Local price scan
Cheapest petrol and diesel prices in Carmarthen
7 tracked forecourts in Carmarthen, last updated 6 October 2026. Prices are pence per litre.
Unleaded petrol (E10)
171.9p
cheapest · 173.5p average across 7 stations
Diesel (B7)
197.9p
cheapest · 199.3p average across 7 stations
Super unleaded (E5)
178.5p
cheapest · 186.1p average across 5 stations
Premium diesel
205.5p
cheapest · 210.6p average across 3 stations
Carmarthen price history
Daily average standard petrol and diesel prices across tracked local stations over the last 90 days.
Carmarthen stations ranked by price
| Derwydd ServicesMurco · SA33 6TP | 171.9p | 199.9p | 182.9p | — |
|---|---|---|---|---|
| GWALIA GARAGEMURCO · SA32 7DR | 171.9p | 197.9p | 178.5p | 206.5p |
| TANERDY GARAGEMURCO · SA31 2EY | 171.9p | 197.9p | 179.5p | 205.5p |
| MFG MORRISONS CARMARTHENMORRISONS · SA31 2NF | 173.9p | 199.9p | 189.9p | — |
| ASCONA TENBY ROAD SERVICE STATIONVALERO · SA33 5DT | 174.9p | 199.9p | 199.9p | 219.9p |
| ASDA WHITE MILL EXPRESS PETROLESSO · SA32 7EN | 174.9p | 199.9p | — | — |
| CKs SupermarketMurco · SA31 3HL | 174.9p | 199.9p | — | — |
Click a column heading to sort by that fuel — click again to flip the order.
Where these stations are
What drivers in Carmarthen should know
The gap between the cheapest and most expensive forecourt in Carmarthen is currently 3.0p per litre. On a typical 55-litre fill that is about £1.65 — worth a short detour if a cheaper site is already on your route.
At 173.5p the average unleaded petrol (e10) price in Carmarthen is below the UK-wide average of 174.7p that PumpScan is tracking, a difference of 1.2p per litre.
Brands represented locally include VALERO, ESSO, Murco, MURCO, MORRISONS. Supermarket forecourts usually undercut motorway services by a wide margin, and prices in and around Carmarthen tend to move within a day or two of a change in the wholesale oil price. Filling up mid-week and avoiding a near-empty tank on a motorway trip are the two simplest ways to keep costs down.
Compare Carmarthen against the rest of the country on the cheapest petrol in the UK and cheapest diesel in the UK leaderboards.
All filling stations in Carmarthen
- ASCONA TENBY ROAD SERVICE STATIONLYSONNEN ROAD, CARMARTHEN, CARMARTHEN, CARMARTHENSHIRE
- ASDA WHITE MILL EXPRESS PETROLA40, CARMARTHEN, CARMARTHEN
- CKs SupermarketC K'S SUPERMARKET, OLD ST. CLEARS ROAD, JOHNSTOWN, CARMARTHEN
- Derwydd ServicesDERWYDD GARAGE, CYNWYL ELFED, CARMARTHEN, SA33 6TP, CARMARTHEN
- GWALIA GARAGEGWALIA GARAGE, RHYDARGAEAU, CARMARTHEN
- MFG MORRISONS CARMARTHENPARC PENSARN, CARMARTHEN, CARMARTHENSHIRE
- TANERDY GARAGETANERDY GARAGE, TANERDY , CARMARTHEN
Looking elsewhere? See all areas covered by PumpScan UK. Area slug: /petrol-prices/carmarthen