Airports › Chicago (ORD) › May 2025
Airport month · May 2025
Chicago O'Hare International in May 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 May 2025, reporting carriers scheduled 27,990 domestic departures from Chicago O'Hare International (ORD). 79.9% left less than 15 minutes late and 78.0% reached their destination on time; 0.6% were cancelled.
Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so ORD departures were 3.2 points above the national departure figure.
A year earlier, in May 2024, the airport had 24,845 departures with 68.2% leaving on time: a change of +11.7 points, with flights up 13%.
Flights arriving at ORD that month were on time 78.5% of the time (27,996 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 34%, air carrier 30% and national aviation system 28%.
- On time 78.0%
- Arrived 15+ minutes late 21.0%
- Cancelled 0.6%
- Diverted 0.3%
May 2025 against a year earlier, the airport's year and the nation
| Measure | May 2025 | May 2024 | ORD, 12 months to Jul 2026 | All reported flights, May 2025 |
|---|---|---|---|---|
| Departed on time | 79.9% | 68.2% | 71.4% | 76.7% |
| Arrived on time | 78.0% | 64.6% | 69.4% | 75.4% |
| Cancelled | 0.6% | 1.7% | 2.8% | 1.0% |
| Average departure delay (late minutes only) | 14.8 min | 29.7 min | 22.3 min | 17.5 min |
| Scheduled departures a day | 933 | 828 | 986 | 20,188 |
| Scheduled departures | 27,990 | 24,845 | 359,911 | 605,648 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 8,263 | 30% | 78.4% | 4.8 min | 0.3% |
| OO SkyWest Airlines | 5,508 | 20% | 79.5% | 5.9 min | 0.4% |
| AA American Airlines | 4,954 | 18% | 74.9% | 7.9 min | 0.8% |
| MQ Envoy Air | 4,451 | 16% | 79.1% | 4.1 min | 1.4% |
| YX Republic Airline | 2,108 | 8% | 83.6% | 0.0 min | 0.6% |
| DL Delta Air Lines | 1,105 | 4% | 74.0% | 16.0 min | 0.8% |
| NK Spirit Airlines | 537 | 2% | 76.7% | 6.5 min | 0.6% |
| WN Southwest Airlines | 419 | 1% | 69.5% | 16.1 min | 0.7% |
| AS Alaska Airlines | 281 | 1% | 79.7% | 0.8 min | 0.7% |
| F9 Frontier Airlines | 245 | 1% | 65.7% | 36.6 min | 0.0% |
| B6 JetBlue Airways | 119 | 0% | 70.6% | 24.6 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ORD–LGA | Chicago to New York | 981 | 70.5% | 19.6 min | 1.5% |
| ORD–BOS | Chicago to Boston | 645 | 65.9% | 17.5 min | 0.6% |
| ORD–LAX | Chicago to Los Angeles | 640 | 86.4% | -10.3 min | 0.3% |
| ORD–MSP | Chicago to Minneapolis | 566 | 71.0% | 15.5 min | 0.7% |
| ORD–ATL | Chicago to Atlanta | 557 | 77.4% | 6.8 min | 0.2% |
| ORD–DCA | Chicago to Washington | 555 | 69.7% | 15.0 min | 0.5% |
| ORD–DEN | Chicago to Denver | 553 | 75.8% | 7.8 min | 0.0% |
| ORD–DFW | Chicago to Dallas/Fort Worth | 548 | 70.4% | 15.5 min | 1.3% |
| ORD–SEA | Chicago to Seattle | 537 | 82.9% | -1.8 min | 0.4% |
| ORD–DTW | Chicago to Detroit | 531 | 82.1% | 6.3 min | 0.8% |
| ORD–PHX | Chicago to Phoenix | 512 | 84.8% | -4.3 min | 0.0% |
| ORD–EWR | Chicago to Newark | 509 | 44.4% | 50.8 min | 5.7% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ORD on time in May 2025?
79.9% of 27,990 scheduled domestic departures left less than 15 minutes late, and 78.0% reached their destination on time. The national figures that month were 76.7% and 75.4%.
How does that compare with a year earlier?
In May 2024, 68.2% of 24,845 departures left on time and 1.7% were cancelled, against 79.9% and 0.6% in May 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 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.