Carmarthen to Heathrow Trains

Carmarthen to Heathrow trains

Travel from

Search accommodation with Expedia

Trip Overview

The average train between Carmarthen and Heathrow takes 4h 44m 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 44m
Duration: 235 mi
Distance: £134
Average price: Hourly
Frequency

Train

best

Take the train from Carmarthen to Swanseatrain Milford Haven - Shrewsbury / ...
Take the train from Swansea to London Paddingtontrain Swansea - London Paddington / ...

4h 41m

£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 44m. The schedules shown below are for the next available departures.

Departing Sunday, November 1, 2026

10:34 PM → 7:39 AM
Arrives next day
9h 5m • 2 changes

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

Departing Tuesday, November 3, 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 Wednesday, November 4, 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, November 5, 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, November 6, 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, November 7, 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
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.