How the Iran war could raise US prices, from gas to flights

Lead: The US-Israel war on Iran, now entering its fifth week as of 26 March 2026, has effectively closed parts of the Strait of Hormuz and disrupted shipments of oil and other key commodities. The immediate result has been sharp increases in energy costs—US pump gasoline averages $3.97 and diesel is up roughly 50% year-on-year—while knock-on effects threaten fertilizer, helium, jet fuel and wider supply chains. Even if hostilities end soon, analysts say it could take months for those price shocks to work their way through production and transport. Households and businesses already squeezed by high housing and grocery costs face fresh upward pressure on everyday prices.

Key Takeaways

• US retail gasoline averaged $3.97 nationally, about a 30% increase over the prior month, driven by constrained global crude flows. (AAA)
• Diesel prices have jumped roughly 50% year-on-year—about $1.69 higher—raising transport costs for goods that rely on trucking. (AAA)
• Roughly 85% of US agricultural goods move by truck, so higher diesel could raise grocery prices and farmer input costs. (US agriculture estimates)
• Around one-third of global urea trade transits the Middle East; Qatar accounts for about 20% of US imported fertilizer, exposing crop input supplies to regional disruptions. (Trade data)
• Jet fuel prices have doubled since the conflict began, prompting United Airlines to cut flights and warning of an $11bn annual fuel cost increase if prices remain elevated. (IATA, United)
• The helium market is strained after Iranian actions affected Qatar’s Ras Laffan complex, which is linked to a sizable share of global LNG and helium flows; shortages would affect MRI, aerospace and chip manufacturing. (Industry sources)
• The average 30-year fixed mortgage rate rose to 6.22% last week, after an earlier dip in February; the Fed left its policy range at 3.5%–3.75% citing geopolitical uncertainty. (Federal Reserve)

Background

The current conflict has disrupted maritime routes through and near the Strait of Hormuz, a choke point for global energy shipments. For decades the strait has carried a substantial share of seaborne oil and related cargoes from the Middle East to global markets; interruption translates quickly into tighter crude availability and higher benchmark prices. Many modern supply chains are energy‑intensive: oil and diesel power extraction, processing, manufacturing equipment and the trucks that move finished goods to market.

Global commodity markets are also seasonally sensitive. As the northern hemisphere spring planting season begins, farmers need fertilizer—especially nitrogen-based urea—at known times and volumes. A third of global urea trade moves through the Middle East region and roughly 20% of US fertilizer imports come from Qatar, so delays or stoppages have an outsized effect on costs and availability. At the same time, the airline industry buys jet fuel on global markets, making passenger and freight air services vulnerable to sudden fuel-price spikes.

Main Event

Since the conflict intensified, oil markets have reacted to diminished flows and elevated risk premiums. Retail gasoline in the US climbed to an average of $3.97, up about 30% versus a month earlier, while diesel rose by roughly 50% year-on-year, according to AAA. That diesel increase matters because trucks carry the majority of domestic freight, so higher fuel costs quickly feed into transportation and logistics bills.

Fertilizer traders and farmers report immediate pain: input costs have risen and some supplies are delayed as shipments reroute or are held while countries conserve reserves. The National Corn Growers Association notes that approximately 500,000 US farmers grow corn and depend on timely nitrogen fertilizer applications for yields; price spikes at planting time risk reducing margins and potentially output.

Helium and other specialty gases have been affected after a related disruption at Qatar’s Ras Laffan complex. Qatar is a major liquefied natural gas and helium supplier; interruptions have tightened an already concentrated helium market, which is critical to MRI diagnostics, aerospace testing and semiconductor fabrication. Semiconductor chip production—central to phones, laptops and AI hardware—relies on both helium and stable logistics chains.

Airlines have already responded: the International Air Transport Association recorded a doubling in jet fuel prices since the war began, and United Airlines announced flight cuts taking fuel costs and profitability into account. United CEO Scott Kirby said a sustained price spike could add about $11bn of annual fuel expense for the carrier—a sum far above its best prior annual profit. These commercial decisions translate into fewer seats, higher fares and reduced cargo capacity over coming months.

Analysis & Implications

First-order effects are straightforward: consumers pay more at the pump and transport operators absorb higher fuel bills. Those costs are visible and fast-moving because refined fuel markets price in immediate supply and risk changes. In many cases, governments can tap strategic reserves or subsidize costs temporarily, but such measures are costly and finite.

Second-order effects are broader and slower. Higher energy costs raise manufacturing and distribution expenses for electronics, medical devices and processed foods; chip fabrication facilities use specialty gases and stable power, so disruptions can throttle supply and raise unit costs. Increased fertilizer prices can depress farm incomes or lead to higher retail food prices if producers pass costs to consumers or reduce input use and yields decline.

Financial markets and monetary policy channels also react. The Federal Reserve cited geopolitical risk when it left rates at 3.5%–3.75%, but persistent inflationary pressure from commodity shocks can push longer-term interest rates higher, as reflected in the 30-year mortgage increase to about 6.22%. That outcome tightens consumer spending and housing affordability, potentially slowing growth even as costs rise—a stagflationary risk if the shock persists.

International spillovers matter too: countries dependent on Gulf energy or fertilizer exports face budgetary and food-security stress. Supply diversions and re‑routing increase shipping times and insurance premiums, lifting costs for importers worldwide. Even after a ceasefire, logistical recovery—repaired routes, rebuilt inventories, restored production—typically takes months, which means the peak economic effects lag the military timeline.

Comparison & Data

The table highlights the most immediate and measurable price moves reported since the conflict intensified. While gasoline and diesel show clear month-on-month and year-on-year jumps, other impacts—fertilizer availability, helium constraints and semiconductor lead times—are harder to quantify in real time and typically emerge as inventory shortages or delayed production schedules. Policymakers track both price series and flow metrics (shipments, refinery runs, fertilizer shipments) to assess when to intervene or release reserves.

Reactions & Quotes

White House officials have framed the situation as manageable through diplomacy and market diversification; a senior economic official described active efforts to source alternatives for vulnerable inputs. The administration emphasizes containment of economic fallout even as it seeks to shorten the conflict.

“We’ve been all over the fertilizer problem. I’m not saying that we can eliminate what disruption there is so far, but we can minimize it.”

Kevin Hassett, Director, White House National Economic Council (official)

Policy analysts warn that supply-chain effects will spread beyond fuel prices and may surface in months as orders rotate through production plans. Advocacy groups highlight the unequal burden on low-income households already struggling with basic expenses.

“It’s just a matter of when they work their way through the supply chains. Eventually some of these increases we’ve seen are going to get passed through, if they get large enough.”

Alex Jacquez, Chief of Policy and Advocacy, Groundwork Collaborative (policy group)

Industry leaders have signalled concrete operational responses: airlines cutting frequency, shippers re-pricing routes and some manufacturers delaying non-essential projects until input prices stabilize. Executives emphasize the scale of the cost shock relative to corporate margins.

“If prices stayed at this level, it would mean an extra $11bn in annual expense just for jet fuel.”

Scott Kirby, CEO, United Airlines (corporate statement)

Unconfirmed

• Reports that a full blockade of the Strait of Hormuz will persist for more than three months remain unverified and depend on evolving military dynamics.
• Claims that domestic retail shortages of specific electronics are imminent are not yet confirmed; supply-chain lead times and inventory buffers vary by company and region.

Bottom Line

The conflict has produced clear and rapid energy-price effects visible at the pump and in diesel and jet-fuel markets, with gasoline averaging $3.97 and diesel up roughly 50% year-on-year. Those immediate shocks are likely to ripple through fertilizer, helium-dependent industries and freight costs, raising the risk of higher grocery bills, supply delays and more expensive air travel in the months ahead.

Policy responses—strategic releases, alternative sourcing and targeted support—can blunt short-term impacts, but structural shifts (longer shipping routes, insurance costs, re-sourced suppliers) take time and can leave a prolonged imprint on prices. For consumers already contending with high housing and living costs, the next several months may determine whether these are temporary price blips or a longer inflationary chapter.

Sources

• The Guardian (news report)
• AAA Gas Prices (industry data)
• International Air Transport Association (IATA) (industry association)
• United Airlines press releases (corporate statement)
• Gallup (public-opinion research)
• Federal Reserve (official central bank statements)