Compare petrol and diesel prices at stations in Carmarthen, Wales. Updated every 15 minutes.
As of 3 August 2026, the average price of petrol (E10) in Carmarthen is 160.5p per litre — in line with the UK average of 160.9p. The cheapest petrol in Carmarthen today is 155.9p at GWALIA GARAGE, and diesel (B7) averages 179.3p (cheapest 175.9p).
Fuel prices in Carmarthen can differ by 10p a litre or more between forecourts just a few minutes apart, so a quick comparison can save you real money on every fill-up. This page shows up-to-date petrol, diesel and EV charging prices across Carmarthen, Wales, with the cheapest stations highlighted. All prices update every 15 minutes from official UK sources. You can also compare fuel prices in nearby Llanelli, Swansea, Neath.
Live E10 unleaded prices at the nearest forecourts · updated every 15 minutes
#1GWALIA GARAGE155.9p#2Derwydd Services157.9p#3TANERDY GARAGE157.9p#4oil 4 wales ltd Nantycaws158.9p#5ASDA WHITE MILL EXPRESS PETROL161.9p#6VST TOWY SERVICES STATION161.9p#7CARMARTHEN EXTRA - PETROL FILLING STATION161.9p#8MFG MORRISONS CARMARTHEN161.9p#9CKs Supermarket161.9p#10ASCONA FORGE FILLING STATION162.9p#11ASCONA TENBY ROAD SERVICE STATION162.9pLive B7 diesel prices at the nearest forecourts · updated every 15 minutes
#1Derwydd Services175.9p#2GWALIA GARAGE177.9p#3TANERDY GARAGE177.9p#4VST TOWY SERVICES STATION178.9p#5CARMARTHEN EXTRA - PETROL FILLING STATION178.9p#6MFG MORRISONS CARMARTHEN178.9p#7CKs Supermarket179.9p#8ASDA WHITE MILL EXPRESS PETROL179.9p#9oil 4 wales ltd Nantycaws179.9p#10ASCONA FORGE FILLING STATION181.9p#11ASCONA TENBY ROAD SERVICE STATION181.9pFinding cheapest fuel in Carmarthen...
As of 3 August 2026, petrol (E10) in Carmarthen averages 160.5p per litre and diesel (B7) about 179.3p. Prices refresh every 15 minutes from the UK Government Fuel Finder scheme.
The cheapest petrol in Carmarthen right now is 155.9p per litre at Gwalia Garage. The live list above ranks every nearby forecourt by price.
Carmarthen is in line with the UK average — 160.5p locally versus 160.9p nationally for petrol.
Stations with live prices in and around Carmarthen include Gwalia Garage, Derwydd Services, Tanerdy Garage, oil 4 wales ltd Nantycaws, Asda White Mill Express Petrol and more — see the full ranked list above, or open the live map for every forecourt with today's prices.