The average price of standard diesel increased from €1.435 per litre on February 27th, the day before the war began, to €1.759 per litre on Monday, a 22.6 percent rise, according to figures from the ecological transition ministry.
The figures are based on average prices across the country's service stations.
Prices for unleaded gasoline also surged, from €1.525 per litre on February 27th to €1.71 per litre on Monday, a 12.1 percent increase.
READ ALSO: How to find out where to get the cheapest fuel in Spain
The United States and Israel began striking Iran on February 28th, prompting a storm of retaliatory Iranian strikes across the oil-rich Gulf.
After spiking over recent days, oil prices fell sharply on Tuesday following comments from US President Donald Trump, who said the conflict with Iran would "end soon" and indicated plans to lift some sanctions on Iranian oil.
Spain imports most of its crude oil from the Americas and Africa, as it has virtually no domestic reserves.
"What the Spanish government will do is protect citizens, businesses and workers, as we did during the Ukraine war," Economy Minister Carlos Cuerpo told reporters on Monday, in remarks shared on his X account.
"We clearly know what measures can be implemented and we will put them on the table depending on how the situation develops," he added.
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