Petrol (Unleaded) in Carmarthen costs from 165.9p to 171.9p a litre right now, 167.9p on average across 9 stations. Diesel in Carmarthen costs from 186.9p to 191.9p a litre right now, 189.1p on average across 10 stations.The cheapest is Murco - CARMARTHEN, 1.4 km from the centre. Prices last updated 09:34 (Europe/London).
A 55-litre fill-up at the cheapest station in Carmarthen instead of the dearest one, and instead of the city average.
Supermarket forecourts in Carmarthen: Tesco, Morrisons.
Calculated from the same live prices as the station table below — 10 stations in Carmarthen, at the update time shown above.
| Station | |||||
|---|---|---|---|---|---|
|
1
Murco - CARMARTHEN
Murco · SA31 2EY
|
1.4 km | 1.869 | 1.669 | — | 1.925 |
|
2
Tesco - CAERFYRDDIN
Tesco · SA31 3AX
|
1.7 km | 1.869 | — | — | — |
|
3
Morrisons - CARMARTHEN
Morrisons · SA31 2NF
|
2.6 km | 1.879 | 1.659 | 1.859 | — |
|
4
Murco - CARMARTHEN
Murco · SA31 3HL
|
2.1 km | 1.879 | 1.669 | — | — |
|
5
Texaco - CAERFYRDDIN
Texaco · SA31 2BN
|
1.7 km | 1.879 | 1.659 | 1.899 | — |
|
6
Murco - CARMARTHEN
Murco · SA33 6TP
|
6.5 km | 1.889 | 1.669 | 1.739 | — |
|
7
Murco - CARMARTHEN
Murco · SA32 7DR
|
5.1 km | 1.889 | 1.669 | 1.725 | — |
|
8
Esso - CARMARTHEN
Esso · SA32 7EN
|
5.3 km | 1.919 | 1.719 | — | — |
|
9
Oil 4 Wales Ltd - CAERFYRDDIN
Oil 4 Wales Ltd · SA32 8BG
|
7.1 km | 1.919 | 1.699 | — | — |
|
10
Valero - CARMARTHEN
Valero · SA33 5DT
|
5.2 km | 1.919 | 1.699 | 1.969 | 2.199 |
2026-08-15: 184.3p 2026-09-14: 190.6p
Diesel is up 5.3p versus 7 days ago (10 stations with prices on both days).
Tracked continuously: 3 of 10 stations · 2026-08-15 to 2026-09-14
| Brand | From | Average | Stations |
|---|---|---|---|
| Murco | 186.9p | 188.1p | 4 |
| Tesco | 186.9p | 186.9p | 1 |
| Morrisons | 187.9p | 187.9p | 1 |
| Texaco | 187.9p | 187.9p | 1 |
| Oil 4 Wales Ltd | 191.9p | 191.9p | 1 |
| Esso | 191.9p | 191.9p | 1 |
| Valero | 191.9p | 191.9p | 1 |
Carmarthen itself has 10 petrol stations with live prices tracked on fuel-prices.eu. Including the towns within roughly 10 km, the total rises to 18 stations. Data comes from the UK official fuel price data scheme.
The cheapest diesel in Carmarthen today is 186.9p a litre at Murco - CARMARTHEN. Prices in nearby towns are often lower — use the +2 / +5 / +10 km filter above to compare.
The average diesel price in Carmarthen is 189.1p a litre, 2.8p below the national average of 192.0p.
The cheapest petrol in Carmarthen today is 165.9p a litre at Morrisons - CARMARTHEN, 2.6 km from the city centre. It is 2.1p below the Carmarthen average of 167.9p across the 9 stations we track in the city.
Yes. Supermarket forecourts in Carmarthen (Tesco, Morrisons) average 187.4p a litre for diesel across 2 stations, against 189.5p at the other 8 stations — 2.1p cheaper.
Prices are updated daily from the UK official fuel price data scheme (retailer price feeds published under the government fuel-finder initiative).
Prices are collected from the UK official fuel price data scheme — the open price feeds published by major retailers under the government fuel-finder initiative — and refreshed daily. Prices are indicative and may differ at the pump. See also: live map of the UK · all live markets.
Contains public sector information licensed under the Open Government Licence v3.0. Source: Fuel Finder (CMA / GOV.UK).