SFO flights face nearly 3-hour delays as winds trigger FAA hold

Flights into San Francisco International Airport faced average delays approaching three hours on Thursday after shifting winds and low clouds triggered a Federal Aviation Administration ground delay program that sharply reduced the number of arrivals the airport could accept.

Ground delay program slashes arrival capacity

According to published FAA traffic management data, a ground delay program was put in place for San Francisco International Airport on May 28, holding many inbound flights at their departure airports while arrival slots were metered into the Bay Area hub. The program, which extended into the late evening, was designed to manage demand after winds disrupted SFO’s usual runway configuration and lowered its arrival rate.

Reports from national airspace status tools indicate that average delays for flights bound for SFO climbed well past two hours at the peak of the disruption, with some services facing holds of nearly three hours before being cleared to depart toward San Francisco. An FAA advisory cited wind and low cloud conditions as the primary operational constraints on the airfield.

Local coverage notes that the delay program limited arrivals to roughly the mid-30s per hour at times, compared with the 50-plus arrivals that can be possible in more favorable conditions. The reduced throughput created a backlog of flights waiting for landing slots, especially for services scheduled to reach SFO during the busy late afternoon and evening periods.

By Thursday night, the program’s end time had been adjusted several times as forecasters and air traffic managers assessed how quickly the wind pattern would normalize and whether visibility would improve enough to restore a more efficient runway use configuration.

Unusual wind pattern disrupts normal runway use

Publicly available airport operations primers for SFO explain that the airport normally relies on its two closely spaced west-facing runways for simultaneous approaches during typical onshore wind conditions, which allows for a higher arrival rate. When winds shift and begin blowing from the east, that pattern often has to change, forcing controllers to favor different runway combinations that inherently handle fewer arrivals per hour.

On Thursday, meteorological reports pointed to easterly and shifting winds that were strong enough to require a less efficient landing pattern. Under that arrangement, aircraft spacing must increase, and some runways that normally carry simultaneous operations can be used only in a more conservative, staggered fashion. The result is a lower arrival acceptance rate even when overall demand for SFO flights remains high.

Past FAA documentation on SFO indicates that in adverse weather or atypical wind situations, the airport’s arrival capacity can fall from as many as 60 flights per hour in ideal conditions to the 30s. When schedules are built around higher capacity, any extended period at a lower rate can quickly lead to cascading delays affecting multiple airlines and routes.

Thursday’s pattern fit that profile, with the combination of low clouds and wind leaving controllers little room to accelerate the flow without compromising required separation between aircraft. Airlines, in turn, were required to adhere to assigned departure times from origin airports in order to prevent excessive airborne holding near San Francisco.

Hundreds of passengers caught in rolling disruptions

Flight status boards and airline operations dashboards showed hundreds of delayed arrivals and departures at SFO as the ground delay program took hold, with ripple effects reaching airports across the western United States and beyond. Flights from major West Coast gateways were among the most heavily affected, as carriers attempted to sequence short-haul services into a crowded arrival queue.

Travelers connecting through San Francisco faced particular challenges, since prolonged inbound delays compressed or eliminated layover windows. According to published coverage from Bay Area outlets, some passengers were rebooked through alternate hubs such as Los Angeles and Seattle as airlines sought to keep long-haul connections viable while SFO’s arrival capacity remained constrained.

Operational data suggest that as the day progressed, delays shifted from predominantly inbound holds at origin airports to a mix of late arrivals and late departures from SFO itself. Aircraft and crews arriving behind schedule had to be reassigned or turned around quickly, complicating airline efforts to bring evening schedules back on time.

While relatively few outright cancellations were reported in the early hours of the disruption, industry tracking services indicated that prolonged delays approaching or exceeding three hours raised the risk of crews reaching duty-time limits and of aircraft missing later rotations. Such factors can cause additional cancellations or last-minute schedule swaps even after weather conditions begin to improve.

Part of a broader pattern of weather-related SFO delays

The latest wind-driven slowdown fits into a broader pattern of weather-related congestion at San Francisco International Airport. FAA performance reviews and airport planning documents highlight SFO as one of the U.S. facilities most sensitive to changes in wind, cloud ceiling, and visibility, due in part to its closely spaced parallel runways and high traffic volumes.

Ground delay programs are a standard tool used by air traffic managers to manage those constraints. FAA guidance describes ground delay programs as a way to hold flights at their departure points until specific arrival slots are available, which helps keep airborne traffic at safe levels around affected airports and reduces the need for extended holding patterns in the sky.

In recent months, SFO has seen multiple ground delay programs linked to wind and low clouds, including events in February and April that cut arrival rates and produced multi-hour delays for some flights. Industry analysis suggests that recurring construction and evolving safety rules around parallel landings have added further complexity to how SFO can operate in marginal conditions.

Travel experts note that on days when such programs are in place, even travelers departing from airports far from the Bay Area can experience substantial waits, as their flights are timed to arrive only when SFO can accommodate them. The result is that what appears to be a local weather challenge can feel like a nationwide slowdown for anyone traveling through the San Francisco hub.

What travelers can do on high-delay days

While Thursday’s disruptions were driven by factors beyond airline or passenger control, publicly available aviation guidance suggests several strategies for navigating days when SFO is under a ground delay program. Checking the FAA’s national airspace status tools and airline alerts before leaving for the airport can provide early notice of significant metering or slot restrictions.

Travel planners frequently recommend building longer connection times when routing through San Francisco during seasons prone to low clouds or gusty winds, particularly in the late afternoon and evening peaks. Choosing earlier departures on the same day can sometimes reduce exposure to knock-on delays if conditions worsen as traffic builds.

Aviation operations data also show that flights with longer stage lengths or international connections may receive priority when arrival capacity is constrained, which can influence how airlines rebook affected passengers. Travelers whose itineraries involve tight onward connections may benefit from proactively requesting alternative routings through other hubs when extensive holds into SFO are reported.

As Thursday’s events demonstrated, an FAA ground delay program driven by wind can turn an otherwise routine travel day into a prolonged wait both at and en route to the airport. For one of the country’s busiest West Coast gateways, accommodating those shifts in weather will remain a central challenge as airlines and passengers adjust to more frequent operational constraints.