The Mismatch Between Pump and Ticket
Passengers booking flights across the United States face an uncomfortable reality: cheaper jet fuel does not translate into cheaper seats, at least not for months. Economists and airline executives agree that the relationship between what carriers pay for fuel and what travellers pay for tickets operates on a delay, sometimes stretching half a year or longer.
Brett House, an economist at Columbia Business School, points to the mechanics of airline operations. Schedules and capacity get locked in months ahead of departure. Tickets go on sale even earlier. Once a seat is sold, the price cannot be adjusted upward if fuel suddenly becomes more expensive. That asymmetry creates caution among carriers when fuel markets swing.
Jet fuel behaved erratically this year. The Argus U.S. Jet Fuel Index climbed to $4.88 per gallon in early April, dropped to $2.70 in June, then climbed again to $4.53 by mid-September, according to industry tracking. On 28 September, the average across four US markets sat at $4.30 per gallon, nearly double the 2025 baseline.
Meanwhile, the average domestic base fare rose from $405 in the final quarter of 2025 to $428 in the first three months of this year, then to $436 between April and June, according to the Bureau of Transportation Statistics. Those figures exclude optional add-ons such as baggage and seat selection.
Why Volatility Hurts More Than Price Alone
House argues that instability in fuel markets matters as much as the absolute cost. Airlines build their financial models around expected expenses, and violent swings make those projections unreliable. When fuel spikes after tickets have already been sold, carriers absorb the loss. When fuel falls, they hesitate to cut fares immediately, wary that another surge could follow.
Mike Leskinen, chief financial officer at United, told investors in mid-September that roughly 35 per cent of the carrier's seats for the final quarter were already booked before fuel prices climbed again. The airline cannot retroactively increase those fares, he explained, and expects to recover higher fuel costs gradually through future revenue.
"I don't actually care if it stays high," Leskinen said at an investor conference on 16 September. "I just need it to stabilise."
Stephen Treanor, a finance professor at California State University, Chico, who studies airline exposure to fuel risk, says prices need to fall and remain low before fares follow. A temporary dip does not trigger fare cuts if carriers believe another spike is imminent.
The Global Fuel Squeeze
The disruption extends well beyond US borders. The International Air Transport Association reported that global jet fuel averaged $99 per barrel on 27 February, the day before conflict began in Iran. By early April, that figure had more than doubled to $209. Prices then declined for nearly three months before climbing back to $195 per barrel by mid-September, according to IATA data sourced from S&P Global Energy Platts.
Refinery damage in the Middle East and Russian facilities has tightened supply. Diesel and jet fuel compete for the same refinery output, so shortages in one push up prices for both. IATA projects that fuel will account for nearly one-third of airline operating expenses this year, up from roughly a quarter in 2025.
Devon May, chief financial officer at American Airlines, told the same investor conference that every cent per gallon adds approximately $10 million to the carrier's quarterly fuel bill. The latest increases, he estimated, would add around $1 billion to American's fourth-quarter costs.
Schedules Shrink, Last-Minute Fares Soar
American, United and Southwest have all announced further cuts to their schedules, focusing on routes that were already marginal before fuel costs climbed. United pulled some December flights and warned of deeper reductions in 2027 if fuel remains expensive. American said it now expects slower growth next year than it projected earlier in 2026.
Travellers searching for holiday seats are encountering the steepest fares in a decade. Hopper, a travel-booking firm, reported on 28 September that round-trip domestic fares for Thanksgiving averaged $402 and Christmas fares $452, up 31 per cent and 23 per cent respectively from 2025.
Last-minute bookings carry an even heavier penalty. Deutsche Bank analysis showed that the average same-day, one-way domestic fare on Allegiant Air jumped 21 per cent in a single week, reaching $280 on 18 September. For American Airlines, the comparable same-day fare was $463, up 6 per cent over the same period.
In August, US airfares stood 23 per cent higher than a year earlier, according to the Labor Department.
The Wait Could Outlast the Crisis
House warns that passengers hoping for relief should not expect it soon. Even if fuel prices stabilise or decline, the lag built into airline planning cycles means fares will remain elevated through the final months of this year and likely well into 2027.
The mechanics are straightforward: airlines price tickets based on expected costs at the time of sale, not the cost on the day of departure. When fuel is volatile, carriers build in a buffer. When fuel falls, they wait to see if the drop holds before adjusting fares downward. That caution, combined with the months-long gap between schedule planning and actual flights, creates a delay that can outlast the original shock.
For travellers, the implication is clear. Lower fuel prices at the refinery do not mean cheaper tickets at the gate, at least not for months. The mismatch between what airlines pay and what passengers see reflects the operational reality of an industry that plans far in advance and reacts slowly to market changes, particularly when those changes swing in both directions.
