Fuel prices
Petrol and diesel prices in Carmarthen
Compare 7 stations and find the cheapest fuel in Carmarthen today.
In Carmarthen, unleaded petrol (E10) averages 167.9p per litre and standard diesel averages 195.9p per litre. The cheapest unleaded is at MURCO for 165.9p per litre. Prices updated 4 November 2026, 18:34.
Average fuel prices in Carmarthen
Unleaded
167.9p/L
Lowest 165.9p · UK avg 171.0p
Diesel
195.9p/L
Lowest 193.9p · UK avg 198.4p
Super unleaded
186.1p/L
Lowest 178.5p · UK avg 190.0p
Premium diesel
210.6p/L
Lowest 205.5p · UK avg 217.7p
Latest price update in Carmarthen: 4 Nov 2026, 18:34. Source: GOV.UK Fuel Finder.
Cheapest unleaded in Carmarthen
-
MURCO Cheapest
GWALIA GARAGE, CARMARTHEN, SA32 7DR
165.9p
-
MURCO
TANERDY GARAGE, CARMARTHEN, SA31 2EY
165.9p
-
Murco
DERWYDD GARAGE, CARMARTHEN, SA33 6TP
166.9p
-
MORRISONS
PARC PENSARN, CARMARTHEN, SA31 2NF
167.9p
-
VALERO
LYSONNEN ROAD, CARMARTHEN, SA33 5DT
167.9p
-
Murco
C K'S SUPERMARKET, CARMARTHEN, SA31 3HL
168.9p
-
ESSO
A40, CARMARTHEN, CARMARTHEN, SA32 7EN
171.9p
Cheapest diesel in Carmarthen
-
MURCO Cheapest
GWALIA GARAGE, CARMARTHEN, SA32 7DR
193.9p
-
MURCO
TANERDY GARAGE, CARMARTHEN, SA31 2EY
193.9p
-
MORRISONS
PARC PENSARN, CARMARTHEN, SA31 2NF
194.9p
-
Murco
DERWYDD GARAGE, CARMARTHEN, SA33 6TP
195.9p
-
VALERO
LYSONNEN ROAD, CARMARTHEN, SA33 5DT
196.9p
-
Murco
C K'S SUPERMARKET, CARMARTHEN, SA31 3HL
196.9p
-
ESSO
A40, CARMARTHEN, CARMARTHEN, SA32 7EN
198.9p
Fuel prices in Carmarthen: FAQ
What is the average price of petrol in Carmarthen?
Unleaded (E10) in Carmarthen averages 167.9p per litre across 7 stations, ranging from 165.9p to 171.9p. That is 3.1p below the UK average.
What is the average price of diesel in Carmarthen?
Standard diesel in Carmarthen averages 195.9p per litre across 7 stations, ranging from 193.9p to 198.9p. That is 2.5p below the UK average.
Where is the cheapest petrol in Carmarthen?
Right now the cheapest unleaded we can see in Carmarthen is at MURCO, GWALIA GARAGE, CARMARTHEN, SA32 7DR, at 165.9p per litre. Prices change through the day, so check before you set off.
How often are these fuel prices updated?
We refresh prices every 15 minutes from the GOV.UK Fuel Finder scheme, where forecourts report their pump prices.
Fuel prices in other towns and cities
Contains public sector information licensed under the Open Government Licence v3.0. Prices from the GOV.UK Fuel Finder scheme.
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