United’s FAA Ground-Stop Chaos Prompts Flexible Rebooking

After the FAA issued a ground stop for flights departing from Houston’s Bush Intercontinental Airport, United Airlines saw delays surge and cancellations spike—then ran into more disruption at Chicago O’Hare on Sunday. United reached out to affected passengers

When the FAA put flights on hold at Houston’s Bush Intercontinental Airport on Saturday, United Airlines didn’t just fall behind—it started moving in a way travelers would recognize as “day-killing.” Delays grew, departures piled up, and cancellations followed.

The ground stop was issued by the Federal Aviation Administration for flights departing from Houston’s George Bush Intercontinental Airport. The FAA lifted the ground stop on May 23, and it remained in effect until 5:45 P.M. The disruption was driven by heavy rain and the risk of flooding in the Houston area. Weather like that doesn’t negotiate with timetables; it overwhelms them.

For the day, Bush Airport recorded a surge in delays. It had the most delayed departures worldwide. FlightAware data shows IAH delayed more than 61% of its departing flights on Saturday—388 total departures. Arriving flights weren’t spared either, with 318 flights affected.

United Airlines was the carrier hit hardest by the sheer volume moving through IAH. On May 23, the airline had the second-most delays worldwide with 834 delays, trailing only American Airlines. Cancellations also rose above typical levels for United, reaching 27—the highest total among U.S. airlines.

Over the same Saturday period, there were 6,348 delays within, into, or out of the United States.

With so many flights disrupted at a single hub. United Airlines reached out to passengers with flexible rebooking options tied to the Houston thunderstorms disruption. The airline updated its travel alerts page with a dedicated section titled “Houston Thunderstorms. ” describing information that had been made available to affected passengers out of Houston on Saturday.

United Airlines wrote: “If your flight is affected. here are your options: You can reschedule your trip and we’ll waive change fees and fare differences. But, your new flight must be a United flight departing between May 21, 2026 and May 26, 2026. Tickets must be in the same cabin and between the same cities as originally booked.”.

The airline added one eligibility condition: the original ticket had to be purchased on or before May 21, 2026.

Disruptions eased for United at IAH on Sunday—but that relief didn’t last for the airline’s broader network. The number of problems shifted to other major hubs, once again pushing United’s disruption totals upward.

On Sunday. United Airlines faced more delays across the United States. with 6. 695 delays within. into. or out of the United States. Chicago O’Hare International Airport became a major driver of that increase. The hub at 768 departure delays accounted for more than half of its entire volume. O’Hare also recorded the most delays on arriving flights, with 680—both totals by far the highest worldwide.

Even with the weather no longer centered on Houston, United was again among the carriers most affected by congestion at a high-volume airport. On Sunday, United had 834 delays. Only Southwest Airlines and American Airlines had more delayed flights, trailing United by just a couple of flights.

Cancellations were a different story. United’s cancellations on Sunday were lower than American Airlines’. United canceled 16 flights, while American Airlines canceled 233 due to a cancellation meltdown at DFW.

For travelers, the strain wasn’t just numbers on a screen—it was how it felt when connections fell apart and timing stopped cooperating. Reddit users described what layovers at O’Hare have been like for them, especially when congestion keeps spilling into gates and schedules.

One passenger wrote: “ORD is the worst layover airport for connecting flights. Every time my connection is delayed or cancelled due to airport traffic, congestion.”

Another commenter zeroed in on the airport’s gate layout. They wrote: “The gates at ORD make no sense. The G gates are next to the K gates. Where are the H, I, and J gates?. They don’t exist. Actually wait; as you walk down the middle of the concourse. all the gates to your left are H and to your right are K. Until you come to a fork. Then there are 2 H gates

and 6 K gates on the left side of the fork and 10 K gates on the right side of the fork. ” adding. “Can you get from K to D to find the one food place (a Subway) that is still open at the unholy hour of 8PM?. Maybe. The American Airlines app thinks that you have to go out to baggage claim and then go back through security (you don’t). Your flight is

at G20. Cool. The horror of it all.”.

The FAA and major airlines, including United, have agreed to reduce flight volume this summer to ensure on-time departures. For now. though. United passengers are still dealing with delays and cancellations on high-volume travel days as congestion continues to ripple through major hubs like IAH and ORD.

United Airlines FAA ground stop Houston Bush Intercontinental George Bush Intercontinental Airport Chicago O'Hare IAH delays ORD delays airline cancellations flexible rebooking travel alerts Houston thunderstorms