Weekly bulletin, 14 to 20 September 2026. Published Monday 21 September 2026.
Petrol prices in the Swansea postcode area (SA): up 2.5p this week to 170.9p
Between Monday 14 September 2026 and Sunday 20 September 2026, the average price of unleaded across 117 filling stations in the Swansea postcode area (SA) rose 2.5p to 170.9p a litre, while diesel rose 4.3p to 195.2p.
Cheapest and most expensive
On Sunday 20 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.
Towns in the Swansea postcode area (SA) where unleaded moved most
Towns with at least three filling stations, first to last day of the week.
Biggest falls
| Town | Stations | Now | Week |
|---|
Biggest rises
| Town | Stations | Now | Week |
|---|---|---|---|
| Cardigan | 4 | 165.7p | ▲ 4.0p |
| Haverfordwest | 5 | 171.7p | ▲ 3.6p |
| Caerfyrddin | 3 | 171.2p | ▲ 3.3p |
Stations that joined or went silent this week
Stations that reported their first price during the week, and stations whose last price came before or during it and that have been silent for 7 days or more since.
Started reporting 0
None this week.
Stopped reporting 2
- Robert Davies Motors, Aberteifi, SA43 1RQ, 15 Sep
- Robert Davies Motors, Cardigan, SA43 2NR, 15 Sep
A station that stops reporting has not necessarily closed. The full lists: new stations and stations no longer reporting.
Ready to copy
The weekly change compares the same 114 filling stations with an unleaded price on both days, so a station dropping out of the figures does not move it.
128 of the 141 stations seen during the week changed at least one price.
The cheapest unleaded in the Swansea postcode area (SA) on Sunday 20 September 2026 was 161.9p at Milford Haven Superstore - Petrol Filling Station, Milford Haven (SA73 3AU); the most expensive was 175.9p at Shell Sketty, Sketty (SA2 9BZ), a gap of 14.0p, or £7.00 on a 50-litre tank.
The cheapest diesel was 182.9p at Milford Haven Superstore - Petrol Filling Station, Milford Haven (SA73 3AU).
Across the UK, unleaded was up 2.3p over the same week, at 172.3p, which puts the Swansea postcode area (SA) 1.4p below the national average.
Among the towns of the Swansea postcode area (SA), unleaded rose most in Cardigan (up 4.0p to 165.7p), Haverfordwest (up 3.6p to 171.7p), Caerfyrddin (up 3.3p to 171.2p).
"Drivers in the Swansea postcode area (SA) paid 2.5p more for a litre of unleaded this week. On a 50-litre tank, that is £1.25 more than a week earlier. The gap between the cheapest and the dearest forecourt in the Swansea postcode area (SA) is 14.0p, so where you fill up still matters more than when." said Jacky A., editor of fuelpricetoday.co.uk.
Show the plain text
Petrol prices in the Swansea postcode area (SA): up 2.5p this week to 170.9p Between Monday 14 September 2026 and Sunday 20 September 2026, the average price of unleaded across 117 filling stations in the Swansea postcode area (SA) rose 2.5p to 170.9p a litre, while diesel rose 4.3p to 195.2p. The weekly change compares the same 114 filling stations with an unleaded price on both days, so a station dropping out of the figures does not move it. 128 of the 141 stations seen during the week changed at least one price. The cheapest unleaded in the Swansea postcode area (SA) on Sunday 20 September 2026 was 161.9p at Milford Haven Superstore - Petrol Filling Station, Milford Haven (SA73 3AU); the most expensive was 175.9p at Shell Sketty, Sketty (SA2 9BZ), a gap of 14.0p, or £7.00 on a 50-litre tank. The cheapest diesel was 182.9p at Milford Haven Superstore - Petrol Filling Station, Milford Haven (SA73 3AU). Across the UK, unleaded was up 2.3p over the same week, at 172.3p, which puts the Swansea postcode area (SA) 1.4p below the national average. Among the towns of the Swansea postcode area (SA), unleaded rose most in Cardigan (up 4.0p to 165.7p), Haverfordwest (up 3.6p to 171.7p), Caerfyrddin (up 3.3p to 171.2p). "Drivers in the Swansea postcode area (SA) paid 2.5p more for a litre of unleaded this week. On a 50-litre tank, that is £1.25 more than a week earlier. The gap between the cheapest and the dearest forecourt in the Swansea postcode area (SA) is 14.0p, 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 the Swansea postcode area (SA), 14 to 20 September 2026. https://fuelpricetoday.co.uk/press/2026-W38/area-sa Prices are pence per litre, computed from the government's Fuel Finder open data. Free to use with a link to the source.
Download the data
- Every station (CSV)
Name, brand, postcode, coordinates, unleaded and diesel on 14 Sep and 20 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-W38/area-sa 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 the Swansea postcode area (SA), 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.