SFO warns of months of arrival delays amid runway work

Air travelers flying into San Francisco International Airport over the next six months are being advised to brace for longer-than-usual waits, as a major runway repaving project and new federal safety limits are expected to push arrival delays to about one in four flights.

Runway 1R closure concentrates traffic on main arrival pair

According to publicly available airport planning documents, San Francisco International Airport has taken Runway 1 Right out of service from March 30 to October 2, 2026, to resurface the pavement and upgrade adjacent taxiways and lighting. The work, budgeted at around 180 to 200 million dollars, is described in prior airport communications as a fast-paced infrastructure program intended to extend the runway’s life and improve safety once it reopens.

During the closure, all regular commercial arrivals and departures are being funneled onto the airport’s primary east-west runways, 28 Left and 28 Right. Those runways already handle the majority of SFO’s traffic under normal conditions, but the loss of one of the north-south runways removes flexibility during busy periods and in certain wind patterns.

Airport materials previously projected that fewer than 10 to 15 percent of flights might face delays of around 30 minutes tied directly to the construction. More recent coverage indicates that forecast has shifted upward after federal regulators layered additional limits on how the remaining runways can be used.

The repaving is the latest in a series of large-scale airfield improvements at SFO that have periodically constrained capacity. Earlier runway rehabilitation projects in prior years also triggered temporary cutbacks in arrival rates, leading to cascading delays during peak travel windows.

FAA safety changes sharply cut SFO’s arrival capacity

New information reported this week shows that the Federal Aviation Administration has reduced the maximum number of arrivals permitted at SFO while the runway work is underway. The change follows a broader reassessment of how closely spaced parallel approaches are managed at the airport.

Publicly available FAA and local news summaries indicate that SFO’s typical arrival rate in clear weather has been about 54 aircraft per hour, using side-by-side approaches to runways 28 Left and 28 Right. With Runway 1 Right closed and updated safety rules in place, that hourly arrival rate is being cut to roughly 36, a one-third reduction that significantly tightens the number of landing slots available in busy banks.

Coverage by national and Bay Area outlets describes the adjustment as part of a package of safety measures at SFO, where the runways and the region’s crowded airspace create a complex operating environment. The new limits arrive on top of the construction-related constraints, magnifying the effect on airlines’ ability to land aircraft during peak periods.

As a result, air traffic managers are expected to rely more often on so-called ground delay programs, which meter departures from other airports bound for SFO to avoid excessive airborne holding. These programs can translate into sizable departure delays hundreds or thousands of miles from the Bay Area, even when local weather is clear.

Delay projections climb to about 25% of arriving flights

In televised coverage and subsequent reports, airport representatives have indicated that the combined impact of the runway closure and the FAA’s revised arrival limits could now affect up to 25 percent of arriving flights at SFO. Those flights are expected to experience delays of at least 30 minutes, particularly during the morning and evening peaks when banks of inbound aircraft typically converge on the airport.

Earlier airport estimates for the construction period had focused on roughly 10 to 15 percent of flights being delayed due to the repaving alone. The higher figure now being circulated reflects how the new federal operating rules and the single-pair runway configuration interact, reducing the margin to absorb surges in arriving traffic.

Reports indicate that the delay risk will not be uniform across the day. Periods around 9 a.m. and the late evening arrival waves are singled out as especially vulnerable, since they concentrate long-haul and transcontinental flights that have limited schedule flexibility. Weather disruptions, such as low clouds or strong crosswinds, could further degrade arrival rates and push more flights into holding or preemptive ground delays.

Airlines are expected to adjust schedules and aircraft routings as the six-month work progresses, but many itineraries are already heavily sold heading into the busy summer season. Even modest arrival constraints in that context can ripple through the network, affecting connections and turnaround times.

What passengers flying through SFO should expect

For travelers, the practical effect of the new operating environment at SFO is a higher probability of late arrivals, even on days without storms. Industry analysis suggests that when an airport’s arrival rate is cut as sharply as SFO’s, on-time performance tends to deteriorate most during the busiest hours, while off-peak flights may see relatively minor changes.

Published guidance from the airport and airlines encourages passengers to build extra time into their plans if they are connecting through SFO between late March and early October. Longer layovers, especially for international-to-domestic connections, can provide a buffer against missed flights if inbound aircraft are held on the ground at their departure cities or placed into holding patterns over the Bay Area.

Travelers starting or ending their trips at SFO are being urged by consumer advocates and travel planners to monitor flight status closely on the day of travel. Same-day schedule changes, gate swaps and rolling delays may be more common as carriers react to evolving arrival slot allocations and weather conditions.

Some airlines serving SFO are expected to fine-tune their schedules and aircraft assignments over the coming weeks, potentially trimming frequencies during the most constrained time windows while preserving key trunk routes. Those adjustments could lessen the sting of the new limits for some travelers, but they may also mean fewer alternative flights when disruptions do occur.

Longer-term benefits promised once upgrades are complete

While the immediate outlook for on-time arrivals at SFO is challenging, airport planning documents and prior public presentations frame the six-month project as an investment in smoother operations and added safety down the line. The Runway 1 Right work includes new pavement, upgraded lighting and taxiway realignments designed to streamline ground movements once the runway returns to service.

Improvements such as modern LED centerline lights and reconfigured taxiways are intended to support more efficient traffic flows in the years ahead. Combined with any future refinements to FAA procedures, those upgrades could help SFO recover some of the arrival capacity it is temporarily giving up, particularly during low-visibility operations.

Local reporting notes that SFO has undergone similar runway rehabilitation efforts in the past, and that while short-term disruption was often significant, long-term reliability and safety benefited. The airport faces the added challenge today of heavier passenger volumes and a more congested national airspace system, which means the margin for error during construction is thinner.

For now, travelers planning trips into the Bay Area through late September and early October are likely to face a trade-off: short-term inconvenience in the form of longer waits on arrival, in exchange for airfield upgrades that aim to make one of the country’s busiest gateways more resilient in the future.