Cheapest fuel in Carmarthen
We hold recently reported prices for 8 forecourts in Carmarthen. Every price below carries the date the retailer reported it, so you can see how recent it is before you drive.
Cheapest by fuel type
The lowest reported price for each fuel across Carmarthen, and where it was reported.
E10 — standard petrol
Unleaded
169.9p
Gwalia GarageSA32 7DR
Price from 18 Oct 2026E5 — premium petrol
Super unleaded
178.5p
Gwalia GarageSA32 7DR
Price from 18 Oct 2026B7 — standard diesel
Diesel
194.9p
Mfg Morrisons CarmarthenSA31 2NF
Price from 18 Oct 2026V-Power / Ultimate
Premium diesel
205.5p
Tanerdy GarageSA31 2EY
Price from 18 Oct 2026Is fuel dear in Carmarthen?
The Carmarthen figure is the average of the forecourts listed on this page. The UK figure is national — it is not limited to Carmarthen — and it is taken over the 6,153 forecourts that reported a price in the most recent GOV.UK snapshot, out of the 8,136 forecourts we currently list. That is what it was calculated from, rather than every forecourt in the country.
| Fuel | Carmarthen avg | UK avg | Difference |
|---|---|---|---|
| Unleaded7 forecourts | 172.0p | 174.0p | 2.0p cheaper |
| Super unleaded6 forecourts | 187.8p | 192.3p | 4.6p cheaper |
| Diesel7 forecourts | 196.6p | 199.0p | 2.4p cheaper |
| Premium diesel4 forecourts | 212.9p | 218.8p | 5.9p cheaper |
Within Carmarthen, unleaded runs from 169.9p at Gwalia Garage to 173.9p at Cks Supermarket — about £2.00 on a 50-litre fill, if both prices still stand.
Carmarthen forecourts, cheapest unleaded first
7 of 8 Carmarthen forecourts report unleaded. The figure under each price is the difference from the UK average of 174.0p.
Gwalia Garage
BrandedGWALIA GARAGE, RHYDARGAEAU, CARMARTHENSA32 7DR
169.9p
-4.1p vs UKDerwydd Services
BrandedDERWYDD GARAGE, CYNWYL ELFED, CARMARTHEN, SA33 6TP, CARMARTHENSA33 6TP
170.9p
-3.1p vs UK
Mfg Morrisons Carmarthen
SupermarketPARC PENSARN, CARMARTHEN, CARMARTHENSHIRESA31 2NF
170.9p
-3.1p vs UKTanerdy Garage
BrandedTANERDY GARAGE, TANERDY , CARMARTHENSA31 2EY
170.9p
-3.1p vs UK
Mfg St Clears
BrandedST CLEARS ROUNDABOUT, TENBY ROAD, ST CLEARS, CARMARTHENSA33 4JW
173.9p
-0.1p vs UKAscona Tenby Road Service Station
BrandedLYSONNEN ROAD, CARMARTHEN, CARMARTHEN, CARMARTHENSHIRESA33 5DT
173.9p
-0.1p vs UKCks Supermarket
BrandedC K'S SUPERMARKET, OLD ST. CLEARS ROAD, JOHNSTOWN, CARMARTHENSA31 3HL
173.9p
-0.1p vs UKWhere these prices come from
Prices are published by the retailers themselves under the government's fuel price transparency scheme and are shown in pence per litre. A forecourt only appears here once it has actually reported, and we show its reported date rather than assuming today's price. Prices can change between a retailer reporting and you arriving, so always check the pump.
Common questions about fuel in Carmarthen
Every answer below is worked out from the forecourt prices on this page.
Where is the cheapest unleaded in Carmarthen?
Gwalia Garage, SA32 7DR, at 169.9p a litre. That is the lowest unleaded price of the 7 Carmarthen forecourts reporting it. The retailer reported it today (18 Oct 2026). Prices can change between a retailer reporting and you arriving, so check the pump.
How many petrol stations in Carmarthen report their fuel prices?
We hold a recently reported price for 8 forecourts in Carmarthen, published by the retailers themselves under the government's fuel price transparency scheme. That is what has reported recently enough for us to list, rather than a count of every forecourt in Carmarthen — a site that stops reporting drops out, and one that has never reported never appears. Not every forecourt sells every fuel: 7 quote unleaded, 6 quote super unleaded, 7 quote diesel, 4 quote premium diesel. All 7 of the forecourts quoting unleaded are ranked on this page.
Is unleaded cheaper in Carmarthen than the UK average?
Carmarthen averages 172.0p for unleaded across the 7 forecourts quoting it, which is 2.0p a litre cheaper than the UK average of 174.0p. The UK figure is taken over the 6,153 forecourts that reported a price in the most recent GOV.UK snapshot, out of the 8,136 forecourts we currently list, so it is not limited to Carmarthen.
How up to date are these Carmarthen fuel prices?
Every price on this page was reported today. Retailers report into the scheme themselves, anywhere from daily to occasionally, so no price here is a live pump price — each one is shown with the date it was reported.
How much can I save by shopping around for unleaded in Carmarthen?
Unleaded runs from 169.9p to 173.9p across the 7 Carmarthen forecourts quoting it — a gap of 4.0p a litre, or about £2.00 on a 50-litre fill, if both prices still stand when you get there.
Fuel prices near Carmarthen
The nearest towns to Carmarthen with at least 5 reporting forecourts, up to 50 miles away. Distances are straight-line, from the middle of the Carmarthen forecourts listed above to that town's nearest one.
Fuel prices in Llanelli
11 forecourts · about 8.5 miles away
Fuel prices in Swansea
26 forecourts · about 18 miles away
Fuel prices in Neath
8 forecourts · about 24 miles away
Fuel prices in Newport
24 forecourts · about 27 miles away
Fuel prices in Haverfordwest
6 forecourts · about 28 miles away
Fuel prices in Bridgend
16 forecourts · about 35 miles away
Fuel prices in Aberystwyth
5 forecourts · about 39 miles away
Fuel prices in Pontypridd
5 forecourts · about 45 miles away
Garages near Carmarthen
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