ORD · Chicago O'Hare International Airport
Chicago, IL. All airports.
Share of flights 15+ min late, by month
departures
arrivals
usual for the month (departures)
Jan 2015 → Jul 2026; gridlines 10/20/30/40%
Recent months — departures
| Month | Flights | Late 15+ | vs usual | Cancelled | Avg min | Main cause |
|---|---|---|---|---|---|---|
| Jul 2026 | 33,010 | 28.2% | -3.4 | 4.2% | 26 | Late aircraft |
| Jun 2026 | 31,374 | 26.9% | +1.2 | 3.2% | 23 | Late aircraft |
| May 2026 | 33,733 | 23.3% | +4.5 | 1.0% | 18 | Late aircraft |
| Apr 2026 | 33,206 | 26.5% | +8.1 | 3.5% | 22 | Late aircraft |
| Mar 2026 | 31,373 | 31.0% | +12.6 | 5.7% | 28 | Late aircraft |
| Feb 2026 | 25,538 | 22.4% | +3.6 | 1.1% | 17 | Airline |
| Jan 2026 | 25,131 | 29.5% | +7.4 | 3.7% | 25 | Late aircraft |
| Dec 2025 | 27,790 | 35.3% | +15.2 | 2.5% | 33 | Late aircraft |
| Nov 2025 | 28,703 | 24.5% | +9.4 | 5.6% | 21 | Late aircraft |
| Oct 2025 | 31,096 | 23.2% | +8.8 | 0.2% | 17 | Late aircraft |
| Sep 2025 | 28,867 | 21.4% | +5.4 | 0.4% | 16 | Late aircraft |
| Aug 2025 | 30,090 | 27.2% | +3.8 | 2.5% | 23 | Late aircraft |
| Jul 2025 | 30,503 | 35.5% | +7.7 | 2.6% | 31 | Late aircraft |
| Jun 2025 | 29,641 | 29.1% | +3.4 | 0.9% | 24 | Late aircraft |
| May 2025 | 27,990 | 19.6% | +0.8 | 0.6% | 15 | Late aircraft |
| Apr 2025 | 26,136 | 18.0% | -1.1 | 1.3% | 13 | Late aircraft |
| Mar 2025 | 24,580 | 22.0% | +3.7 | 1.0% | 17 | Late aircraft |
| Feb 2025 | 19,989 | 21.4% | +2.6 | 1.2% | 17 | Late aircraft |
| Jan 2025 | 21,643 | 19.7% | -2.6 | 1.8% | 15 | Late aircraft |
| Dec 2024 | 22,668 | 21.9% | +2.5 | 0.6% | 17 | Late aircraft |
| Nov 2024 | 22,435 | 14.9% | -0.3 | 0.3% | 11 | Airline |
| Oct 2024 | 25,211 | 14.1% | -2.2 | 0.4% | 9 | Airline |
| Sep 2024 | 24,847 | 16.0% | -1.3 | 0.3% | 11 | Late aircraft |
| Aug 2024 | 25,500 | 29.0% | +5.6 | 1.4% | 23 | Late aircraft |
Airlines here, Apr 2025 (departures)
| Airline | Flights | Late | Canc. |
|---|---|---|---|
| Republic | 2,636 | 12.1% | 1.6% |
| JetBlue | 85 | 12.9% | 0.0% |
| Southwest | 402 | 16.6% | 1.2% |
| Envoy | 3,829 | 16.6% | 1.7% |
| SkyWest | 4,793 | 17.5% | 1.5% |
| United | 8,011 | 18.2% | 0.7% |
| Alaska | 213 | 19.2% | 0.0% |
| Delta | 892 | 19.8% | 1.1% |
| American | 4,407 | 21.7% | 1.4% |
| Spirit | 578 | 23.5% | 0.7% |
| Frontier | 290 | 25.2% | 1.4% |
Airlines with 30+ departures that month.
Worst days on record
| Date | Flights | Late | Canc. |
|---|---|---|---|
| 2018-11-26 | 1003 | 92% | 55% |
| 2015-02-01 | 668 | 80% | 82% |
| 2015-03-23 | 883 | 89% | 23% |
| 2025-12-07 | 956 | 88% | 16% |
| 2019-11-11 | 974 | 79% | 53% |
| 2022-12-23 | 707 | 84% | 36% |
| 2019-07-18 | 1030 | 84% | 35% |
| 2015-11-21 | 669 | 80% | 47% |
| 2019-01-28 | 891 | 78% | 52% |
| 2015-04-09 | 896 | 82% | 40% |
| 2015-12-28 | 896 | 66% | 68% |
| 2025-11-30 | 1099 | 86% | 21% |
Departures; ranked by share late or cancelled.
FAA programs, last 90 days
| Started (UTC) | What | Hours |
|---|---|---|
| 2026-10-16 00:45 | Ground delay program | 3.3 |
| 2026-10-15 23:15 | Ground stop | 1.5 |
| 2026-10-15 21:45 | Departure delays | 4.5 |