Airports › Chicago (ORD) › September 2025
Airport month · September 2025
Chicago O'Hare International in September 2025
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In September 2025, reporting carriers scheduled 28,867 domestic departures from Chicago O'Hare International (ORD). 78.3% left less than 15 minutes late and 78.7% reached their destination on time; 0.4% were cancelled.
Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so ORD departures were 4.8 points below the national departure figure.
A year earlier, in September 2024, the airport had 24,847 departures with 83.7% leaving on time: a change of −5.4 points, with flights up 16%.
Flights arriving at ORD that month were on time 79.1% of the time (28,858 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 41%, air carrier 37% and national aviation system 17%.
- On time 78.7%
- Arrived 15+ minutes late 20.6%
- Cancelled 0.4%
- Diverted 0.2%
September 2025 against a year earlier, the airport's year and the nation
| Measure | Sep 2025 | Sep 2024 | ORD, 12 months to Jul 2026 | All reported flights, Sep 2025 |
|---|---|---|---|---|
| Departed on time | 78.3% | 83.7% | 71.4% | 83.1% |
| Arrived on time | 78.7% | 82.7% | 69.4% | 82.8% |
| Cancelled | 0.4% | 0.3% | 2.8% | 0.5% |
| Average departure delay (late minutes only) | 16.0 min | 10.9 min | 22.3 min | 12.2 min |
| Scheduled departures a day | 962 | 828 | 986 | 18,748 |
| Scheduled departures | 28,867 | 24,847 | 359,911 | 562,439 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 8,878 | 31% | 78.8% | 6.4 min | 0.2% |
| OO SkyWest Airlines | 6,195 | 21% | 76.6% | 7.1 min | 0.6% |
| AA American Airlines | 5,100 | 18% | 72.1% | 14.4 min | 0.5% |
| MQ Envoy Air | 4,048 | 14% | 84.9% | -1.7 min | 0.6% |
| YX Republic Airline | 1,846 | 6% | 86.8% | -3.5 min | 0.2% |
| DL Delta Air Lines | 1,012 | 4% | 81.1% | 3.9 min | 0.2% |
| NK Spirit Airlines | 471 | 2% | 87.3% | -4.6 min | 0.4% |
| WN Southwest Airlines | 395 | 1% | 82.5% | 1.3 min | 0.3% |
| F9 Frontier Airlines | 333 | 1% | 76.9% | 18.0 min | 1.2% |
| OH PSA Airlines | 249 | 1% | 69.5% | 20.0 min | 1.6% |
| AS Alaska Airlines | 243 | 1% | 79.8% | 2.8 min | 0.8% |
| B6 JetBlue Airways | 97 | 0% | 81.4% | 4.2 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ORD–LGA | Chicago to New York | 972 | 75.4% | 10.7 min | 0.3% |
| ORD–BOS | Chicago to Boston | 660 | 55.6% | 30.2 min | 0.6% |
| ORD–LAX | Chicago to Los Angeles | 616 | 81.0% | 5.8 min | 0.3% |
| ORD–DEN | Chicago to Denver | 605 | 80.0% | 5.8 min | 0.2% |
| ORD–DCA | Chicago to Washington | 576 | 67.0% | 19.4 min | 0.7% |
| ORD–ATL | Chicago to Atlanta | 543 | 87.1% | 0.4 min | 0.0% |
| ORD–MSP | Chicago to Minneapolis | 536 | 70.9% | 13.1 min | 0.4% |
| ORD–DFW | Chicago to Dallas/Fort Worth | 535 | 75.7% | 9.1 min | 1.5% |
| ORD–IAH | Chicago to Houston | 532 | 84.0% | -0.5 min | 0.2% |
| ORD–SEA | Chicago to Seattle | 509 | 83.7% | -2.9 min | 0.4% |
| ORD–SFO | Chicago to San Francisco | 490 | 77.6% | 6.3 min | 0.0% |
| ORD–DTW | Chicago to Detroit | 482 | 79.3% | 6.0 min | 0.2% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ORD on time in September 2025?
78.3% of 28,867 scheduled domestic departures left less than 15 minutes late, and 78.7% reached their destination on time. The national figures that month were 83.1% and 82.8%.
How does that compare with a year earlier?
In September 2024, 83.7% of 24,847 departures left on time and 0.3% were cancelled, against 78.3% and 0.4% in September 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for ORD · methodology · corrections.