Chicago O'Hare International (ORD) Delays and On-Time Departures
Chicago, IL · ranked 306th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, Chicago (ORD) had 359,911 scheduled departures and 73.4% of them left on time (US average 77.4%).
That ranks 306th of 333 US airports tracked on this site, with 2.8% of departures cancelled.
Republic Airways was the most punctual airline here, with 79.2% of departures on time.
September has been the best month (81% on time) and Sunday the weakest day of the week (72%).
Best time of day to fly out of Chicago (ORD)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 65.9% | 5.3% | 285 |
| 5am–6am | 90.7% | 2.0% | 6,323 |
| 6am–7am | 89.8% | 1.6% | 20,606 |
| 7am–8am | 89.4% | 1.1% | 46,130 |
| 8am–9am | 84.6% | 1.2% | 56,313 |
| 9am–10am | 82.2% | 1.0% | 47,009 |
| 10am–11am | 79.8% | 1.2% | 48,391 |
| 11am–12pm | 77.4% | 1.4% | 32,950 |
| 12pm–1pm | 78.0% | 1.5% | 32,552 |
| 1pm–2pm | 77.5% | 1.5% | 43,313 |
| 2pm–3pm | 75.2% | 1.6% | 45,032 |
| 3pm–4pm | 72.1% | 2.2% | 34,680 |
| 4pm–5pm | 70.3% | 2.6% | 37,473 |
| 5pm–6pm | 68.5% | 3.1% | 32,629 |
| 6pm–7pm | 69.5% | 2.3% | 51,000 |
| 7pm–8pm | 62.6% | 2.8% | 43,114 |
| 8pm–9pm | 63.6% | 3.2% | 43,164 |
| 9pm–10pm | 64.9% | 3.7% | 27,917 |
| 10pm–11pm | 61.8% | 6.3% | 11,160 |
| 11pm–12am | 66.8% | 10.7% | 1,013 |
Airlines at ORD ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| Republic Airways | 79.2% | 76.7% | 3.8% | 32,790 |
| Envoy Air | 78.0% | 77.2% | 2.9% | 57,363 |
| JetBlue | 77.5% | 76.9% | 5.2% | 1,192 |
| United Airlines | 76.0% | 73.8% | 1.4% | 100,681 |
| Delta Air Lines | 74.5% | 73.4% | 3.0% | 10,620 |
| Frontier Airlines | 71.9% | 68.1% | 3.7% | 4,176 |
| Alaska Airlines | 71.6% | 68.6% | 1.8% | 3,307 |
| SkyWest Airlines | 71.0% | 66.6% | 4.1% | 78,162 |
| Southwest Airlines | 68.7% | 71.5% | 1.3% | 3,547 |
| American Airlines | 65.9% | 67.1% | 2.6% | 60,898 |
| Spirit Airlines | 64.9% | 65.4% | 5.3% | 4,062 |
| PSA Airlines | 64.2% | 60.5% | 6.8% | 3,113 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of ORD
On-time departures by day, 24 months.
Best month to fly out of ORD
On-time departures by month, 24 months.
Holiday travel at Chicago (ORD)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 68.0% | -9.5 pts | 8.5% | 11,746 |
| Christmas & New Year (Dec 20 - Jan 3) | 70.2% | -7.2 pts | 1.3% | 24,184 |
| Summer peak (Jun 15 - Aug 15) | 68.9% | -8.6 pts | 2.4% | 123,325 |
| All other days | 77.5% | — | 1.8% | 501,799 |
Monthly on-time departure trend at ORD
On-time departure % each month, with the 12-month US average for reference.
Routes from Chicago (ORD)
Every route from ORD with its own page, by number of flights (last 12 months, on-time arrivals).