- United Airlines experienced a systemwide technology outage on July 18, 2026, disrupting check-ins and kiosks.
- Ground operations were restored within fifty minutes, but residual delays affected nearly five thousand flights nationwide.
- Major hubs including Houston, Chicago, and Newark faced significant backlogs in baggage and passenger processing.
A system failure delayed flights across United Airlines on Saturday, July 18, after passengers lost access to check-in, boarding and ticket-processing functions at airports nationwide. Flights already airborne or away from the gate continued operating normally, but travelers still faced delays after the systems returned.
The disruption began before 7:40 a.m. Eastern Time. Down Detector recorded more than 430 reports involving the airline by 8:23 a.m., as passengers encountered unavailable kiosks and trouble completing airport procedures.
The outage hit contact centers and the carrier’s SHARES reservation system. Self-service kiosks at Houston’s George Bush Intercontinental Airport displayed “temporarily unavailable,” while travelers also reported problems at Newark Liberty International Airport and Washington Dulles International Airport.
The carrier rebooted its systems and restored operations by about 8:30 a.m. Eastern Time. A spokesperson said the disruption had affected contact centers and check-in processes.
“Our teams are getting our operations back to normal after a technology outage affected contact centers and check-in processes earlier today”
The airline urged passengers to check their flight status in its app before leaving for the airport. Rebooking support remained available through the carrier’s contact channels.
The technical problem lasted about 50 minutes, from roughly 7:40 a.m. to 8:30 a.m. Eastern Time. Its effects continued after the repair because crews and aircraft had to be placed back into their scheduled rotations.
The systems recovered, but the airport backlog did not
Passengers described long lines and continuing schedule changes at several hubs. Subh, posting from Houston’s Bush Airport, wrote: “Really @united? No one knows how to fix a computer glitch @ IAH Gate C34?”
Another traveler, Rory Not Sorry, reported that the baggage check-in system had failed at Chicago O’Hare International Airport. “United Baggage check-in system down at ORD (Chicago)… I'm cooked,” the traveler wrote.
The affected hubs included Houston, Newark, Chicago O’Hare, Washington Dulles, San Francisco and Los Angeles. The Houston Airport System said at 8:30 a.m. that the disruption at Bush Airport had been resolved.
The day’s wider disruption extended beyond the carrier. Across all major airlines, 4,896 flights were delayed and 126 were canceled on July 18, 2026. United and Southwest ranked among the most heavily affected carriers.
| System status | Passenger effect |
|---|---|
| Contact centers | Customers faced difficulty obtaining assistance and rebooking support |
| Check-in processes | Passengers could not consistently complete check-in or ticket processing |
| Self-service kiosks | Some airport machines displayed “temporarily unavailable” |
| Flights already airborne | Continued without being affected by the outage |
| Flights that had left the gate | Continued without being affected by the outage |
The distinction between the system failure and the later delays was visible in the operating pattern. The outage stopped or slowed airport processing, while the subsequent backlog required the carrier to adjust aircraft assignments and crew schedules.
Delays can outlast a short technical failure
A restored check-in platform does not immediately restore the day’s timetable. Aircraft can miss their next departure windows, and crews can reach duty limits or require reassignment. Those changes can create later delays even after passengers regain access to the airline’s systems.
The carrier warned that residual delays could continue through the weekend while it cleared the backlog. Travelers with connections faced an added risk because a delayed first flight could affect later segments that were not directly involved in the morning failure.
The airline’s official account said operations were returning to normal after an early morning technical issue affected contact centers and check-in processes. It also described the affected functions as including customer-support channels and airport check-in.
The incident followed a larger United disruption in August 2025, when more than 1,000 flights were delayed. It also recalled the July 2024 CrowdStrike outage, which grounded thousands of flights worldwide.
Those earlier incidents showed how quickly a problem in airline technology can spread beyond the original system. On Saturday, the initial failure centered on customer-facing processing, while the later disruption moved through airport queues, aircraft rotations and crew schedules.
What passengers should check before departure
The airline’s app provided the primary status channel during the recovery. Travelers could also contact the carrier about rebooking options, particularly when a delayed flight threatened a connection.
Passengers should verify their flight status again before heading to the airport rather than relying only on an earlier itinerary. They should also allow additional time at the terminal, especially where check-in or baggage lines had already formed.
Receipts for unexpected expenses should be retained while travelers work through rebooking or reimbursement questions. The disruption affected airport processing, so arriving earlier did not guarantee that a delayed schedule would immediately return to normal.
As of 6:38 p.m. UTC on July 18, systems were reported to be working normally, with no new outages detected during the previous 24 hours. Residual schedule changes remained possible as the carrier completed the weekend recovery.
