What is the average petrol price in Carmarthen?

The average unleaded (E10) petrol price in Carmarthen is currently 158.3p per litre (approx. £7.20/gal), based on live data from 7 forecourts reporting this grade. Prices are updated every 30 minutes from official UK government data.

What is the average diesel price in Carmarthen?

The average diesel (B7) price in Carmarthen is currently 176.3p per litre (approx. £8.01/gal). This is based on live data from forecourts in the area, updated every 30 minutes.

Which is the cheapest petrol station in Carmarthen?

MURCO at DERWYDD GARAGE, CYNWYL ELFED, CARMARTHEN, SA33 6TP, CARMARTHEN currently has the cheapest reported unleaded petrol in Carmarthen at 156.9p per litre (approx. £7.13/gal). Prices change regularly, so check this page for the latest.

Which is the most expensive petrol station in Carmarthen?

According to official UK government fuel price data, MORRISONS (SA31 2NF) currently has the highest reported unleaded (E10) price in Carmarthen at 159.9p per litre (approx. £7.27/gal). Prices are refreshed every 30 minutes, so this can change through the day.

How do I find the cheapest fuel near Carmarthen?

Use the search box above to enter your postcode. fuel.co.uk will show you every forecourt ranked cheapest first, with live prices updated every 30 minutes from the GOV.UK Fuel Finder.

Live prices

Cheapest petrol and diesel prices in Carmarthen

7 forecourts tracked in Carmarthen (7 reporting unleaded (E10), 7 reporting diesel (B7), 5 reporting premium (E5), 3 reporting super diesel). Prices last refreshed at 6:31pm on 30 July 2026.

The cheapest reported unleaded petrol (E10) in Carmarthen is 156.9p per litre at MURCO, DERWYDD GARAGE, CYNWYL ELFED, CARMARTHEN, SA33 6TP, CARMARTHEN. The average across 7 forecourts currently reporting this grade is 158.3p per litre, so choosing the cheapest rather than an average-priced forecourt saves about £0.70 on a 50-litre fill. That local average is 1.5p per litre below the UK average of 159.8p.

The average has risen 0.1p per litre since yesterday. The average has risen 4.1p per litre since last week.

Prices last refreshed at 6:31pm on 30 July 2026, supplied through the official UK Government fuel price open data scheme and checked every 30 minutes.

Unleaded Prices

Unleaded (E10)

Highest: 159.9p/lapprox. £7.27/gal
Average: 158.3p/lapprox. £7.20/gal
Lowest: 156.9p/lapprox. £7.13/gal

Diesel Prices

Diesel (B7)

Highest: 179.9p/lapprox. £8.18/gal
Average: 176.3p/lapprox. £8.01/gal
Lowest: 172.9p/lapprox. £7.86/gal

Premium Unleaded Prices

Premium Unleaded (E5)

Highest: 162.5p/lapprox. £7.39/gal
Average: 171.9p/lapprox. £7.81/gal
Lowest: 162.5p/lapprox. £7.39/gal

Super Diesel Prices

Super Diesel (SDV)

Highest: 177.5p/lapprox. £8.07/gal
Average: 190.0p/lapprox. £8.64/gal
Lowest: 177.5p/lapprox. £8.07/gal

All forecourts in Carmarthen

Sort by

Cheapest unleaded e10

MURCO

DERWYDD GARAGE, CYNWYL ELFED, CARMARTHEN, SA33 6TP, CARMARTHEN · SA33 6TP

Usually cheapest midnight to 5am, priciest 7pm to midnight here

Directions

156.9p/L

approx. £7.13/gal

Diesel B7

174.9p

approx. £7.95/gal

Premium E5

166.9p

approx. £7.59/gal

MURCO

C K'S SUPERMARKET, OLD ST. CLEARS ROAD, JOHNSTOWN, CARMARTHEN · SA31 3HL

Usually cheapest 3am to 8am, priciest 7pm to midnight here

Directions

156.9p/L

approx. £7.13/gal

Diesel B7

176.9p

approx. £8.04/gal

MURCO

GWALIA GARAGE, RHYDARGAEAU, CARMARTHEN · SA32 7DR

Usually cheapest midnight to 5am, priciest 1pm to 6pm here

Directions

156.9p/L

approx. £7.13/gal

Diesel B7

173.9p

approx. £7.91/gal

Premium E5

162.5p

approx. £7.39/gal

Super Diesel

177.5p

approx. £8.07/gal

MURCO

TANERDY GARAGE, TANERDY , CARMARTHEN · SA31 2EY

Usually cheapest midnight to 5am, priciest 6pm to 11pm here

Directions

157.9p/L

approx. £7.18/gal

Diesel B7

172.9p

approx. £7.86/gal

Premium E5

162.5p

approx. £7.39/gal

Super Diesel

177.5p

approx. £8.07/gal

VALERO

LYSONNEN ROAD, CARMARTHEN, CARMARTHEN, CARMARTHENSHIRE · SA33 5DT

Usually cheapest midnight to 5am, priciest noon to 5pm here

Directions

159.9p/L

approx. £7.27/gal

Diesel B7

179.9p

approx. £8.18/gal

Premium E5

191.9p

approx. £8.72/gal

Super Diesel

214.9p

approx. £9.77/gal

ESSO

A40, CARMARTHEN, CARMARTHEN · SA32 7EN

Usually cheapest 4am to 9am, priciest 9pm to midnight here

Directions

159.9p/L

approx. £7.27/gal

Diesel B7

179.9p

approx. £8.18/gal

MORRISONS

PARC PENSARN, CARMARTHEN, CARMARTHENSHIRE · SA31 2NF

Directions

159.9p/L

approx. £7.27/gal

Diesel B7

175.9p

approx. £8.00/gal

Premium E5

175.9p

approx. £8.00/gal

Search near Carmarthen

Ask the fuel analyst

Answers come straight from recorded official price data, refreshed every 30 minutes.

Cheapest reported unleaded

MURCO

DERWYDD GARAGE, CYNWYL ELFED, CARMARTHEN, SA33 6TP, CARMARTHEN

156.9p/L

Cheapest reported diesel

MURCO

TANERDY GARAGE, TANERDY , CARMARTHEN

172.9p/L

By fuel grade in Carmarthen

Cheapest unleaded petrol (E10) in Carmarthen Cheapest diesel (B7) in Carmarthen Cheapest premium unleaded (E5) in Carmarthen Cheapest super diesel in Carmarthen 24-hour petrol stations in Carmarthen

Nearby areas

Petrol prices in Caerfyrddin Petrol prices in Llanelli Petrol prices in Llandysul Petrol prices in Abertawe Petrol prices in Narberth Petrol prices in Cardigan Petrol prices in Swansea

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Prices are sourced from official UK government fuel-price data (Open Government Licence v3.0). Updated every 30 minutes.

Questions about fuel prices in Carmarthen

What is the average petrol price in Carmarthen?: The average unleaded (E10) petrol price in Carmarthen is currently 158.3p per litre (approx. £7.20/gal), based on live data from 7 forecourts reporting this grade. Prices are updated every 30 minutes from official UK government data.
What is the average diesel price in Carmarthen?: The average diesel (B7) price in Carmarthen is currently 176.3p per litre (approx. £8.01/gal). This is based on live data from forecourts in the area, updated every 30 minutes.
Which is the cheapest petrol station in Carmarthen?: MURCO at DERWYDD GARAGE, CYNWYL ELFED, CARMARTHEN, SA33 6TP, CARMARTHEN currently has the cheapest reported unleaded petrol in Carmarthen at 156.9p per litre (approx. £7.13/gal). Prices change regularly, so check this page for the latest.
Which is the most expensive petrol station in Carmarthen?: According to official UK government fuel price data, MORRISONS (SA31 2NF) currently has the highest reported unleaded (E10) price in Carmarthen at 159.9p per litre (approx. £7.27/gal). Prices are refreshed every 30 minutes, so this can change through the day.
How do I find the cheapest fuel near Carmarthen?: Use the search box above to enter your postcode. fuel.co.uk will show you every forecourt ranked cheapest first, with live prices updated every 30 minutes from the GOV.UK Fuel Finder.