What happened
AI-written · may contain mistakes. Written from the advisory text and weather only.
Cause: Thunderstorms in the area, with a thunderstorm advisory active over the airport, led air traffic control to pause departures there.
The ground stop at Chicago O'Hare began at 00:05 UTC on October 16 and was set to run until 9:00 pm Central time. It ended at 00:40 UTC, after 35 minutes, and was not extended.
Impact by airline
Flights to and from ORD scheduled during the ground stop and the hour after it. Delayed means 15+ minutes late.
- Flights
- 242
- Delayed
- 110
- Cancelled
- 0
- Arrivals / departures
- 132 / 110
| Airline | Flights | Delayed / cancelled | Avg delay | On ground | Holding |
|---|---|---|---|---|---|
| United Airlines UA | 76 | 26 / 0 | 37 min | 41 | — |
| American Airlines AA | 45 | 23 / 0 | 58 min | 21 | — |
| SkyWest Airlines OO | 35 | 20 / 0 | 55 min | 18 | — |
| Envoy Air MQ | 33 | 12 / 0 | 45 min | 6 | — |
| Delta Air Lines DL | 11 | 9 / 0 | 73 min | 4 | — |
| Republic Airways YX | 13 | 6 / 0 | 45 min | 3 | — |
| GoJet Airlines G7 | 8 | 4 / 0 | 81 min | 3 | — |
| Air Canada AC | 3 | 2 / 0 | 68 min | — | — |
| JetBlue B6 | 2 | 2 / 0 | 38 min | — | — |
| Alaska Airlines AS | 2 | 1 / 0 | 34 min | 2 | — |
| Icelandair FI | 1 | 1 / 0 | 65 min | 1 | — |
| LOT Polish Airlines LO | 1 | 1 / 0 | 28 min | 1 | — |
| Lufthansa LH | 1 | 1 / 0 | 50 min | — | — |
| Turkish Airlines TK | 1 | 1 / 0 | 50 min | — | — |
| Avelo Airlines XP | 1 | 1 / 0 | 46 min | — | — |
Delayed 15+ min CancelledOn ground / holding: most seen at once.
Held at origin
Flights to ORD still on the ground at their origin 15+ minutes past their scheduled departure while the stop was in effect. Held time is minutes past the scheduled departure.
- Held at origin
- 25
- Average held
- 1 hr 15 min
- Longest
- 3 hr 33 min
7 from airports in the stop's scope; 18 from outside it, late for other reasons. Of the held flights, 11 since departed.
By origin
| Origin | Scope | Held | Avg | Longest |
|---|---|---|---|---|
| DTW Detroit | In scope | 2 | 2 hr 4 min | 3 hr 33 min |
| MSP Minneapolis | In scope | 2 | 1 hr 14 min | 1 hr 15 min |
| CMH Columbus | In scope | 1 | 41 min | 41 min |
| OMA Omaha | In scope | 1 | 40 min | 40 min |
| PIT Pittsburgh | In scope | 1 | 45 min | 45 min |
| ATL Atlanta | Outside | 2 | 1 hr 2 min | 1 hr 20 min |
| CID | Outside | 2 | 54 min | 1 hr 2 min |
| BWI Baltimore | Outside | 1 | 1 hr 21 min | 1 hr 21 min |
| DCA Arlington | Outside | 1 | 1 hr 37 min | 1 hr 37 min |
| DFW DFW Airport | Outside | 1 | 15 min | 15 min |
| FAR | Outside | 1 | 55 min | 55 min |
| ICT Wichita | Outside | 1 | 50 min | 50 min |
| JAX Jacksonville | Outside | 1 | 3 hr 12 min | 3 hr 12 min |
| LSE | Outside | 1 | 36 min | 36 min |
| MCI Kansas City | Outside | 1 | 2 hr 55 min | 2 hr 55 min |
By airline
| Airline | Held | Avg | Longest |
|---|---|---|---|
| SkyWest Airlines OO | 8 | 58 min | 2 hr 18 min |
| United Airlines UA | 5 | 2 hr 1 min | 3 hr 33 min |
| American Airlines AA | 3 | 52 min | 1 hr 37 min |
| Envoy Air MQ | 3 | 1 hr 31 min | 2 hr 55 min |
| Delta Air Lines DL | 2 | 55 min | 1 hr 15 min |
| GoJet Airlines G7 | 2 | 58 min | 1 hr 6 min |
| Air Canada AC | 1 | 1 hr 27 min | 1 hr 27 min |
| Republic Airways YX | 1 | 1 hr 12 min | 1 hr 12 min |
Inbound in the air and diversions
Flights to ORD that had departed and not yet landed, at each arrivals board sample while the stop was in effect, and inbound flights that landed somewhere else instead.
- Peak in the air
- 105
- Diverted
- 0
In the air at the peak (Oct 15, 7:36 PM CDT), by airline
- United Airlines UA32
- American Airlines AA19
- SkyWest Airlines OO19
- Envoy Air MQ14
- Republic Airways YX6
- GoJet Airlines G75
- Delta Air Lines DL3
- Air Canada AC1
Diversions
No inbound flight has been seen diverting during this stop.
Impact by region
Arrivals by the air traffic control center they departed from. Held: departures from that center were stopped.
| Center | Status | Arrivals | Delayed | Cancelled |
|---|---|---|---|---|
| Cleveland Center (ZOB) | Held | 4 | 3 | 0 |
| Minneapolis Center (ZMP) | Held | 3 | 3 | 0 |
| Indianapolis Center (ZID) | Held | 3 | 2 | 0 |
| Outside the US centers | Not held | 35 | 17 | 0 |
| Kansas City Center (ZKC) | Not held | 8 | 6 | 0 |
| Washington Center (ZDC) | Not held | 7 | 4 | 0 |
| Boston Center (ZBW) | Not held | 9 | 3 | 0 |
| Los Angeles Center (ZLA) | Not held | 8 | 3 | 0 |
| Atlanta Center (ZTL) | Not held | 7 | 3 | 0 |
| Memphis Center (ZME) | Not held | 4 | 2 | 0 |
| Miami Center (ZMA) | Not held | 5 | 1 | 0 |
| New York Center (ZNY) | Not held | 5 | 1 | 0 |
| Oakland Center (ZOA) | Not held | 5 | 1 | 0 |
| Fort Worth Center (ZFW) | Not held | 4 | 1 | 0 |
| Jacksonville Center (ZJX) | Not held | 3 | 1 | 0 |
| Salt Lake City Center (ZLC) | Not held | 3 | 1 | 0 |
| Chicago Center (ZAU) | Not held | 2 | 1 | 0 |
| Denver Center (ZDV) | Not held | 2 | 1 | 0 |
| Houston Center (ZHU) | Not held | 6 | 0 | 0 |
| Seattle Center (ZSE) | Not held | 4 | 0 | 0 |
| Anchorage Center (ZAN) | Not held | 2 | 0 | 0 |
| San Juan Center (ZSU) | Not held | 2 | 0 | 0 |
| Albuquerque Center (ZAB) | Not held | 1 | 0 | 0 |
Aircraft at the airport
Peak 117 on the ground, 0 holding nearby.
On the ground Holding nearby
Timeline
Every change published while the ground stop was in effect, as seen each minute.
Ground stop issued at ORD for thunderstorms, until 9:00 pm CDT. Departures held from ZOB, ZID, ZMP.
Ground stop ended after 35 min.
Advisories
The air traffic control advisories issued for this ground stop, as published.
ATCSCC ADVZY 002 ORD/ZAU 10/16/2026 CDM GROUND STOP
CTL ELEMENT: ORD ELEMENT TYPE: APT ADL TIME: 0001Z GROUND STOP PERIOD: 16/0000Z - 16/0200Z DEP FACILITIES INCLUDED: (Manual) ZOB ZID ZMP PREVIOUS TOTAL, MAXIMUM, AVERAGE DELAYS: 428 / 53 / 11 NEW TOTAL, MAXIMUM, AVERAGE DELAYS: 3963 / 222 / 99 PROBABILITY OF EXTENSION: MEDIUM IMPACTING CONDITION: WEATHER / THUNDERSTORMS COMMENTS:Original advisory ↗