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Petrol Prices in Carmarthen

Average today: unleaded 167.3p · diesel 188.8p · UK average 169.4p / 191.1p

Checked 12 September 2026 · retailer-reported prices, changes filed within 30 minutes
Carmarthen trend: Unleaded ▲ 4.6p · 7d · Diesel ▲ 6.6p · 7d
The cheapest unleaded in Carmarthen today is 164.9p at Morrisons, Parc Pensarn. Filling a 55-litre tank at the cheapest station instead of the priciest saves about £3.85.

Cheapest Unleaded First

CheapestSet 10 Sep · Checked today
Morrisons Parc Pensarn, SA31 2NF
UNLEADED
164.9p
DIESEL
186.9p
Save up to £3.85 on a tank
Set 11 Sep · Checked today
Murco Tanerdy Garage, SA31 2EY
UNLEADED
164.9p
DIESEL
186.9p
Save up to £3.85 on a tank
Set 11 Sep · Checked today
Murco Gwalia Garage, SA32 7DR
UNLEADED
165.9p
DIESEL
186.9p
Save up to £3.30 on a tank
Set 11 Sep · Checked today
Murco Derwydd Garage, SA33 6TP
UNLEADED
166.9p
DIESEL
188.9p
Costs £1.10 more to fill up
Set 09 Sep · Checked today
Murco C K's Supermarket, SA31 3HL
UNLEADED
166.9p
DIESEL
187.9p
Costs £1.10 more to fill up
Set 12 Sep · Checked today
Valero Lysonnen Road, SA33 5DT
UNLEADED
169.9p
DIESEL
191.9p
Costs £2.75 more to fill up
Set 11 Sep · Checked today
Esso A40, Carmarthen, SA32 7EN
UNLEADED
171.9p
DIESEL
191.9p
Costs £3.85 more to fill up
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