Compare petrol and diesel prices at stations in Carmarthen, Wales. Updated every 15 minutes.
As of 27 July 2026, the average price of petrol (E10) in Carmarthen is 157.1p per litre — 0.6p below the UK average of 157.7p. The cheapest petrol in Carmarthen today is 153.9p at CKs Supermarket, and diesel (B7) averages 173.7p (cheapest 169.9p).
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
#1CKs Supermarket153.9p#2Derwydd Services154.9p#3TANERDY GARAGE156.9p#4GWALIA GARAGE156.9p#5VST TOWY SERVICES STATION157.9p#6ASDA WHITE MILL EXPRESS PETROL157.9p#7oil 4 wales ltd Nantycaws157.9p#8CARMARTHEN EXTRA - PETROL FILLING STATION157.9p#9ASCONA TENBY ROAD SERVICE STATION157.9p#10MFG MORRISONS CARMARTHEN157.9p#11ASCONA FORGE FILLING STATION157.9pLive B7 diesel prices at the nearest forecourts · updated every 15 minutes
#1CKs Supermarket169.9p#2Derwydd Services169.9p#3GWALIA GARAGE171.9p#4TANERDY GARAGE171.9p#5CARMARTHEN EXTRA - PETROL FILLING STATION172.9p#6MFG MORRISONS CARMARTHEN172.9p#7VST TOWY SERVICES STATION172.9p#8oil 4 wales ltd Nantycaws175.9p#9ASCONA FORGE FILLING STATION176.9p#10ASCONA TENBY ROAD SERVICE STATION176.9p#11ASDA WHITE MILL EXPRESS PETROL178.9pFinding cheapest fuel in Carmarthen...
As of 27 July 2026, petrol (E10) in Carmarthen averages 157.1p per litre and diesel (B7) about 173.7p. Prices refresh every 15 minutes from the UK Government Fuel Finder scheme.
The cheapest petrol in Carmarthen right now is 153.9p per litre at CKs Supermarket. The live list above ranks every nearby forecourt by price.
Yes — petrol in Carmarthen averages 157.1p, about 0.6p below the UK average of 157.7p.
Stations with live prices in and around Carmarthen include CKs Supermarket, Derwydd Services, Tanerdy Garage, Gwalia Garage, Vst Towy Services Station and more — see the full ranked list above, or open the live map for every forecourt with today's prices.