Airlines worldwide have canceled thousands of flights amid acute jet fuel shortages triggered by the U.S.-Israel war on Iran. The conflict has closed the Strait of Hormuz, disrupting over 20% of global oil supplies and causing jet fuel prices to more than double in recent weeks.

In the U.S., United Airlines became the first major carrier to announce capacity cuts, trimming about 5% of its schedule in the second and third quarters of 2026. The reductions target less profitable routes, including off-peak midweek and overnight flights, as well as service from Chicago O'Hare to Tel Aviv and Dubai. United CEO Scott Kirby stated in a staff memo, "Jet fuel prices have more than doubled in the last three weeks. If prices stayed at this level, it would mean an extra $11 billion in annual expense just for jet fuel."

Overseas, Scandinavian Airlines System (SAS) canceled 1,000 flights in April, primarily short-haul routes in the Nordic region, while Air New Zealand cut 1,100 flights through early May. Vietnam Airlines suspended seven domestic routes starting April 1 and plans further reductions of 10% to 20% if prices climb higher. In Italy, four northern airports, Milan Linate, Bologna, Venice, and Treviso, imposed rationing until at least April 9, limiting short-haul flights to 2,000 liters per aircraft and prioritizing long-haul and medical services.

U.S. jet fuel prices surged 95% from $2.50 per gallon on February 27 to $4.88 on April 2, equivalent to nearly $205 per barrel. Globally, nearly 7% of scheduled flights were canceled on Monday, totaling 7,049 out of 104,618 routes, with 14.6% of North American departures affected. Fuel accounts for 20% to 25% of airline operating costs, prompting fare hikes of up to 24% in recent weeks.

Ryanair CEO Michael O'Leary warned of potential 5% to 10% summer cuts at constrained European airports if the war persists beyond April, as supplies may be disrupted from May. Lufthansa has prepared to ground up to 40 aircraft, and experts predict Europe could face shortages soon after Asia. The International Energy Agency noted that oil losses in April could double those of March, exacerbating scarcity for specialized jet fuel storage.

Delta Air Lines reported $400 million in added fuel costs for March alone, while carriers like Air France-KLM and Finnair have also trimmed schedules. Aviation analysts foresee sustained high prices even if the Strait reopens, due to pent-up demand and offline Middle East production. Travelers face higher fares and reduced options as airlines prioritize profitability amid the crisis.