Travel/Public Service · NEWS EXPLAINER
Why U.S. airfares may stay high even if jet fuel falls
Airlines plan schedules months ahead and are trimming less-profitable flights, so lower fuel costs may take time to show up in ticket prices.
U.S. travelers waiting for cheaper fuel to pull down airfares may have to wait. A September 28 Associated Press report found that ticket prices remained elevated as jet fuel swung sharply this year, while airlines adjusted schedules and pricing with a lag.
The reason is partly operational: carriers plan capacity months in advance and cannot reprice seats that are already sold when fuel suddenly rises. With American, United and Southwest trimming less-profitable flying, fewer available seats can keep pressure on fares even after fuel prices retreat.
Fuel can fall faster than ticket prices
The Argus U.S. Jet Fuel Index climbed to $4.88 a gallon in early April, fell to $2.70 in June and then rose again to $4.53 on September 17, according to figures cited by AP. It was still $4.30 a gallon on the Friday before the report, nearly twice the 2025 average across the four U.S. markets in the index.
Airline pricing does not reset at the same speed. Carriers decide how many flights and seats to offer months in advance, and many tickets are already sold before a fuel spike arrives. That creates a lag between a change in fuel costs and any sustained change in fares.
Capacity cuts can keep seats expensive
Reuters reported on September 16 that American, United and Southwest were scaling back planned schedules after the fuel surge. United removed some December flights and said further reductions could follow in 2027, while Southwest roughly halved its planned 2026 capacity growth.
American said the latest fuel increase would add about $1 billion to its fourth-quarter costs. When airlines remove weaker flights instead of adding seats, the supply of tickets on affected routes can stay tight even if fuel later becomes cheaper.
For travelers, cheaper fuel is not an instant fare signal
The AP report said August U.S. airfares were 23% above a year earlier and cited Hopper estimates of $402 for an average Thanksgiving domestic round trip and $452 for Christmas. Those figures describe fares observed in searches, not a guarantee for every route or traveler.
The practical takeaway is limited but useful: a drop in jet fuel is not a promise that a specific ticket will get cheaper right away. Route demand, how much capacity an airline has already scheduled and how many seats are still unsold can matter as much as the latest fuel quote.
