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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

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, November 10, 2026

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    Great Western Railway (GWR)Great Western Railway (GWR)Heathrow Express4h 19m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 44m • 2 changes
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    Arrives next day

    Transport for WalesGreat Western Railway (GWR)Heathrow Express8h 58m • 2 changes

Departing Wednesday, November 11, 2026

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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 2m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 7m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 36m • 2 changes
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    Great Western Railway (GWR)Great Western Railway (GWR)Heathrow Express4h 26m • 2 changes
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Departing Thursday, November 12, 2026

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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 2m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 7m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 36m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 2m • 2 changes
  • Show more

Departing Friday, November 13, 2026

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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 2m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 7m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 36m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 2m • 2 changes
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Departing Saturday, November 14, 2026

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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 2m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 11m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 16m • 2 changes
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    Great Western Railway (GWR)Great Western Railway (GWR)Heathrow Express4h 15m • 2 changes
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Departing Sunday, November 15, 2026

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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 7m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 5m • 2 changes
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    Great Western Railway (GWR)Great Western Railway (GWR)Heathrow Express4h 16m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 9m • 2 changes
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Departing Monday, November 16, 2026

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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 2m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 7m • 2 changes
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    Transport for WalesGreat Western Railway (GWR)Heathrow Express4h 2m • 2 changes
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    Great Western Railway (GWR)Great Western Railway (GWR)Heathrow Express4h 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.

Map of how to get from Carmarthen to Heathrow.ExpandLaunch map view
  • Distance: 235.5 mi
  • Duration: 4h 43m

What companies run services between Carmarthen, Wales and Heathrow, England?

You can take a train from Carmarthen to Heathrow Terminals 2 & 3 via Swansea and London Paddington in around 4h 41m.

Operators