SFO runway work and FAA limits keep delays piling up

Flight delays at San Francisco International Airport are expected to remain elevated for weeks as a major runway construction project and new Federal Aviation Administration arrival restrictions continue to limit the number of planes that can land each hour.

Runway 1R closure shifts more traffic to SFO’s main pair

San Francisco International Airport closed Runway 1 Right on March 30, 2026, for a six month repaving and taxiway improvement project, concentrating nearly all takeoffs and landings onto the busy 28 Left and 28 Right runway pair. According to airport construction notices and federal aeronautical publications, the runway is scheduled to return to service around October 2, 2026, following pavement rehabilitation and related safety upgrades.

With 1 Right out of use, SFO has lost one of its key tools for separating arrival and departure flows in normal west wind conditions, when aircraft typically land on the 28s and depart on the 1s. Published construction and planning documents from the airport and the FAA show that the project is part of a broader program to modernize runway safety areas and lighting systems across the airfield, work that cannot be easily compressed into shorter windows without affecting traffic.

Recent federal airport status pages indicate that during the closure period, SFO Tower has been relying on 28 Left and 28 Right for both arrivals and departures, using remaining Runway 1 Left primarily as a taxiway in peak periods to move aircraft between terminals and the departure queue. That configuration reduces flexibility when traffic surges, weather deteriorates, or upstream flow restrictions from other regions push banks of arrivals into tight windows.

Federal construction impact reports circulated earlier this year highlighted SFO as an airport with reduced capacity and likely delay impacts during 2026 because of overlapping projects on runway and taxiway corridors. The runway 1 Right work has now moved from a planning scenario to an operational constraint that passengers are experiencing on departure boards and in longer tarmac waits.

FAA limits parallel landings, cutting arrival rate by a third

On top of the runway shutdown, the FAA has imposed new limits on certain types of closely spaced parallel approaches to SFO’s 28 Left and 28 Right runways. Aviation community discussions and summaries of the federal directive describe a ban on the visual parallel landings that previously allowed the airport to land as many as 54 arrivals per hour in good weather.

Publicly available information from FAA related channels indicates that after the change, the typical arrival rate into SFO in clear conditions has dropped to about 36 aircraft per hour, a reduction of roughly one third. The agency’s safety review focused on the tight 750 foot spacing between the two main runways, which no longer met updated standards for some visual approach procedures that had been used for years to keep traffic flowing.

The practical effect is that even on sunny mornings with light winds, the arrival stream into SFO now backs up more quickly than it did in previous years. FAA traffic management advisories over the past week have repeatedly referenced ground delay programs and flow restrictions into the Bay Area when low clouds, rain, or other en route constraints further compress the airport’s already reduced arrival capacity.

These federal limits are separate from, but compounded by, the local construction projects on the airfield. Aviation data shared by enthusiasts and analysts shows that the capacity reduction and runway closure have coincided with some of the busiest travel months of the year, raising the likelihood that even minor disruptions translate into multi hour delays for connecting passengers.

Average delays climb, with ripple effects across the network

According to newspaper analysis and aggregated federal on time performance data cited in public discussions, SFO’s average gate arrival delay between early April and mid June 2026 increased to roughly 20 minutes, up from about 5 minutes over the same period in 2025. That fourfold jump came after both the FAA order and the runway 1 Right closure took effect, signaling that the dual constraints have pushed the airport to the top of national delay rankings.

Commentary based on Department of Transportation reports indicates that only about half of flights into SFO during some recent months have been arriving within 15 minutes of schedule, well below typical performance at other large U.S. hubs. Travelers report that midday and early evening banks have been particularly vulnerable, as arrival streams from multiple regions converge on a more limited set of landing slots.

FAA air traffic command advisories in early September reference SFO arrival delays of up to 30 minutes tied to low ceilings and constrained runway use. On more challenging days earlier in the summer, online flight tracking data and traveler accounts have described ground delay programs with holds exceeding two hours when fog, thunderstorms elsewhere in the system, or equipment outages overlapped with the structural limitations on landing rates.

The impact is not confined to the Bay Area. Airlines that rely on SFO as a transcontinental and transpacific hub have had to pad schedules, build in longer connection times, and divert some traffic to alternative gateways when delay forecasts surge. Those adjustments can cascade to airports across the country as aircraft and crews miss their planned turns.

Airport alerts point to ongoing disruption through early October

Travel alerts on SFO’s official website and related public notices state that the combination of reduced FAA arrival rates and runway construction is expected to generate delays of at least 30 minutes on roughly 30 percent of arriving flights. The same notices point to early October 2026 as the target for reopening the affected runway and restoring some of the airfield’s lost capacity.

Recent FAA construction and airfield status bulletins list work on Runway 1 Right and adjacent taxiway segments extending through mid November for some associated projects, although the primary six month closure window for the runway itself is still described as ending in the first days of October. Industry observers note that even after the pavement is complete, additional certification and safety checks will be required before the runway can handle regular traffic.

For now, the airport is advising travelers through public channels to monitor their flight status closely, arrive early, and be prepared for gate holds or airborne holding patterns while arrival flows are metered into the constrained arrival stream. Airlines have been adjusting schedules gradually as the full impact of the new FAA rules becomes clear, but many summer and early fall departures were planned before the extent of the flow restrictions was fully reflected in published timetables.

Once runway 1 Right returns to service and carriers incorporate the lower arrival rates into winter schedules, some analysts expect average delays to moderate from current levels. But with the FAA’s updated parallel approach limits remaining in place beyond the construction window, SFO may not regain the peak arrival capacity it enjoyed in previous years, particularly during the busiest holiday travel periods.

What travelers can expect in the weeks ahead

Forecast tools on FAA and airline websites suggest that SFO will continue to see episodic ground delay programs whenever clouds, wind shifts, or traffic surges push demand beyond the reduced landing capacity. Early morning and late night flights may experience fewer disruptions, while mid day and evening banked operations remain more at risk for significant holds.

Passengers connecting through SFO in September and early October are likely to face tighter margins for making onward flights, particularly if their inbound trips originate from cities already subject to en route flow restrictions. Some travelers and local commentators have pointed to nearby Oakland International and San Jose Mineta as alternatives for point to point Bay Area trips that do not require SFO’s extensive long haul network.

Published airport planning documents and prior construction cycles indicate that major runway projects at SFO tend to be bundled into intense multi month windows rather than spread over many years, allowing the airport to complete safety critical work while accepting a temporary deterioration in on time performance. With the current effort overlapping a nationwide safety review of approach procedures, the resulting delay levels have been sharper than in many past construction seasons.

As the six month closure period for runway 1 Right nears its scheduled end and airlines prepare winter schedules under the new FAA rules, the coming weeks will show whether SFO can stabilize delays at a more manageable level or whether the combination of structural constraints and seasonal weather will keep the airport near the top of national delay statistics into 2027.