Weekly bulletin, 21 to 27 September 2026. Published Monday 28 September 2026.
Petrol prices in Cardiff: up 1.6p this week to 173.7p
Between Monday 21 September 2026 and Sunday 27 September 2026, the average price of unleaded across 22 filling stations in Cardiff rose 1.6p to 173.7p a litre, while diesel rose 3.2p to 199.2p.
Cheapest and most expensive
On Sunday 27 September 2026, prices updated within 30 days, judged against their neighbours.
The last 30 days
Daily averages, in pence per litre. Right-click the image to save it; it is free to publish with a link.
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The weekly change compares the same 21 filling stations with an unleaded price on both days, so a station dropping out of the figures does not move it.
21 of the 23 stations seen during the week changed at least one price.
The cheapest unleaded in Cardiff on Sunday 27 September 2026 was 170.9p at Asda Cardiff Bay Superstore, Cardiff (CF11 0JR); the most expensive was 176.9p at Asda Llantrisant Express Petrol, Cardiff (CF5 2PW), a gap of 6.0p, or £3.00 on a 50-litre tank.
The cheapest diesel was 194.9p at Asda Cardiff Bay Superstore, Cardiff (CF11 0JR).
Across the UK, unleaded was up 1.7p over the same week, at 173.7p, which puts Cardiff level with the national average.
"Drivers in Cardiff paid 1.6p more for a litre of unleaded this week. On a 50-litre tank, that is £0.80 more than a week earlier. The gap between the cheapest and the dearest forecourt in Cardiff is 6.0p, so where you fill up still matters more than when." said Jacky A., editor of fuelpricetoday.co.uk.
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Petrol prices in Cardiff: up 1.6p this week to 173.7p Between Monday 21 September 2026 and Sunday 27 September 2026, the average price of unleaded across 22 filling stations in Cardiff rose 1.6p to 173.7p a litre, while diesel rose 3.2p to 199.2p. The weekly change compares the same 21 filling stations with an unleaded price on both days, so a station dropping out of the figures does not move it. 21 of the 23 stations seen during the week changed at least one price. The cheapest unleaded in Cardiff on Sunday 27 September 2026 was 170.9p at Asda Cardiff Bay Superstore, Cardiff (CF11 0JR); the most expensive was 176.9p at Asda Llantrisant Express Petrol, Cardiff (CF5 2PW), a gap of 6.0p, or £3.00 on a 50-litre tank. The cheapest diesel was 194.9p at Asda Cardiff Bay Superstore, Cardiff (CF11 0JR). Across the UK, unleaded was up 1.7p over the same week, at 173.7p, which puts Cardiff level with the national average. "Drivers in Cardiff paid 1.6p more for a litre of unleaded this week. On a 50-litre tank, that is £0.80 more than a week earlier. The gap between the cheapest and the dearest forecourt in Cardiff is 6.0p, so where you fill up still matters more than when." said Jacky A., editor of fuelpricetoday.co.uk. Source: fuelpricetoday.co.uk, weekly bulletin for Cardiff, 21 to 27 September 2026. https://fuelpricetoday.co.uk/press/2026-W39/town-cardiff Prices are pence per litre, computed from the government's Fuel Finder open data. Free to use with a link to the source.
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- Every station (CSV)
Name, brand, postcode, coordinates, unleaded and diesel on 21 Sep and 27 Sep.
- This bulletin (JSON)
All the figures on this page, with the 30-day series.
- The chart (PNG)
1200 by 630 pixels, white background.
Terms of use
Free to use, quote and publish, including the chart and the data, with a link to https://fuelpricetoday.co.uk/press/2026-W39/town-cardiff or a credit to fuelpricetoday.co.uk. Prices are computed from the Fuel Finder open data published by the Department for Energy Security and Net Zero under the Open Government Licence v3.0. Questions, a figure for another area, or a quote: contact@fuelpricetoday.co.uk.
How the figures are computed
Each average is the mean of the prices changed in the last 7 days at the filling stations of Cardiff, motorway services left out and prices more than 25p from the day's median discarded. The cheapest and most expensive stations are judged against the stations within 10 km, so that a typing error cannot top the list. The week runs from Monday to Sunday. Details on how this site works.