Petrol Prices in Cardiff
Today's cheapest petrol across Cardiff and South Wales, ranked pence per litre.
Petrol prices across Cardiff are not one number — they are hundreds of them. On any given day the gap between the cheapest and most expensive petrol pump in the CF postcode area regularly exceeds 10p per litre, which is £5 or more on a single 50-litre fill.
This page tracks petrol only. fuelfinder.ai lists every Cardiff forecourt that reports to the UK Government's CMA Pump Watch open-data scheme, ranks them by petrol pence-per-litre, and shows how recently each price was confirmed. Standard UK unleaded is E10 — up to 10% bioethanol. Most forecourts also sell E5 super unleaded at a premium of roughly 10–20p per litre.
If you want diesel prices as well, the Cardiff fuel prices hub covers both grades side by side. If you only ever put petrol in the tank, this is the faster page — search a CF postcode and the cheapest petrol near you is at the top of the list.
How It Works
- Step 1: Enter a Cardiff postcode — Any CF postcode, or share your location for instant results.
- Step 2: Compare petrol only — Every nearby forecourt's E10 unleaded price, cheapest first, with the last-updated time.
- Step 3: Fill up for less — Tap through for directions to the cheapest petrol pump on your route.
Why Drivers Use fuelfinder.ai
- petrol focused — Ranked on E10 unleaded alone — no averaging across grades that don't go in your tank.
- South Wales coverage — Every Cardiff forecourt in the CMA feed, plus surrounding South Wales sites.
- Always free — No account, no app download, no paywall on prices.
- Built for the road — Loads fast on mobile so you can check before you commit to a forecourt.
Frequently Asked Questions
Where is the cheapest petrol in Cardiff today?
It changes daily. Supermarket forecourts — Asda, Tesco, Sainsbury's, Morrisons and Costco where present — usually lead on petrol in Cardiff, typically 5–10p below the branded majors. Search your postcode above for today's actual ranking rather than relying on a rule of thumb.
How much does petrol cost in Cardiff right now?
The live table on this page shows the current cheapest, median and most expensive petrol price reported across Cardiff. Figures come from the CMA Pump Watch feed and refresh twice daily, so they reflect what retailers have officially declared.
What grade of petrol do Cardiff stations sell?
Standard UK unleaded is E10 — up to 10% bioethanol. Most forecourts also sell E5 super unleaded at a premium of roughly 10–20p per litre.
Is premium petrol worth it in Cardiff?
Super unleaded (E5) is worth paying for only if your vehicle handbook specifically requires 97+ RON. For the vast majority of cars, standard E10 is the correct fuel.
Why is petrol cheaper in some parts of Cardiff?
Local competition is the biggest factor. Where two supermarkets sit within a mile of each other, both price aggressively. Sites with no nearby rival — city-centre forecourts, or stations on a single-approach road — have no pressure to match, and Cardiff pump prices reflect that.
How often is Cardiff petrol price data updated?
Retailers submit to the CMA scheme through the day and fuelfinder.ai refreshes twice daily. Each station row shows its own last-updated time, so you can see whether a price is hours or days old before you drive to it.