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New analysis of federal on-time performance data highlights 30 major US airports where departing flights are most likely to leave late, underscoring how congestion, weather and network design continue to shape the passenger experience in 2024 and 2025.
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How the ranking of delay prone airports was built
The latest ranking draws primarily on departure statistics from the US Department of Transportation’s Bureau of Transportation Statistics and the Air Travel Consumer Report, which track when flights push back from the gate compared with their scheduled time. Publicly available tools that sit on top of this dataset, including airport on time rankings and independent dashboards, were used to isolate the largest US commercial airports and rank them by the share of departures that left 15 minutes or more behind schedule in the most recent 12 to 24 month window.
To keep the comparison focused on airports that handle significant passenger volumes, the list is limited to large and medium hubs as classified by the Federal Aviation Administration, roughly corresponding to the 30 busiest centers of domestic air traffic. This means that while smaller regional fields can have high delay percentages, the emphasis here is on where late departures affect the greatest number of travelers.
Because airline schedules and weather patterns shift over time, analysts typically rely on a rolling 12 month period rather than a single stormy month or holiday peak. The sources used for this ranking aggregate tens of millions of flights from mid 2024 into mid 2025, smoothing out short lived disruptions and providing a clearer picture of chronic delay performance at each airport.
Departure delay rates are closely correlated with arrival delay statistics published by the same federal sources, but they are not identical. For travelers deciding where and when to fly, watching the departure side of the ledger can be particularly useful, since late pushbacks often cascade into missed connections and curtailed evenings at the final destination.
The airports topping the delay tables
According to compiled federal data and recent independent analyses built on that dataset, San Francisco International Airport (SFO) currently sits near the top of the list among major US airports for delayed departures, with close to three in ten flights leaving late in the latest full reporting period. Persistent coastal fog, a closely spaced parallel runway configuration and heavy long haul traffic make it difficult for the airport to maintain scheduled throughput, especially during peak periods.
Las Vegas Harry Reid International Airport (LAS) also ranks among the most delay prone departure points. Recent figures presented in Federal Aviation Administration summaries show that LAS has recorded some of the highest counts of departure delays of at least 15 minutes among the country’s core hubs, reflecting the strain of rapid growth in leisure travel and afternoon thunderstorms that frequently slow departures from the desert field.
On the East Coast, New York’s primary international gateways play an outsized role in the ranking. John F. Kennedy International Airport (JFK) and Newark Liberty International Airport (EWR) both appear in the upper tier of the 30 airport list, with a significant share of their flights departing late. High traffic density in the Northeast corridor, constrained runway layouts and complex international bank structures all contribute to bottlenecks whenever thunderstorms move through or air traffic control programs are put in place.
Orlando International Airport (MCO) is another major hub that consistently appears in the top tier of delayed departure rankings. Its heavy dependence on leisure and theme park traffic concentrates departures into a relatively tight set of peak hours, which can quickly overwhelm available ramp and runway capacity when summer storms form over central Florida.
Other big name hubs with elevated delay risk
Beyond the headline grabbing coastal and sunbelt airports, a number of other major hubs register above average departure delay rates in the latest cross airport comparison. Chicago O’Hare International Airport (ORD), Denver International Airport (DEN) and Dallas Fort Worth International Airport (DFW) routinely handle some of the nation’s highest flight counts, and their on time performance tends to fluctuate with seasonal weather and the operational strategies of dominant carriers.
O’Hare in particular has long been associated with cascading delays that ripple across the national network. Federal performance tables show that while Chicago has benefited from recent runway reconfiguration projects, its status as a central connection point means that minor schedule disruptions can quickly expand into longer departure queues during busy evening banks.
In the Southeast, Miami International Airport (MIA) and Atlanta Hartsfield Jackson International Airport (ATL) appear in the middle of the 30 airport ranking, with moderate but still notable departure delay rates. ATL remains one of the more efficient mega hubs when measured purely by percentage of on time operations, but its sheer volume means that even a relatively low delay share translates into a high absolute number of late departures in any given year.
Meanwhile, several airports in Texas and the Mid Atlantic, including Houston’s George Bush Intercontinental Airport (IAH), Charlotte Douglas International Airport (CLT) and Washington Reagan National Airport (DCA), show elevated levels of departure delay compared with more lightly used facilities. Summer thunderstorms, slot and airspace constraints and heavy banked schedules all play a part in pushing them into the consolidated top 30 list.
Why some airports are more delay prone than others
Experts who work with the DOT and FAA datasets point to a mix of structural and operational factors behind the concentration of delayed departures at specific hubs. Geographic exposure to thunderstorms and coastal fog, as in Florida and Northern California, limits the number of days in which airports can run at peak capacity. When capacity drops, departure queues lengthen and even flights that are mechanically ready to go must wait for their turn in the sequence.
Runway and taxiway layouts also play a role. Airports with intersecting runways or limited high speed exits tend to move traffic more slowly during peak periods than those with widely spaced parallel runways and modern surface movement systems. Several of the airports high on the delay ranking, including SFO and some New York area fields, face long term physical constraints that make major expansions difficult.
Network design and airline scheduling strategies add another layer of complexity. Banked hub structures, common at large connecting airports, concentrate departures into intense waves designed to maximize connection opportunities. While this approach is efficient on paper, it leaves little room to absorb disruptions without triggering rolling delays, especially late in the day when aircraft and crews are already operating close to their maximum duty limits.
Finally, strong demand growth in leisure focused markets since the pandemic has outpaced some airports’ ability to expand gate and terminal capacity. In places such as Las Vegas and Orlando, carriers have added flights to capture tourism demand, even as ramp space and supporting infrastructure have struggled to keep up, a mismatch that shows up clearly in departure delay statistics.
What travelers can do with the new delay rankings
For passengers planning trips through the 30 most delay prone major US airports, the latest rankings are less a reason to avoid entire regions than a prompt to adjust expectations and build more resilience into itineraries. Analysts who work with federal on time performance data consistently find that early morning departures have a much lower probability of leaving late than flights scheduled in the late afternoon and evening, after a full day of minor disruptions has accumulated.
Travelers connecting through high ranking delay hubs such as SFO, LAS, JFK or MCO may want to opt for longer connection windows, particularly during summer thunderstorm seasons or winter weather periods. Building in an extra hour between flights can substantially reduce the risk of missed onward legs without requiring a complete rethinking of routing options.
The data also suggest that where multiple airports serve the same metropolitan area, choosing the less congested alternative can improve on time odds. In some regions, secondary airports have materially better departure performance than the primary international gateway, even if they offer fewer nonstop destinations. Publicly available performance dashboards make it possible for travelers to weigh those tradeoffs in a more informed way.
Ultimately, the new ranking of 30 major US airports with the most departure delays provides another lens on a long running challenge in the national air transportation system. While individual airlines and airports continue to invest in technology and infrastructure, the combination of crowded skies, volatile weather and intense demand means that late departures are likely to remain a defining feature of peak travel periods for years to come.
Bureau of Transportation Statistics: Airline On-Time Tables
US DOT Air Travel Consumer Reports
FAA Air Traffic by the Numbers