SFO runway closure and FAA limits keep delays mounting

San Francisco International Airport passengers are being warned to expect persistent delays as a major runway closure and federal limits on arrival rates continue to constrain traffic through at least early October 2026.

Runway 1R shutdown shifts all traffic to main pair

San Francisco International Airport began a six month closure of Runway 1 Right on March 30, 2026, to repave the surface and upgrade adjacent taxiway infrastructure. Airport construction notices describe the roughly 180 million dollar project as a full rehabilitation of the north south runway, with more than half of the cost supported by Federal Aviation Administration funding through infrastructure grants.

Publicly available airport briefings and notices to air missions state that Runway 1R is scheduled to remain out of service until early October, with a target reopening date of October 2, 2026. During this closure, SFO Tower is routing all takeoffs and landings onto the primary west facing runways 28 Left and 28 Right, while Runway 1 Left is being used as an auxiliary taxiway to help move aircraft on the ground more efficiently.

Airport construction phasing documents show that this configuration is part of a multi year airfield rehabilitation program. By concentrating both departures and arrivals on the 28 runways, SFO has effectively reduced its peak capacity, especially during busy bank periods when flight schedules were originally built around four available runways.

In financial disclosures published this summer, the airport forecast that approximately 15 percent of flights through October 2026 would be affected by runway construction. Those same documents caution that the forecasted impact assumes cooperative weather and no further constraints beyond the current federal air traffic management limits.

FAA arrival restrictions cap hourly traffic

On top of the physical runway work, San Francisco is operating under reduced arrival rates imposed by the Federal Aviation Administration. According to an alert published by SFO in June, FAA flow control measures are limiting the number of flights that can land each hour, a step that the airport links directly to increased delays on inbound traffic.

Advisories from the FAA Air Traffic Control System Command Center show repeated ground delay programs for SFO in recent months, often citing constrained arrival capacity on the 28 runways. These programs assign controlled departure times from origin airports in order to cap the number of aircraft converging on San Francisco at once, which pushes many delays to the departure end of a trip rather than only on final approach.

Air traffic management references describe these ground delay programs as a tool used when the scheduled demand for arrivals exceeds the reduced airport arrival rate. For SFO, the combination of ongoing runway work and stricter approach spacing has lowered that rate compared with past years, meaning that peaks in the daily schedule regularly exceed what controllers are currently permitted to accept.

Recent FAA summaries also note separate weather related initiatives at SFO, including arrival delays tied to low ceilings and coastal fog. While those events are typical for the Bay Area, they now interact with a more delicate operating environment in which there is less runway and procedural flexibility to absorb disruptions.

Parallel landing rules add another constraint

The runway 1R closure has coincided with tighter federal rules on the use of closely spaced parallel approaches at San Francisco. Aviation community discussions and local coverage report that, earlier this year, the FAA curtailed the side by side visual approaches that historically allowed SFO to land more than 50 aircraft per hour on runways 28L and 28R in clear weather.

Since the change, SFO has been relying more heavily on instrument approach procedures that require greater spacing between arriving aircraft, especially when construction or weather limit available options. Informal analyses shared by aviation observers suggest that, on a typical day, the effective arrival rate has fallen to the mid 30s per hour, well below the demand written into airline schedules during peak banks.

Local transit and airline forums have chronicled a sharp increase in average delay times since the runway project and federal restrictions took effect. Posts referencing a review of Department of Transportation data indicate that average delays at SFO have roughly quadrupled compared with the same period in 2025, with roughly half of the increase attributed to runway construction and half to the new federal arrival limitations.

While the FAA has recently begun to adjust some of the parallel approach rules, published advisories still show frequent traffic management initiatives for SFO. That pattern points to a continuing gap between current runway capacity and scheduled demand, even in periods of favorable weather.

Ongoing impact for airlines and travelers

The combined effect of runway work and FAA restrictions is now visible in both airline operations and traveler experiences. FAA delay summaries for late summer show San Francisco appearing regularly among the nation’s most constrained major airports, often under active ground delay programs during morning and evening rush periods.

Travelers have described multi hour holds on inbound flights as SFO bound aircraft wait for release slots from their departure airports. Some airlines have issued general advisories warning that connections through San Francisco may be tight, and consumer facing alerts from SFO itself recommend allowing extra time for itineraries that involve an SFO connection.

Airport planning documents acknowledge that the current construction phase and air traffic management environment are temporary but significant. The same materials argue that the runway rehabilitation is intended to support long term safety and reliability, anticipating future growth and more modern traffic procedures once the project and federal reviews are complete.

In the near term, however, publicly available information from the airport and the FAA points to continued pressure on SFO’s schedule through at least early October, when Runway 1R is expected to return to service. Even then, the pace at which federal arrival restrictions are relaxed will likely determine how quickly San Francisco’s on time performance can recover.

SFO travel impact advisory: FAA reduced arrival rates and runway construction

SFO press release on six month closure of Runway 1R

San Francisco Airport Commission 2026 bond offering statement with delay forecasts

FAA real time status and recent traffic management advisories for SFO