Ground stop at San Francisco (SFO), Oct 25, 2026

EndedGround stop at SFO halts United departures for 47 minutes

Started: Sun, Oct 25, 7:35 PM PDT02:35 UTC
Ended: Sun, Oct 25, 8:22 PM PDT03:22 UTC
Duration: 47 min
Cause: other

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What happened

AI-written · may contain mistakes. Written from the advisory text and weather only.

Cause: The stated reason was "other," with no specific weather or equipment problem named. The weather report showed clear skies, 10-mile visibility and light winds.

The ground stop began at 02:35 UTC on October 26, 2026, holding United and its affiliates' departures from four air traffic control centers. It was scheduled to run until 04:00 UTC but ended at 03:22 UTC after 47 minutes, and was not extended. The advisory recorded 673 total delay minutes, with a maximum delay of 86 minutes.

Impact by airline

No airline data was collected for this ground stop.

Airline numbers appear after the first sample, within about 20 minutes of the start.

Impact by region

Air traffic control centers whose departures to the airport were held.

Center	Status
ZLA	Held
ZLC	Held
ZOA	Held
ZSE	Held

Timeline

Every change published while the ground stop was in effect, as seen each minute.

Oct 25, 7:35 PM PDT
Ground stop issued at SFO for other, until 9:00 pm PDT. Departures held from ZLA, ZLC, ZOA, ZSE.
Oct 25, 8:22 PM PDT
Ground stop ended after 47 min.

Advisories

The air traffic control advisories issued for this ground stop, as published.

ATCSCC ADVZY 006 SFO/ZOA 10/26/2026 CDM GROUND STOP

CTL ELEMENT: SFO
ELEMENT TYPE: APT
ADL TIME: 0230Z
GROUND STOP PERIOD: 26/0230Z - 26/0400Z
FLT INCL: CARRIER UAL ONLY
DEP FACILITIES INCLUDED: (1stTier) ZLA ZLC ZOA ZSE
PREVIOUS TOTAL, MAXIMUM, AVERAGE DELAYS: 0 / 0 / 0
NEW TOTAL, MAXIMUM, AVERAGE DELAYS: 673 / 86 / 42
PROBABILITY OF EXTENSION: MEDIUM
IMPACTING CONDITION: OTHER / OTHER
COMMENTS: UAL AND UAL SUBS ONLY

Original advisory ↗

How it is measured

Status, timeline, cause and held centers: the national airspace status feed, checked every minute, and the air traffic control advisories it links to.
Delays by airline and region: departures and arrivals at SFO 30 or more minutes late, by their estimated delay against the schedule, sampled every 10 minutes while the stop is active and once more after it ends.
Totals and cancellations: arrival and departure boards for SFO, every 30 minutes while active and once more after the end. Delayed means 15 or more minutes late at SFO; cancelled is the airline's cancelled status; codeshares count once. Flights scheduled from the start until an hour after the end are counted.
Held at origin: the same arrivals boards, which carry each flight's scheduled and actual departure from its origin. A flight is held when it is still scheduled, not departed, 15 or more minutes past its scheduled departure at a sample taken during the stop. In scope: its origin is in a held center or listed facility; flights from elsewhere are late for other reasons.
Inbound in the air: the same arrivals boards. At each board taken during the stop, a flight to SFO is in the air when it has departed (en route, or with an actual departure time) and not landed, cancelled or diverted; one still shown in the air over an hour past its arrival estimate, or departed more than 18 hours earlier, is treated as stale and left out.
Diversions: an inbound flight marked diverted during the stop or the wrap-up after it (not one marked before it could have departed), or one still shown in the air 30+ minutes past its arrival estimate that ADS-B (by its ICAO call sign) then found on the ground at another airport, not its origin. The diversion airport is the airport ADS-B found it at, else the updated destination. Cancellations never count. Regional flights flown under another call sign can't be found on ADS-B, so their diversion airport may be unknown.
Aircraft on the ground and holding: ADS-B positions around SFO, every 5 minutes; the airline is read from the call sign. Holding counts airline flights only (passenger, regional and cargo), not private, military or medical flights.
Weather: METARs, SIGMETs and weather alerts.
News: headline links filtered to this airport and these days; we show titles and links only.

Data sources are listed on the credits page.