US Airline Fuel Costs Jump 78% Year-Over-Year as Iran War Keeps Jet Fuel at Record Highs

The conflict in the Middle East that began on February 28, 2026 with US-Israel strikes on Iran has fundamentally reshaped the economics of air travel. The closure of the Strait of Hormuz disrupted a critical oil transit route, sending crude oil above $100 per barrel and triggering a cascade of price increases across the global aviation fuel supply chain.

According to the US Department of Transportation's Bureau of Transportation Statistics (BTS), American scheduled service airlines spent $6.47 billion on jet fuel in April 2026, up 78% compared to April 2025 ($3.63 billion) and up 26.2% from March 2026 ($5.12 billion). The average cost per gallon reached $4.11 in April, compared to $2.31 a year earlier, an increase of 78.2%. Meanwhile, airlines consumed 2.6% less fuel than in March, reflecting ongoing capacity cuts as carriers trim unprofitable routes.

Before the war began, jet fuel in the US averaged around $2.50 per gallon. By early April, prices in major hubs such as Chicago, Houston, Los Angeles and New York surpassed $4.88 per gallon, according to the Argus US Jet Fuel Index published by Airlines for America. That nearly doubles the pre-conflict baseline in under six weeks.

The cost surge has had a direct and measurable impact on airfares. The US Travel Association's Travel Price Index for April 2026 shows airline fares rose 20.7% year-over-year, the first time the category has exceeded 20% annual growth since the post-pandemic fare recovery period. Domestic economy ticket prices averaged $570, up 21% from a year earlier, while international round-trip fares climbed even more sharply, reaching an average of $1,097 per trip, a 42% increase since before the war started, according to booking platform Kayak.

Major US carriers have responded by cutting capacity. United Airlines was the first to act, announcing it would reduce roughly 5% of planned routes during the second and third quarters of 2026, targeting midweek and red-eye flights as well as services to Tel Aviv and Dubai. CEO Scott Kirby warned employees in March that sustained prices at current levels would add $11 billion to United's annual fuel bill alone, exceeding the airline's best-ever annual profit. United is targeting a 15-20% increase in yields to offset costs.

American Airlines, Delta and Southwest have also revised their outlooks. Delta flagged up to $2 billion in additional fuel spending in 2026. Southwest posted a first-quarter profit of $227 million but acknowledged fuel represented a $1 billion headwind in the second quarter alone. Spirit Airlines ceased operations entirely on May 2, 2026, and a group of ultra-low-cost carriers including Frontier and Allegiant sought $2.5 billion in government assistance to weather the crisis.

The pressure extends well beyond US borders. The International Air Transport Association (IATA), which represents over 370 airlines covering roughly 85% of global air traffic, slashed its 2026 industry net profit forecast from $41 billion to $23 billion at its annual general meeting in Rio de Janeiro on June 7-8, 2026. The global airline fuel bill is now expected to hit $350 billion in 2026, up from $252 billion in 2025, with fuel accounting for more than 31% of total operating costs. IATA Director General Willie Walsh stated that average jet fuel prices are forecast to be 70% higher year-on-year, adding $100 billion to the industry's collective fuel costs.

Middle East airlines face the steepest losses. Regional passenger demand is forecast to fall 11.4% in 2026, while net margins are expected to drop to minus 6.1%, compared to a positive 9.4% in 2025. Gulf carriers such as Emirates, Qatar Airways and Etihad have faced the greatest disruption following near-complete airspace shutdowns at the start of the conflict. European carriers are not immune: Lufthansa expects 1.7 billion euros in additional fuel costs for the year, while Ryanair CEO Michael O'Leary has warned of potential airline failures if prices remain elevated through the summer.

The situation continues to evolve. Flight cancellations surged in early April to nearly 7% of all global scheduled routes on some days, compared to 4.7% on the equivalent day in 2025. As of early June, the war shows no sign of resolution, and both IATA and individual carriers have noted deep uncertainty about demand patterns beyond the summer peak season.