Diesel prices in the United States have climbed sharply above $5 per gallon, reflecting growing disruption in global oil flows linked to the ongoing conflict involving Iran.
According to the Energy Information Administration, average diesel prices reached $5.375 per gallon on March 23, marking a 30-cent increase compared to the previous week. In higher-cost regions such as California, prices are approaching or exceeding $6 per gallon, while even lower-cost areas have now crossed the $5 threshold.
The surge represents a significant shift from early March, when diesel prices were still below $4 per gallon nationwide. The most dramatic increase occurred during the week of March 9, when prices jumped by 96 cents, followed by a further rise of 21 cents the following week.
The escalation is largely driven by geopolitical tensions affecting one of the world’s most critical energy corridors. The Strait of Hormuz, a key transit route for global oil supply, has become a focal point of uncertainty, tightening supply and driving up costs.
For the logistics sector, the implications are immediate and far-reaching. Trucking companies operating on spot markets are particularly exposed, as they lack the protection of fuel surcharge mechanisms. In contrast, contract freight operators are more likely to pass increased costs onto shippers through higher rates.
Jason Miller, a professor of supply chain management at Michigan State University, noted that while contract freight allows cost transfer, spot market carriers are forced to absorb the impact, reducing profitability.
The effects are also spreading across other transport modes. Ocean carriers such as Hapag-Lloyd and CMA CGM, as well as parcel operators including UPS and FedEx, have already introduced fuel surcharges in response to rising costs.
Despite the current surge, the EIA’s latest outlook still forecasts average diesel prices of $4.12 for 2026 and $3.78 for 2027. However, further disruptions in the Strait of Hormuz could tighten supply even more in the coming weeks, potentially pushing prices higher.
