 AM
4h 2m • 2 changes
5:32 AM → 9:39 AM
4h 7m • 2 changes
6:52 AM → 10:54 AM
4h 2m • 2 changes
7:23 AM → 11:39 AM
4h 16m • 2 changes
Show more

Departing Saturday, October 31, 2026

4:37 AM → 8:39 AM
4h 2m • 2 changes
5:28 AM → 9:39 AM
4h 11m • 2 changes
6:53 AM → 11:09 AM
4h 16m • 2 changes
7:24 AM → 11:39 AM
4h 15m • 2 changes
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Departing Sunday, November 1, 2026

9:34 AM → 1:41 PM
4h 7m • 2 changes
10:34 AM → 2:39 PM
4h 5m • 2 changes
11:25 AM → 3:41 PM
4h 16m • 2 changes
12:31 PM → 4:40 PM
4h 9m • 2 changes
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Departing Monday, November 2, 2026

4:37 AM → 8:39 AM
4h 2m • 2 changes
5:32 AM → 9:39 AM
4h 7m • 2 changes
6:52 AM → 10:54 AM
4h 2m • 2 changes
7:23 AM → 11:39 AM
4h 16m • 2 changes
Show more

Frequently asked questions

Want to know about travelling from Carmarthen to Heathrow? 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.