Petrol (E10) prices in Carmarthen averaged 146.2p per litre in March 2026, up 13.0p from the previous period. The highest recorded price was 157.9p in March 2026.

Prices have been trending upward in Carmarthen recently. Drivers may want to shop around and compare prices between stations to find the best deal.

Over this period, Petrol (E10) prices in Carmarthen ranged from 125.9p to 157.9p per litre — a spread of 32.0p. This significant variation means it pays to compare prices between stations.