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Petrol and diesel prices in Carmarthenshire

Average pump prices across 43 filling stations in Carmarthenshire, from the prices every UK forecourt must now publish under the government’s Fuel Finder scheme. Checked 16 Sept, 16:47.

Last updated
Records analysed
8,070 filling stations
Methodology
View methodology
  • Average unleaded petrol 169.5p 2.2p below the UK average
  • Average diesel 192.3p 2.3p below the UK average
  • Cheapest petrol 163.9p Tesco Ammanford Superstore
  • Filling stations 43 20 at supermarkets

Unleaded petrol averages 169.5p a litre across 42 forecourts in Carmarthenshire, 2.2p below the UK average. Diesel averages 192.3p, 2.3p below the UK average. The cheapest petrol is at Tesco Ammanford Superstore, 163.9p; the dearest is 175.9p. The cheapest diesel is there too, 184.9p.

Cheapest petrol and diesel in Carmarthenshire

Unleaded petrol (E10)
Filling station Price
Tesco Ammanford Superstore Rhydaman 163.9p
Texaco Glanamman Service Station Ammanford 165.9p
Texaco Vst Parkstreet SA18 165.9p
Murco Derwydd Services Carmarthen 166.9p
Essar Penybanc Service Statioin Ammanford 166.9p
Texaco Vst Pontamman Service Station Ammanford 166.9p
Texaco Vst Towy Services Station Caerfyrddin 166.9p
Asda Llanelli Murray Street Supercentre Llanelli 167.7p
Tesco Carmarthen Extra Caerfyrddin 167.9p
Murco Gwalia Garage Carmarthen 167.9p
Diesel (B7)
Filling station Price
Tesco Ammanford Superstore Rhydaman 184.9p
Essar Penybanc Service Statioin Ammanford 187.9p
Texaco Glanamman Service Station Ammanford 187.9p
Texaco Vst Parkstreet SA18 187.9p
Texaco Vst Pontamman Service Station Ammanford 187.9p
Asda Llanelli Murray Street Supercentre Llanelli 189.7p
Tesco Carmarthen Extra Caerfyrddin 189.9p
Murco Daniel Davies and Sons Limited SA44 189.9p
Murco Gwalia Garage Carmarthen 189.9p
Tesco Llanelli Extra Llanelli 189.9p

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Supermarkets against other forecourts

Supermarket petrol is 2.9p a litre cheaper on average than at other forecourts in Carmarthenshire.

Average prices by type of forecourt in Carmarthenshire
Forecourts Petrol Diesel Stations
Supermarkets 168.0p 190.6p 20
Other forecourts 170.9p 193.9p 22

Council areas in Wales, cheapest first

Carmarthenshire is number 7 of 22 for petrol.

Council areas in Wales: average fuel prices
Area Petrol Diesel Stations
Pembrokeshire 168.0p 191.5p 32
Torfaen 168.7p 191.0p 9
Caerphilly 168.8p 191.7p 23
Ceredigion 169.3p 193.7p 25
Neath Port Talbot 169.3p 192.7p 18
Vale of Glamorgan 169.4p 193.9p 11
Carmarthenshire 169.5p 192.3p 43
Bridgend 169.8p 193.1p 18
Rhondda Cynon Taf 170.1p 193.2p 26
Isle of Anglesey 170.2p 194.7p 16
Blaenau Gwent 170.2p 191.4p 9
Powys 170.9p 194.9p 49
Wrexham 171.3p 193.0p 18
Cardiff 171.3p 194.3p 31
Gwynedd 171.4p 195.3p 36
Newport 171.4p 194.4p 17
Swansea 172.6p 195.1p 29
Merthyr Tydfil 173.7p 198.5p 5
Monmouthshire 173.8p 196.3p 18
Flintshire 174.3p 195.1p 31
Denbighshire 174.6p 195.4p 17
Conwy 175.4p 196.7p 17

Every filling station in Carmarthenshire

Every filling station in Carmarthenshire and its prices
Filling station Petrol Diesel Updated
Tesco Ammanford Superstore Rhydaman · supermarket 163.9p 184.9p 14 Sept, 15:50
Texaco Glanamman Service Station Ammanford · supermarket 165.9p 187.9p 14 Sept, 15:11
Texaco Vst Parkstreet SA18 · supermarket 165.9p 187.9p 15 Sept, 07:34
Murco Derwydd Services Carmarthen · supermarket 166.9p 193.9p 14 Sept, 12:45
Essar Penybanc Service Statioin Ammanford 166.9p 187.9p 15 Sept, 16:22
Texaco Vst Pontamman Service Station Ammanford · supermarket 166.9p 187.9p 16 Sept, 06:23
Texaco Vst Towy Services Station Caerfyrddin · supermarket 166.9p 189.9p 15 Sept, 23:57
Asda Llanelli Murray Street Supercentre Llanelli · supermarket 167.7p 189.7p 15 Sept, 13:44
Tesco Carmarthen Extra Caerfyrddin · supermarket 167.9p 189.9p 14 Sept, 16:38
Murco Gwalia Garage Carmarthen 167.9p 189.9p 15 Sept, 07:13
Tesco Llanelli Extra Llanelli · supermarket 167.9p 189.9p 14 Sept, 16:02
MFG Morrisons Carmarthen Carmarthen · supermarket 167.9p 189.9p 15 Sept, 23:51
MFG Morrisons Llanelli Llanelli · supermarket 167.9p 189.9p 14 Sept, 22:00
Murco Tanerdy Garage Carmarthen 167.9p 189.9p 15 Sept, 06:14
Murco Cks Supermarket Carmarthen · supermarket 168.9p 192.9p 15 Sept, 10:57
Murco Daniel Davies and Sons Limited SA44 168.9p 189.9p 8 Sept, 09:00
Esso Glandycross Service Station Clynderwen · supermarket 168.9p 193.9p 16 Sept, 13:05
Nts Llanelli Service Station Llanelli · supermarket 168.9p 189.9p 15 Sept, 07:09
Texaco Vst Bryn Gelli Services Llanelli · supermarket 168.9p 189.9p 15 Sept, 23:34
Texaco Vst Pensarnau Service Station Castell Newydd Emlyn · supermarket 168.9p 189.9p 10 Sept, 07:29
Texaco Ascona Manordeilo Service Station Llandeilo 169.7p 196.7p 12 Sept, 07:56
Murco Checkpoint Service Station Carmarthenshire · supermarket 169.9p 193.9p 14 Sept, 14:51
Essar Chivers Corner Garage Camarthenshire · supermarket 169.9p 191.9p 16 Sept, 14:44
Lewis Retail Drefach Ltd Llanelli · supermarket 169.9p 196.9p 14 Sept, 09:34
Murco Llandeilo Service Station Llandeilo 169.9p 196.9p 14 Sept, 09:59
Oil 4 Wales Morris Isaacs Llandovery 169.9p 196.9p 12 Sept, 05:31
Oil 4 Wales Ltd Nantycaws Caerfyrddin · supermarket 169.9p 191.9p 12 Sept, 08:41
Murco Sandy Road Llanelli 169.9p 191.9p 15 Sept, 22:25
Shell Valley Service Station Llandysul 169.9p 194.9p 14 Sept, 14:25
Windy Corner Garage Pencader 169.9p 191.9p 11 Sept, 19:31
Valero Ascona Gorslas Service Station Gorslas 171.7p 194.7p 16 Sept, 07:46
Valero Ascona Forge Carmarthen Road 171.9p 194.9p 16 Sept, 08:10
Valero Ascona Ivy Service Station St Clears 171.9p 194.9p 16 Sept, 08:00
Valero Ascona Tenby Road Service Station Carmarthen 171.9p 194.9p 16 Sept, 08:29
Asda Pontyates Express Petrol Pontyates 171.9p 195.9p 16 Sept, 15:44
Murco Kidwelly Service Station Kidwelly 171.9p 191.9p 14 Sept, 14:20
Valero MFG Cross Hands Gorslas / Cross Hands 171.9p 194.9p 15 Sept, 23:48
Valero MFG Panteg Panteg 171.9p 193.9p 15 Sept, 23:37
Esso MFG St Clears Tenby Road, St Clears 171.9p 194.9p 15 Sept, 23:48
Esso Rontec Cross Hands Llanelli 171.9p 194.9p 16 Sept, 13:24
Esso Asda White Mill Express Petrol Carmarthen 173.9p 192.9p 16 Sept, 13:41
Dafen Service Station Llanelli 175.9p 199.9p 16 Sept, 10:52
Esso Asda Pont Abraham Express Petrol Llanedi · motorway – – 21 Aug, 17:52

A dash means no current price: none reported, not changed for over two weeks, or not believable.

Data sources and methodology

Datasets used on this page
Figures Source Period Records Updated
Forecourt prices Fuel Finder open data Fuel Finder statutory scheme
ONS Postcode Directory Office for National Statistics 		Prices at 16:47 on 16 September 2026 8,070 filling stations 16 September 2026
  • Averages use unleaded (E10) and standard diesel (B7) prices at open forecourts, leaving out prices unchanged for over two weeks or far from every other forecourt. They count each forecourt once, not by how much fuel it sells.
  • Forecourts are placed in council areas from their postcode, using the ONS Postcode Directory.
How we calculate these figures All data sources

Source: Fuel Finder, the UK government’s statutory fuel price scheme.

Source: Office for National Statistics licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026.