FAA ground stops tied to thunderstorms and airspace volume congestion hammered Chicago O’Hare on August 30, producing 1,611 total delays — more than any other airport worldwide that day — and leaving United Airlines holding the worst cancellation numbers among U.S. carriers.
United recorded 996 delays systemwide on Sunday, second most globally, and 23 cancellations, the highest count among domestic airlines. At O’Hare specifically, the carrier delayed 424 flights — 46 percent of its total hub volume — and cancelled eight, also the most of any airline at that airport.
The FAA issued the first ground stop in the morning due to thunderstorms. A separate pause followed later in the day for airspace volume on the runway. Both departure and arrival delays exceeded 50 percent of ORD’s flight volume. Across all U.S. carriers, FlightAware tracked 6,945 delays and 117 cancellations for flights within, into, or out of the United States on August 30.
Denver International was a distant second for departure delays with 381, followed by San Francisco at 195, Hartsfield-Jackson at 158, and Los Angeles at 150. SkyWest, American, Republic, and Delta all absorbed significant delays at ORD as well.
For crew operating through O’Hare, the compounding ground stops created extended on-aircraft holds. One passenger reported sitting on the runway at ORD for nearly three hours following a connection delay. Others reported being deboarded and encountering rebooking difficulties.
Southwest Airlines finished Sunday with more total delays than United — 1,001 — but fewer cancellations.
Heading into the new week, United carried six cancellations and 37 delays as of Monday, tied with JetBlue for the most U.S. cancellations. O’Hare showed 100 cancellations and 50 delays. Severe storms are forecast to move into Northeast hubs by midweek, with United, Delta, American, and JetBlue all projected to face continued disruption.
