Carmarthen to Heathrow Terminal 4 Trains

Carmarthen to Heathrow Terminal 4 trains

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Trip Overview

The average train between Carmarthen and Heathrow Terminal 4 takes 5h 6m and the fastest train takes 4h 20m. There is a train service every few hours from Carmarthen to Heathrow Terminal 4. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.

5h 6m
Duration: 218 mi
Distance: £115
Average price: Hourly
Frequency

Train via Reading

best

Take the train from Carmarthen to Readingtrain Carmarthen - London Paddington / ...
Take the train from Reading to Felthamtrain Reading - London Waterloo

5h 1m

£97–187

Carmarthen to Heathrow Terminal 4 train times

Trains run hourly between Carmarthen and Heathrow Terminal 4. The earliest departure is at 4:37 AM at night, and the last departure from Carmarthen is at 10:41 PM which arrives into Heathrow Terminal 4 at 7:57 AM. All services require a transfer at Reading and take an average of 5h 6m. The schedules shown below are for the next available departures.

Departing Saturday, August 15, 2026

5:28 AM → 9:57 AM
4h 29m • 2 changes
6:53 AM → 11:27 AM
4h 33m • 2 changes
7:24 AM → 11:57 AM
4h 33m • 2 changes
8:30 AM → 12:57 PM
4h 27m • 2 changes
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Departing Sunday, August 16, 2026

8:51 AM → 1:57 PM
5h 6m • 2 changes
10:22 AM → 2:57 PM
4h 35m • 2 changes
11:25 AM → 3:57 PM
4h 32m • 2 changes
11:59 AM → 4:57 PM
4h 58m • 2 changes
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Departing Monday, August 17, 2026

4:37 AM → 8:57 AM
4h 20m • 2 changes
5:32 AM → 9:57 AM
4h 25m • 2 changes
6:52 AM → 11:27 AM
4h 35m • 2 changes
7:23 AM → 11:57 AM
4h 34m • 2 changes
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Departing Tuesday, August 18, 2026

4:37 AM → 8:57 AM
4h 20m • 2 changes
5:34 AM → 9:57 AM
4h 23m • 2 changes
6:52 AM → 11:27 AM
4h 35m • 2 changes
7:23 AM → 11:57 AM
4h 34m • 2 changes
Show more

Frequently asked questions

Want to know about travelling from Carmarthen to Heathrow Terminal 4? 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.