Petrol and Diesel Prices in Carmarthen
Compare petrol and diesel prices at 6 petrol stations in Carmarthen. Prices last updated 08:32 27/03/2026.
Petrol (E10)
144.9p
at MFG MORRISONS CARMARTHEN
Diesel (B7)
170.9p
at MFG MORRISONS CARMARTHEN
Super Unleaded (E5)
157.5p
at TANERDY GARAGE
Premium Diesel
183.5p
at TANERDY GARAGE
Unleaded (E10)
150.0p avg
In line with UK average (150.2p)
Diesel
177.0p avg
1.2p below UK average (178.2p)
Price History in Carmarthen
See how fuel prices have changed over time with interactive charts and analysis.
Click any column header to sort. Prices shown in pence per litre.
Carmarthen currently has 6 petrol stations tracked by Fuel Costs UK. The average unleaded petrol price in Carmarthen today is 150.0p per litre, which is in line with the UK national average of 150.2p.
The cheapest unleaded petrol in Carmarthen right now is 144.9p at MFG MORRISONS CARMARTHEN. The cheapest diesel is 170.9p at MFG MORRISONS CARMARTHEN.
Fuel prices in Carmarthen are sourced from the UK Government's CMA Fuel Finder scheme and updated every 4 minutes. We recommend comparing prices before filling up, as prices can vary significantly between stations even within the same town.