SFO Braces for Months of Delays as FAA Cuts Arrivals

San Francisco International Airport is entering a turbulent stretch as a major runway repaving project, new federal safety limits on landings and strong summer demand combine to sharply reduce its capacity and raise the risk of lengthy delays.

Runway work and new safety rules squeeze SFO capacity

A six-month rehabilitation of Runway 1 Right at San Francisco International Airport began this week, redirecting almost all traffic onto the airport’s main pair of intersecting runways, 28 Left and 28 Right. Publicly available construction timelines indicate the work started on March 30 and is scheduled to wrap up around October 2, 2026, keeping one of SFO’s four runways out of service for the entire peak travel season.

At nearly the same time, the Federal Aviation Administration imposed a permanent change to SFO’s operating rules by ending simultaneous approaches to its closely spaced parallel runways in many conditions. National coverage of the decision indicates that the airport’s maximum arrival rate has been cut from about 54 flights per hour to 36, a reduction of roughly one third just as the runway closure takes effect.

Airport presentations and local reports describe the combination of runway construction and new safety limits as a structural reduction in how many aircraft SFO can land per hour, especially during busy morning and evening banks. While the airport has long been vulnerable to delays in fog, wind and winter storms, the tighter federal rules mean that even on clear days the facility will have less room to absorb surges in traffic or minor disruptions.

Officials have previously described the Bay Area’s airspace as among the most complex in the country, with SFO sharing the skies with Oakland, San José and several general aviation fields. Under the new constraints, that complexity may translate more directly into bottlenecks as controllers sequence traffic into a smaller arrival pipeline aimed primarily at the 28 Left and 28 Right runways.

Delay forecasts rise from 10 percent to roughly one quarter of arrivals

Before the FAA’s landing rule change, airport briefings projected that the Runway 1 Right project alone would cause delays for roughly 10 to 15 percent of flights, with typical holds of under 30 minutes concentrated around the morning and late evening peaks. Subsequent statements cited in local television coverage show those projections have now been revised sharply upward.

According to those reports, the FAA has advised that, under the new arrival cap, approximately 25 percent of inbound flights could experience delays of 30 minutes or more while the runway is under construction. That represents a significant jump in disruption, particularly for passengers making tight connections or flying on routes with limited daily frequencies.

Travel industry analyses point out that reduced hourly arrival rates can ripple through the network well beyond the Bay Area. When SFO’s arrival stream is throttled, flights may be held on the ground at origin airports around the country, triggering rolling departure delays that can persist for much of the day. Airlines may also be forced to pad schedules or add slack between rotations to avoid cascading late operations.

How severe the delays become will depend on weather patterns, air traffic staffing and the extent to which carriers spread out their schedules. If fog and coastal winds are relatively light, some of the lost capacity could be offset with smoother flows. A string of summer storm systems, however, could quickly turn the revised projections into a daily reality for travelers.

United Airlines adjusts schedules and operations at its SFO hub

United Airlines, SFO’s largest tenant and primary hub carrier, faces particular pressure as the airport’s capacity shrinks. Public information from the airline shows that SFO anchors a dense network of transcontinental and transpacific routes, along with dozens of regional connections that feed long-haul departures.

Industry coverage indicates that United has been reviewing its schedules in light of the new FAA limits and the construction timeline, a process that can include retiming peak banks, trimming marginal frequencies and shifting some connecting flows through other hubs such as Denver or Los Angeles. These adjustments are intended to reduce the number of flights trying to arrive during the most constrained hours while preserving connectivity for high-value routes.

Operationally, United and other carriers are expected to lean more heavily on tactics such as proactive rebooking, expanded use of day-of-travel notifications and, in some cases, upgauging aircraft to carry similar numbers of passengers on fewer flights. While such steps can soften the blow of a lower arrival rate, they cannot fully erase the impact of losing a runway and parallel-approach capability for months at a time.

Customer-facing advisories from airlines and travel outlets are increasingly urging SFO passengers to build in extra time, avoid tight connections, and consider earlier departures in the day, when schedules are less likely to be backed up by cumulative delays.

Federal efforts to keep traffic moving amid a constrained system

The FAA’s move at SFO is part of a broader pattern of federal intervention at capacity-strained airports. In recent seasons, the agency has initiated scheduling reduction processes at other major hubs, including Chicago O’Hare and Newark Liberty, to bring the number of planned flights more in line with what local airspace and staffing can reliably support.

Public FAA documents describe a toolkit that includes airspace redesign, new arrival and departure procedures, and investments in surface management technology intended to make better use of each available runway slot. At SFO, the agency and airport have previously collaborated on technologies such as ground-based augmentation for navigation and departure metering systems designed to reduce taxi congestion and hold times.

In the short term, the principal federal lever at SFO will be strict control of the hourly arrival rate, particularly during the runway closure. By capping the number of inbound flights, the FAA aims to prevent extreme airborne holding and go-arounds, even if that means more ground delays and schedule adjustments upstream.

Longer term, aviation analysts note that the SFO restrictions highlight the limits of infrastructure that has changed little in physical layout for decades, even as traffic volumes and safety expectations have risen. Any discussion of adding runways or significantly altering the airport’s footprint has historically run into environmental constraints and strong community opposition, leaving procedural fine-tuning and technology upgrades as the primary tools for managing growth.

What travelers can expect through October and how to cope

For passengers, the practical effect of SFO’s constrained operations will be a higher baseline risk of delay, particularly for arrivals, through at least early October 2026. The most vulnerable itineraries are likely to be short connections, evening arrivals that depend on aircraft turning for next-morning departures, and routes that operate only once or twice per day.

Travel experts recommend that passengers transiting SFO build in longer connection times than they might accept at less constrained hubs, and that they favor morning flights, which tend to be less exposed to knock-on disruptions from earlier delays. Those on critical schedules may also wish to consider alternate Bay Area airports where feasible, though those facilities have capacity and access limitations of their own.

Airlines and the airport are expected to publish updated guidance and schedule adjustments as the construction and new safety regime settle into a pattern. Travelers who booked months in advance may see retimed flights, aircraft swaps or rebooking offers as carriers try to align their operations with the lower arrival ceiling.

With a major runway out of service, a stricter federal safety framework in place and summer demand building, SFO is facing what some analysts have described as a perfect storm for delays. How smoothly the season unfolds will depend on how quickly airlines, regulators and passengers adapt to an airport that, at least for now, has less room than usual to keep the system running on time.