New Study Ranks Worst U.S. Airlines for Delays, Cancellations

New federal data on airline performance is shining a spotlight on which U.S. carriers leave travelers most vulnerable to delays and cancellations, revealing sharp differences between budget and legacy airlines as the busy travel season continues.

Fresh numbers from federal on-time performance reports

Recently released Air Travel Consumer Reports from the U.S. Department of Transportation compile millions of flights to show how each airline performs on punctuality and cancellations. The reports summarize how often flights arrive on time, how frequently they are canceled, and the main causes of delays, including airline operations, weather, air traffic congestion and late-arriving aircraft.

Across the industry, the numbers show an environment where most flights still operate as scheduled, but pockets of poor reliability persist. In one recent reporting period, major U.S. carriers collectively canceled around 2 percent of flights, while more than 20 percent arrived late. Some carriers significantly exceeded those averages, while others performed far better than the field.

Because the federal data covers multiple months and seasons, patterns start to emerge that go beyond a single storm or holiday weekend. That makes the reports one of the clearest benchmarks available for judging which airlines are consistently reliable and which ones struggle to keep their schedules on track.

Low cost carriers dominate worst cancellation rankings

Among large U.S. airlines, ultra low cost carriers frequently appear near the bottom of the rankings for cancellations. In several recent months captured in the federal reports, companies such as Frontier and Spirit recorded cancellation rates that were roughly double or more the overall industry average.

For example, one late 2024 snapshot shows Frontier canceling more than 3 percent of its scheduled flights, while Spirit also posted cancellation rates approaching 4 percent. By contrast, the average for all reporting carriers in that same period was just above 2 percent. These gaps translate directly into higher odds that a trip on those airlines will be disrupted before departure.

Analysts often point to leaner schedules and fewer spare aircraft as factors that can make budget carriers more vulnerable when weather or operational issues arise. With fewer backup planes and crews, a single mechanical issue or storm system can trigger a larger cascade of cancellations compared with airlines that operate bigger fleets and have more flexibility to reassign resources.

Big differences in delay rates, even when flights operate

Cancellations tell only part of the story. Even when flights do depart, some airlines are far more likely than others to arrive behind schedule. Federal statistics break out the share of flights that are delayed because of airline-controlled issues, national aviation system congestion, weather and other causes.

In late 2024 data, JetBlue and several regional operators recorded some of the highest overall delay shares among large and midsize carriers. JetBlue, for instance, was on time for only about 61 percent of flights in one month examined, meaning nearly four in ten flights arrived late. Frontier also posted relatively low on time performance in the same period, with less than two thirds of flights arriving as scheduled.

By contrast, Delta Air Lines and its regional partners routinely landed near the top of the on time rankings. In multiple months of 2024, Delta’s mainline operation posted on time arrival rates close to or above 80 percent, with cancellation rates under 1 percent. Alaska Airlines and Southwest Airlines also generally performed better than the industry average on punctuality and kept cancellations relatively low outside of major weather events.

Regional carriers show some of the highest disruption levels

Beyond the big brands on aircraft tails, several regional airlines that operate flights under names such as American Eagle, Delta Connection and United Express also stand out in the data. These carriers fly smaller jets on shorter routes but are counted separately in federal statistics.

In the October 2024 report, regional airlines including Republic Airways and Endeavor Air posted some of the highest cancellation percentages among all reporting carriers, with numbers near or above 7 percent in certain months. That means travelers on smaller connecting flights may face a noticeably higher risk of having their flight scrubbed than those flying nonstop on mainline routes.

Delay patterns also differ for these operators. Some regional carriers showed respectable on time performance but elevated cancellation rates, suggesting that when schedules come under pressure, flights on thinner routes are more likely to be dropped entirely instead of simply delayed. For passengers, that can mean limited options for rebooking and longer waits for the next available seat.

What the rankings mean for travelers planning trips

For travelers comparing fares, the latest rankings underscore that the cheapest ticket may carry added risk in reliability. An airline with a base fare that is slightly lower but a track record of double the cancellation rate and significantly higher delay odds can easily erase any savings in the form of missed connections, extra nights in hotels or lost vacation time.

Consumer advocates suggest that passengers weigh federal performance statistics alongside price, schedule and frequent flier benefits. A carrier with stronger on time performance and fewer cancellations may be especially valuable for tight connections, important business trips or itineraries involving events that cannot be missed.

The data also highlight the importance of route selection. Nonstop flights operated by high performing mainline carriers generally face fewer points of failure than multi stop itineraries that rely on smaller regional jets. Travelers who have flexibility with departure times and airlines may reduce their disruption risk by choosing routes and carriers with stronger recent records for punctuality.