Best Time to Fly PIT to ORD: On-Time Stats by Hour & Airline
Pittsburgh International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 78.8% of Pittsburgh (PIT) to Chicago (ORD) flights arrived on time (4,003 scheduled flights). That is 1.2 points above the national average of 77.6%.
Among 5 airlines, Republic Airways led with 84.5% on time and SkyWest Airlines was last with 68.7%.
Over 24 months, Tuesday was the most reliable day (83% on time) and July the worst month (75%).
The cancellation rate was 2.2% (US average 1.8%).
PIT to ORD on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airways | 84.5% | 72 min | 1.7% | 1,676 |
| United Airlines | 78.2% | 98 min | 2.1% | 1,293 |
| Envoy Air | 77.8% | 105 min | 2.7% | 186 |
| American Airlines | 68.7% | 119 min | 3.1% | 606 |
| SkyWest Airlines | 68.7% | 110 min | 3.7% | 242 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PIT to ORD
On-time arrival % by scheduled departure hour (local time), 7,291 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 97.3% | 2.6% | 113 |
| 6am–7am | 90.5% | 1.6% | 497 |
| 7am–8am | 89.7% | 0.7% | 884 |
| 8am–9am | 88.0% | 0.8% | 955 |
| 9am–10am | 87.1% | 0.9% | 336 |
| 10am–11am | 89.8% | 0.9% | 524 |
| 11am–12pm | 87.6% | 0.9% | 682 |
| 12pm–1pm | 81.4% | 2.5% | 160 |
| 1pm–2pm | 75.8% | 0.0% | 99 |
| 2pm–3pm | 79.7% | 1.8% | 723 |
| 3pm–4pm | 73.9% | 0.8% | 234 |
| 4pm–5pm | 77.1% | 2.1% | 620 |
| 5pm–6pm | 59.1% | 1.5% | 649 |
| 6pm–7pm | 65.7% | 2.5% | 326 |
| 7pm–8pm | 65.7% | 4.2% | 259 |
| 8pm–9pm | 54.9% | 4.5% | 223 |
| 9pm–10pm | Limited data | 2 | |
| 10pm–11pm | Limited data | 5 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PIT to ORD
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 66.9% | -15.3 pts | 5.3% | 131 |
| Christmas & New Year (Dec 20 - Jan 3) | 79.2% | -3.0 pts | 0.0% | 255 |
| Summer peak (Jun 15 - Aug 15) | 76.2% | -6.0 pts | 2.2% | 1,412 |
| All other days | 82.2% | — | 1.4% | 5,493 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).