Cheapest Petrol Prices in Carmarthen
Last updated: · 17 stations tracked
Cheapest Petrol (E10)
157.9p
per litre · avg 160.37p
Cheapest Diesel (B7)
179.9p
per litre · avg 181.78p
Compare live petrol and diesel prices across 17 fuel stations in Carmarthen. Prices are sourced from the UK Government's official fuel price database and updated every hour. The cheapest petrol in Carmarthen today is 157.9p per litre, available at GWALIA GARAGE.
Supermarket forecourts — including Tesco, Asda, and Sainsbury's — typically offer the lowest prices in Carmarthen. Motorway services and branded stations (BP, Shell, Esso) often charge a premium. Use the table below to find the best deal near you.
Fuel Station Prices in Carmarthen
| Station | Unleaded (E10) | Diesel (B7) | Super Unleaded | Premium Diesel |
|---|---|---|---|---|
| CARMARTHEN EXTRA - PETROL FILLING STATION | 159.9p | 179.9p | 169.9p | — |
| VST TOWY SERVICES STATION | 159.9p | 179.9p | 184.9p | — |
| CKs Supermarket | 160.9p | 180.9p | — | — |
| TANERDY GARAGE | 159.9p | 179.9p | 167.5p | 186.5p |
| MFG MORRISONS CARMARTHEN | 159.9p | 180.9p | 175.9p | — |
| ASCONA TENBY ROAD SERVICE STATION | 159.9p | 183.9p | 194.9p | 214.9p |
| ASDA WHITE MILL EXPRESS PETROL | 163.9p | 182.9p | — | — |
| GWALIA GARAGE | 157.9p | 179.9p | 166.5p | 187.5p |
| oil 4 wales ltd Nantycaws | 159.9p | 183.9p | — | — |
| Derwydd Services | 158.9p | 179.9p | 171.9p | 155.9p |
| ASCONA FORGE FILLING STATION | 159.9p | 183.9p | 194.9p | 214.9p |
| Windy Corner Garage | 157.9p | 179.9p | — | — |
| ASDA PONTYATES EXPRESS PETROL | 164.9p | 182.9p | — | — |
| LEWIS RETAIL DREFACH LTD | 157.9p | 179.9p | — | — |
| MFG ST CLEARS | 159.9p | 184.9p | 179.9p | 199.9p |
| KIDWELLY SERVICE STATION | 164.9p | 182.9p | — | — |
| ASCONA IVY SERVICE STATION | 159.9p | 183.9p | 194.9p | 214.9p |
Frequently Asked Questions
What is the cheapest petrol price in Carmarthen?
The cheapest petrol in Carmarthen is currently 157.9p per litre as of 1 September 2026. The average across all stations is 160.37p.
Which supermarket has the cheapest fuel in Carmarthen?
Tesco, Asda, and Sainsbury's supermarket forecourts typically offer the lowest fuel prices in Carmarthen. Check the price table above to compare all stations including branded and independent retailers.
How often are fuel prices updated for Carmarthen?
Prices are updated hourly from the UK Government's mandatory fuel price reporting scheme, which requires all fuel retailers with 6 or more sites to submit prices every 30 minutes.