How Bad Are Flight Delays and Cancellations at SFO?

San Francisco International Airport has emerged as one of the most delay-prone major hubs in the United States, with recent federal and industry data showing elevated levels of late arrivals and disruptions compared with many rival airports.

SFO’s On-Time Record in Recent Data

Federal Bureau of Transportation Statistics data for the 12 months from September 2023 through August 2024 indicate that San Francisco International Airport recorded on-time arrivals of roughly 69 to 76 percent, depending on the specific time frame and methodology used to calculate performance. That places SFO near the lower end of the country’s largest airports for punctuality, with roughly one in four arrivals arriving late by the federal definition of more than 15 minutes after schedule.

In a separate analysis of disruption rates covering 2024, travel insurance provider InsureMyTrip reported that SFO had the highest share of delayed flights among major US airports, citing a delay rate just under 30 percent. The same analysis placed SFO in the top tier nationally for both delays and cancellations combined, alongside other large coastal hubs that frequently operate near capacity.

Additional summaries of Department of Transportation data used by business and policy groups show SFO’s on-time performance lagging many peer airports. One compilation ranking large US hubs by on-time arrivals for the period from late 2023 into 2024 positioned SFO roughly in the bottom third, with an arrival on-time percentage below 76 percent and an even lower figure for departures.

SFO’s relative standing contrasts with some regional competitors. An official financial disclosure from the airport’s operator, drawing on federal statistics for January through December 2023, reported domestic on-time arrival rates of 76 percent at SFO compared with 79 percent at Oakland and 81 percent at San Jose. That differential has persisted into 2024, underscoring that while delays are widespread nationally, SFO remains more vulnerable than neighboring Bay Area airports.

How SFO Compares With Other Major US Airports

When stacked against the largest US hubs, SFO is not alone in struggling with punctuality, but the gap is notable. Some national rankings of airport performance based on 2024 and early 2025 federal data show several Florida airports, Chicago Midway and Baltimore/Washington with similar or worse delay percentages. However, SFO consistently appears on lists of the most delay-prone major hubs, particularly when both departures and arrivals are considered.

Analyses derived from the Department of Transportation’s on-time database highlight that SFO’s share of delayed flights rivals or exceeds that of congested East Coast hubs. In many compilations, airports such as Atlanta or Dallas, which handle more total traffic than SFO, still report higher on-time rates. That suggests SFO’s operational environment, rather than sheer volume alone, plays a significant role in its disruption profile.

For travelers, this positioning means that using SFO for tight domestic or international connections carries a greater statistical risk of misconnection than flying through some inland hubs. While individual experiences vary widely, the aggregate data show that flights touching SFO are more likely to depart or arrive late than flights of comparable length through a number of competing airports across the country.

At the same time, SFO’s cancellation rate, while elevated, does not always top national charts. Recent aggregated figures show its cancellation percentage lower than certain East Coast hubs but still high enough to place it within the top ten large US airports for combined delays and cancellations during recent peak travel seasons.

Weather, Runway Capacity and Construction Pressures

Publicly available planning documents from SFO and the Federal Aviation Administration point to a combination of geography and infrastructure as major contributors to the airport’s disruption record. The airport sits on the edge of San Francisco Bay, where low coastal clouds, fog and shifting winds regularly constrain operations. When ceilings drop or visibility is limited, arrival capacity is reduced and spacing between aircraft must increase, cutting the number of landings the airfield can safely handle per hour.

An official SFO bond and financial statement summarizing 2023 performance notes that the airport’s arrival on-time percentage is typically lower than those of Oakland and San Jose in part because of the prevalence of low clouds and fog. Under certain adverse weather conditions, the document explains, the runway configuration requires a reduction in arrival rates, sometimes to around 40 landings per hour, which in turn produces queues of inbound aircraft and rolling delays.

Runway and taxiway construction has intensified these pressures since early 2024. A major taxiway improvement project required the closure of Runway 28 Left for several months, shrinking usable capacity on the airport’s primary west-facing runway pair. The project, described in an SFO press release and related federal scheduling-relief notice, aimed to improve safety and long-term throughput by realigning exit taxiways but has meant extended periods in which the airport operated effectively with a single primary arrival runway during certain conditions.

FAA traffic reports for fiscal year 2024 further underscore SFO’s challenge. A federal summary of core airport delays shows SFO among the national leaders in total delays of at least 15 minutes, with more than 23,000 such events recorded in the year alongside Las Vegas. That level of disruption reflects how weather patterns, construction closures and already tight schedules interact to create broad knock-on effects for airlines using the airport.

Holiday Peaks and Seasonal Patterns

Seasonal surges add another layer to SFO’s reliability problem. A recent analysis of holiday-period performance by a major Bay Area news outlet, based on six years of federal data, ranked SFO 10th worst among the 100 largest US airports for holiday flight delays. The review found that while performance has improved modestly since the height of the pandemic, SFO remains among the most disruption-prone hubs during Thanksgiving and end-of-year travel.

The same coverage indicates that the majority of SFO’s holiday-season delays trace back to factors categorized in federal data as national air system issues. These include non-extreme weather, heavy traffic volumes, airport operations constraints and late-arriving aircraft that cascade into subsequent departures. In other words, SFO’s role as a busy connecting hub means that disruptions elsewhere in the system often materialize as late flights on its runways.

Internal briefings available from SFO’s governing body for spring and summer 2024 anticipate elevated delays during the final stages of the runway and taxiway project, particularly when seasonal marine layers and wind patterns require single-runway operations. Staff presentations cited a material probability that certain peak periods would see average arrival delays exceeding an hour when weather and construction constraints coincided.

Travel-industry analyses have also flagged SFO’s performance during peak vacation months. Rankings compiled for holiday and summer travel in 2024 and early 2025 using Department of Transportation data consistently list SFO among the airports where travelers are most likely to experience significant late arrivals, even if not always at the very top of those national tables.

What the Numbers Mean for Travelers Using SFO

The current data set paints a clear picture for passengers planning trips through San Francisco. With roughly one in four flights running late and some independent analyses placing the delay share closer to 30 percent, SFO presents a higher-than-average risk of disruption, particularly during the winter storm season, spring and summer marine-layer periods and during ongoing airfield construction phases.

Travelers connecting through SFO may want to use that information to build in more buffer time between flights than they might schedule at other hubs. Federal and industry statistics do not dictate the outcome of any particular journey, but they show that tight connections of less than an hour can be vulnerable when arrival rates are reduced or when late inbound aircraft ripple through an airline’s schedule at the airport.

For those originating in the Bay Area with flexibility, publicly released performance comparisons suggest that Oakland and San Jose can offer somewhat better odds of an on-time departure or arrival on many domestic routes, though each airport has its own constraints and limited nonstop options. The choice between SFO’s extensive route network and the relatively higher punctuality at its regional neighbors often comes down to how much weight travelers place on minimizing the statistical chance of a delay.

Looking ahead, SFO officials and federal regulators have framed the runway and taxiway projects as investments intended to support more efficient operations once completed. Combined with broader national efforts to modernize air traffic control technology, those changes may eventually narrow the punctuality gap between SFO and better-performing hubs. For now, however, the latest federal and industry figures make clear that cancellations and delays at San Francisco International remain a significant and ongoing reality for many travelers.