SFO runway closure and FAA rules keep delays piling up

San Francisco International Airport is heading into the fall with a stubborn backlog of delays, as a long-running runway repaving project and tighter Federal Aviation Administration safety rules continue to squeeze the number of flights that can land and depart each hour.

Runway 1R closure concentrates traffic on crowded parallels

San Francisco International Airport began a six month closure of Runway 1R on March 30, 2026, to repave the surface and upgrade adjacent taxiway infrastructure. Publicly available airport planning documents indicate the project is scheduled to run through October 2, 2026, with a budget of about 180 million dollars for airfield improvements. During the work, SFO is routing all arrivals and departures primarily onto Runways 28L and 28R, the closely spaced parallels that handle most of the airport’s long haul traffic.

According to information posted by the airport and summarized in multiple news and travel advisories, the north side parallel Runway 1L is not being used for regular takeoffs and landings during construction and is instead functioning largely as an additional taxiway. This configuration is intended to keep ground traffic moving around the closed work zone, but it leaves SFO dependent on its two westbound runways for nearly all airline operations during peak hours.

SFO’s own capacity studies show that the airport’s four intersecting runways typically operate near their limits during the busy spring and summer periods. With one runway fully closed and another effectively dedicated to taxi operations, the margin for managing bad weather, late departures, and airspace constraints has narrowed, making the system more prone to backup when conditions deteriorate.

FAA safety limits cut arrival rates on parallel runways

The runway closure is only part of the story. On March 31, 2026, the Federal Aviation Administration introduced new safety restrictions on side by side landings at SFO, following a national review of close parallel operations. Publicly available summaries of the change describe a ban on the traditional simultaneous “parallel visual” approaches on Runways 28L and 28R that had allowed controllers to land two aircraft at nearly the same time in clear weather.

Under the updated procedures, arriving flights now use staggered approaches, with additional spacing between aircraft on the two parallels. Aviation briefing materials and pilot discussions indicate this effectively reduces SFO’s arrival rate from roughly the mid 50s per hour to the mid 30s per hour during many conditions. The tighter limit applies even when skies are clear, which historically has been when the airport could recover from earlier disruptions.

The FAA’s own scheduling guidance for the Summer 2026 season classifies SFO as a Level 2 airport, subject to capacity review and informal schedule coordination. That designation reflects concerns that demand in peak hours exceeds what the current runway layout and safety rules can reliably accommodate, especially while the 1R project is underway.

Ground delay programs turn delays into an all day pattern

With runway work constraining available pavement and FAA rules lowering the hourly arrival ceiling, SFO has appeared on federal airspace status boards with unusual regularity this summer. National Airspace System data show repeated ground delay programs that cap arrivals into SFO at around 36 per hour during morning and evening peaks. When these programs are active, flights are held at their departure airports, accumulating delays well before they ever get near the Bay Area.

Flight tracking feeds and traveler reports point to a pattern in which early morning backups ripple throughout the day. Aircraft that arrive late into SFO often depart late on their next segments, compounding congestion during the afternoon push when transcontinental and international flights compete for limited runway slots. On days with coastal fog or low ceilings, controllers must add even more spacing between aircraft, erasing any chance of catching up.

Passenger accounts shared in public forums describe two hour or longer arrival delays as increasingly common on certain routes, particularly for flights connecting from the Midwest and East Coast. While individual experiences vary, the overall picture is of an airport where even small disturbances translate into prolonged waits when the system is already running close to its reduced capacity cap.

Airport projections show higher share of delayed flights

Before the new FAA landing restrictions took effect, SFO’s published estimates for the Runway 1R project suggested that 10 to 15 percent of flights could see delays averaging under 30 minutes, mainly during the morning and late evening peaks. Subsequent analyses cited in industry coverage now point to a higher impact, with roughly a quarter of arriving flights on some days experiencing delays of at least half an hour while the combination of construction and safety rules remains in place.

Airport planning documents emphasize that the repaving work is required to keep SFO’s operating certificate in good standing and to maintain federal funding for airfield infrastructure. In parallel, the FAA’s revised approach standards are part of a broader safety initiative that applies to multiple airports with closely spaced runways, not just San Francisco. Together, those factors leave limited room for short term relief beyond incremental schedule adjustments by airlines.

Travel industry analyses note that the timing of the six month closure, which spans the busy spring break and summer travel periods into early fall, has maximized the number of passengers affected. Even if the runway reopens on the currently advertised October timeline, the majority of the work is coinciding with some of SFO’s heaviest traffic of the year.

What travelers can expect for the rest of 2026

For passengers, the ongoing combination of runway construction and FAA flow restrictions means that elevated delay risk is likely to persist at least until Runway 1R returns to service in early October. Airline schedule data and federal scheduling notices indicate that carriers have made only modest reductions in planned operations, preferring to absorb longer taxi and holding times rather than cut popular flights outright during the peak season.

Publicly available guidance from travel and aviation outlets generally recommends allowing more buffer time for connections at SFO, especially for evening departures following long haul arrivals that are more vulnerable to upstream delays. Travelers are also urged to pay close attention to day of travel alerts from airlines, as ground delay programs can be issued or extended with little advance notice when coastal weather or traffic patterns shift.

Looking ahead, some industry commentary suggests that the eventual completion of the 1R project could improve long term efficiency by modernizing runway surfaces and simplifying taxi flows. However, there is broad agreement in public discussion that the FAA’s more conservative approach to simultaneous landings will keep SFO’s arrival capacity lower than in previous years, even after construction wraps up, leaving the region’s main international gateway more susceptible to congestion whenever demand surges.

SFO runway 1R closure project overview

FAA Summer 2026 schedule and capacity notice

FAA National Airspace System status for SFO

Background on SFO runway layout and parallel landing changes