Last spring, a round-trip ticket from New York to Los Angeles ran about $280 on most booking platforms. This May, the same seat on the same route costs closer to $370. The jump is not unique to that corridor. Across hundreds of domestic city pairs, airfares have climbed sharply, and the single biggest driver is a commodity most passengers never think about until it hits their wallet: jet fuel.
According to Hopper’s Consumer Airfare Index, the average domestic round-trip ticket this spring sits at roughly $365, up about 24% from the same booking window in 2025. That increase tracks almost in lockstep with jet fuel prices, which have climbed an estimated 84% since hostilities involving Iran began disrupting global oil shipping routes in late 2025, according to monthly spot-price data from the U.S. Energy Information Administration. For a family of four planning a summer trip, that translates to roughly $340 more in airfare alone compared with a year ago.
“We are seeing the fastest year-over-year fare acceleration since the post-pandemic rebound in 2022,” said Hayley Berg, lead economist at Hopper. “Fuel is the dominant factor, but strong demand means airlines have no reason to eat the cost.”
What federal data actually shows
The most authoritative source on what Americans pay to fly is the Bureau of Transportation Statistics, which tracks completed transactions rather than listed prices. The BTS reported that the annual average domestic itinerary fare for 2025 was $387, a slight decline from an inflation-adjusted $394 in 2024. That figure includes taxes and mandatory fees but excludes baggage charges and seat upgrades.
The agency’s fourth-quarter 2025 fare tables add a more granular layer. By late 2025, fares on many routes had already started ticking upward compared with earlier quarters, though they remained below the inflation-adjusted peak of $421 set in 2014. The Q4 data captures the period when fuel costs were accelerating but had not yet reached their current levels.
Here is the critical caveat: no federal data covers 2026 yet. The BTS Q1 2026 average fare report is not scheduled for release until July 15, 2026. Until then, the $365 figure comes from commercial platforms like Hopper that sample listed prices rather than completed purchases. Those estimates are directionally useful but can diverge from official numbers because they weight routes, cabin classes, and booking windows differently. The BTS air fare statistics page explains how its methodology differs from what consumers see in real-time search results.
The fuel factor
Jet fuel is typically an airline’s largest or second-largest operating expense, often accounting for 20% to 30% of total costs. The EIA’s monthly data on U.S. Gulf Coast kerosene-type jet fuel spot prices confirms a steep trajectory through at least May 2026. The precise percentage increase depends on which pre-conflict month serves as the baseline, but the overall direction is unmistakable: carriers are paying dramatically more to fill their tanks than they were before the Iran conflict tightened global crude supply.
How much of that cost reaches passengers depends on several variables. Major carriers like Delta, United, and Southwest use fuel hedging contracts to lock in prices months ahead, which can delay or soften the pass-through. Airlines also adjust by trimming capacity on less profitable routes, pushing passengers onto fuller flights where per-seat fuel costs are lower. Delta, for instance, added a fuel surcharge of up to $30 per round trip on transcontinental routes in May 2026, while United raised base fares on several hub-to-hub corridors by roughly 15% compared with the same period last year. Southwest, which historically avoids surcharges, instead pulled capacity from smaller markets to concentrate flights on higher-demand routes where it can fill more seats.
The pricing impact is uneven. Competitive corridors like the Northeast-to-Florida shuttle tend to see smaller increases because multiple airlines fight for the same passengers. Routes served by only one or two carriers have more room to pass costs along. That variation is one reason a single national average can feel misleading to someone booking a specific trip.
Demand is not backing down
Higher prices have not, so far, discouraged Americans from flying. TSA checkpoint data through spring 2026 shows passenger volumes running at or above year-ago levels, suggesting that pent-up travel appetite and a still-solid job market are keeping planes full. Airlines for America, the industry trade group, projected before the summer season that U.S. carriers would transport a record number of passengers between Memorial Day and Labor Day.
“People are still prioritizing experiences over things,” said Scott Keyes, founder of the fare-tracking service Going. “Even with fares up 20-plus percent, we are not seeing the kind of booking pullback that would force airlines to discount.” Strong demand gives carriers less incentive to absorb fuel costs quietly. When planes are full, airlines can raise fares without losing passengers to competitors or to the couch. That dynamic helps explain why the increases have been so swift: the usual market check on pricing, the point where travelers simply stop buying, has not kicked in yet.
A data transition adds confusion
Comparing 2026 fares to earlier years is about to get more complicated for a reason that has nothing to do with fuel. BTS is shifting to a new ticket sampling program called OD40, which expands its survey from a 10% sample of origin-destination tickets to 40%, effective July 1, 2025. A fourfold increase in sample size could shift measured averages in ways that reflect methodology, not actual price changes.
If OD40 captures a broader mix of deep-discount fares or premium cabin purchases, the resulting national average could move in either direction for purely statistical reasons. That matters because headlines about “record fares” or “biggest jump in years” could end up conflating a real fuel-driven increase with a measurement artifact. Anyone comparing Q3 or Q4 2026 data to pre-OD40 quarters should watch for that distinction.
Stretching a travel budget in a high-fare summer
Waiting for perfect federal data is not practical for anyone trying to book a summer flight in June 2026. The good news is that the fare environment, while elevated, still rewards a few deliberate choices. Tickets purchased six to eight weeks in advance consistently cost less than last-minute bookings on both Hopper and Google Flights, and choosing a Tuesday or Wednesday departure over a Friday or Sunday flight can trim another $30 to $60 from the total. Prices for the same route can also vary by $50 to $100 depending on whether a traveler searches through an airline’s own site, Google Flights, or an online travel agency, so checking multiple sources takes minutes and can yield real savings. Alternate airports offer another lever: flying into Oakland instead of San Francisco, or Burbank instead of LAX, often shaves costs on routes where low-cost carriers compete. Setting fare alerts through Hopper or Google Flights can catch periodic airline promotions automatically, especially for midweek or shoulder-season seats. None of those moves erase an 84% spike in jet fuel costs, but stacked together they can narrow the gap between what airlines want to charge and what a household budget can absorb.
Summer 2026 fares hinge on oil prices and the Iran conflict
The trajectory of airfares for the rest of 2026 hinges on two forces outside any traveler’s control: the price of oil and the strength of consumer demand. If the Iran conflict escalates further or OPEC+ tightens supply, jet fuel could climb higher still, and airlines would almost certainly pass more of that cost along. If diplomatic progress eases supply fears, fuel prices could retreat and take some pressure off fares.
On the demand side, a weakening job market or a broader economic slowdown could cool travel appetite enough to force airlines into discounting. As of late May 2026, neither scenario appears imminent. The most likely near-term outcome is that summer fares stay elevated, with the sharpest increases concentrated on popular leisure routes during peak weeks.
The BTS Q1 2026 report, due July 15, will be the first official check on whether the $365 estimate holds up across the full domestic system. Until that data arrives, travelers are working with incomplete numbers and higher costs. That combination rewards flexibility, early planning, and a healthy skepticism toward any single fare figure presented as gospel.
Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
