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Boston to Carmarthen trains

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Trip Overview

The average train between Boston and Carmarthen takes 8h 7m and the fastest train takes 6h 27m. The train service runs several times per day from Boston 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.

8h 7m
Duration
363 mi
Distance
£167
Average price
Every 3 hours
Frequency

Train via London

best
  1. Take the train from Boston to Granthamtrain train
  2. Take the train from Grantham to King's Crosstrain train
  3. Take the train from London Paddington to Swanseatrain train
  4. Take the train from Swansea to Carmarthentrain train
6h 57m
£128–248

Boston to Carmarthen train times

Trains run every 3 hours between Boston and Carmarthen. The earliest departure is at 6:13 AM in the morning, and the last departure from Boston is at 9:54 PM which arrives into Carmarthen at 3:20 PM. All services require a transfer at Grantham and take an average of 8h 7m. The schedules shown below are for the next available departures.

Departing Friday, October 9, 2026

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    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 40m • 4 changes

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    East Midlands RailwaysLondon North Eastern Railway Limited (LNER)London Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)6h 47m • 4 changes

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    East Midlands RailwaysLondon North Eastern Railway Limited (LNER)London Underground (Tube)Great Western Railway (GWR)Transport for Wales7h 6m • 4 changes

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    Arrives next day

    East Midlands RailwaysLondon North Eastern Railway Limited (LNER)London Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 37m • 4 changes
  • Show more

Departing Saturday, October 10, 2026

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    East Midlands RailwaysLondon North Eastern Railway Limited (LNER)London Underground (Tube)Great Western Railway (GWR)Transport for Wales7h 35m • 4 changes

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    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 54m • 4 changes

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    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 57m • 4 changes

  •  → 

    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 35m • 4 changes
  • Show more

Departing Sunday, October 11, 2026

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    East Midlands RailwaysLondon North Eastern Railway Limited (LNER)London Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)6h 31m • 4 changes

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    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 41m • 4 changes

  •  → 

    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 57m • 4 changes

  •  → 

    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 47m • 4 changes
  • Show more

Departing Monday, October 12, 2026

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    East Midlands RailwaysLondon North Eastern Railway Limited (LNER)London Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)7h 13m • 4 changes

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    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)6h 35m • 4 changes

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    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)6h 27m • 4 changes

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    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 40m • 4 changes
  • Show more

Departing Tuesday, October 13, 2026

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    East Midlands RailwaysLondon North Eastern Railway Limited (LNER)London Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)7h 13m • 4 changes

  •  → 

    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)6h 35m • 4 changes

  •  → 

    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)6h 27m • 4 changes

  •  → 

    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 40m • 4 changes
  • Show more

Departing Wednesday, October 14, 2026

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    East Midlands RailwaysLondon North Eastern Railway Limited (LNER)London Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)7h 13m • 4 changes

  •  → 

    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)6h 35m • 4 changes

  •  → 

    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)6h 27m • 4 changes

  •  → 

    East Midlands RailwaysHull TrainsLondon Underground (Tube)Great Western Railway (GWR)Transport for Wales6h 40m • 4 changes
  • Show more

Departing Thursday, October 15, 2026

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    East Midlands RailwaysLondon North Eastern Railway Limited (LNER)London Underground (Tube)Great Western Railway (GWR)Great Western Railway (GWR)7h 13m • 4 changes

Frequently asked questions

Want to know about travelling from Boston 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.

Map of how to get from Boston to Carmarthen.ExpandLaunch map view
  • Distance: 362.9 mi
  • Duration: 8h 7m

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

You can take a train from Boston to Carmarthen via Grantham, London Kings Cross, King's Cross St. Pancras station, Paddington, London Paddington, and Swansea in around 6h 57m.

Operators