The price of oil is expected to soar on Monday while stock markets could tumble as the US-Israel war on Iran rattles investors.

US crude oil is on track to rise by 9% when trading resumes, according to data from the broker IG, after Tehran said on Saturday it had in effect closed the strait of Hormuz, a key oil choke point, reportedly prompting the halt of some oil shipments.

IG’s weekend markets showed that US crude oil could rise to more than $73 a barrel when trading resumes in New York late on Sunday, up from $67 a barrel on Friday night. That would be its highest level since June 2025, when the US launched strikes on Iran’s nuclear facilities, and threatens to feed through to higher prices for drivers at the pump.

Analysts at Barclays said the oil price could reach $80 a barrel in the event of a “material supply disruption”.