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Fuel costs for ​U.S. airlines jumped 78% in April to nearly $6.5 billion ​compared with the year before, as the Middle East conflict drives up jet fuel prices, the U.S. Transportation Department said Monday.

Airlines’ fuel costs were up 26% over March ‌and carriers used 2.6% ⁠less ⁠fuel in April over March, USDOT said in a monthly report.

The cost per gallon ​of fuel in April was $4.11, up $1.81 over April 2025, USDOT added, a trend that ​has already had an impact on the sector. Spirit Airlines, an ultra low-cost U.S. carrier, ceased operations in May, saying rising fuel prices left it ​no choice.

Delta Air Lines, United Airlines, American Airlines ⁠and Southwest ‌Airlines account for about 80% of U.S. domestic flights.