Best Time to Fly ORD to PIT: On-Time Stats by Hour & Airline
Chicago O'Hare International → Pittsburgh International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 74.8% of Chicago (ORD) to Pittsburgh (PIT) flights arrived on time (4,000 scheduled flights). That is 2.8 points below the national average of 77.6%.
Envoy Air was the most punctual of the 5 airlines on the route at 83.0%, while American Airlines trailed at 55.0%.
September has been the best month (85% on time) and Friday the weakest day of the week (73%).
2.2% of flights were cancelled, versus 1.8% nationally.
ORD to PIT 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 |
|---|---|---|---|---|
| Envoy Air | 83.0% | 64 min | 2.1% | 186 |
| Republic Airways | 81.5% | 80 min | 2.5% | 1,674 |
| United Airlines | 75.4% | 67 min | 1.3% | 1,294 |
| SkyWest Airlines | 68.8% | 66 min | 3.3% | 242 |
| American Airlines | 55.0% | 99 min | 3.1% | 604 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to PIT
On-time arrival % by scheduled departure hour (local time), 7,286 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 4 | |
| 7am–8am | 87.8% | 0.6% | 701 |
| 8am–9am | 86.1% | 0.9% | 460 |
| 9am–10am | 83.7% | 0.3% | 320 |
| 10am–11am | 83.4% | 0.7% | 762 |
| 11am–12pm | 80.4% | 1.9% | 52 |
| 12pm–1pm | 83.1% | 0.7% | 561 |
| 1pm–2pm | 72.0% | 1.7% | 353 |
| 2pm–3pm | 75.1% | 0.8% | 876 |
| 3pm–4pm | 71.1% | 2.3% | 347 |
| 4pm–5pm | 69.0% | 1.4% | 144 |
| 5pm–6pm | 63.8% | 3.1% | 291 |
| 6pm–7pm | 65.8% | 1.4% | 1,199 |
| 7pm–8pm | 76.3% | 3.5% | 144 |
| 8pm–9pm | 60.0% | 4.9% | 205 |
| 9pm–10pm | 78.6% | 3.4% | 851 |
| 10pm–11pm | Limited data | 13 | |
| 11pm–12am | Limited data | 3 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD to PIT
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) | 65.6% | -12.8 pts | 6.2% | 130 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.3% | -3.1 pts | 0.4% | 256 |
| Summer peak (Jun 15 - Aug 15) | 70.4% | -8.0 pts | 2.6% | 1,412 |
| All other days | 78.3% | — | 1.2% | 5,488 |
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).