San Francisco International Airport (SFO) is experiencing escalating flight delays on September 5, 2026, linked to the continued closure of Runway 1 Right since March 30, 2026. The runway remains closed for a six-month pavement and taxiway improvement project valued at $180 million, funded in part by more than $92 million in Federal Aviation Administration (FAA) grants. The project is scheduled for completion with runway reopening in early October 2026.
During the closure, all arrivals and departures are managed primarily through Runways 28 Left and 28 Right. Additionally, Runway 01R/19L and adjacent taxiways are out of service through at least
October 2, 2026. The FAA has imposed flight restrictions on certain closely spaced parallel approaches, lowering peak arrival rates from approximately 54 aircraft per hour to around 36 per hour, further constraining airport throughput.
Construction and FAA Flight Caps Drive Delays
Operational constraints from the runway closures combined with FAA-imposed arrival caps have forced tighter sequencing of landings and takeoffs. The FAA Air Traffic Control System Command Center has issued repeated ground delay programs and arrival delay advisories encompassing the summer of 2026. The Southwest airport is particularly vulnerable to extended delays during periods of low cloud ceiling and coastal fog, which occur frequently, compounding bottlenecks.
The
reduction to a dual-runway operation imposes less flexibility for handling surges in traffic or weather disruptions, leading to increases in gate holds, airborne holding patterns, and rolling delays that ripple through connecting flights across the airline network. Delays are most prominent during midmorning and late evening peak periods.
Impact on On-Time Performance and Traveler Experience
Transportation Department statistics for early 2026 indicate SFO had among the lowest on-time performance rates among major U.S. airports after the runway closure and FAA flight caps took effect. Data show fewer than 55 percent of flights arrived within 15 minutes of schedule in some months. Travelers report significant disruptions during peak
periods, aligning with forecasts warning of heightened congestion during these hours.
The airport advises passengers to monitor flight status carefully and allocate extra time when traveling to or from San Francisco during this period. Frequent delays exceed 30 minutes and extend beyond the Bay Area due to ground holds at origin airports issued to comply with FAA arrival slot limitations.
Runway Reopening Expected in Early October; FAA Limits to Continue
Runway 1 Right is projected to return to service in early October 2026, which should restore some operational capacity by enabling distribution of traffic across additional runways. However, FAA restrictions imposing reduced arrival rates on certain parallel approaches will remain
active beyond runway reopening while safety reviews persist.
The ongoing combination of constrained infrastructure and federal arrival limits is expected to maintain elevated delay risks, especially in adverse weather or during peak travel times. Airlines will likely continue adjusting schedules and padding connections to accommodate the reduced airport throughput.
