Best Time to Fly MDT to ORD: On-Time Stats by Hour & Airline
Harrisburg International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 75.4% of Harrisburg (MDT) to Chicago (ORD) flights arrived on time (2,131 scheduled flights). That is 2.3 points below the national average of 77.6%.
Among 5 airlines, Republic Airways led with 86.0% on time and SkyWest Airlines was last with 65.4%.
Over 24 months, Monday was the most reliable day (79% on time) and December the worst month (58%).
The cancellation rate was 3.1% (US average 1.8%).
MDT 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 | 86.0% | 64 min | 2.3% | 354 |
| Envoy Air | 75.8% | 81 min | 2.7% | 626 |
| United Airlines | 75.0% | 72 min | 3.0% | 602 |
| American Airlines | 71.2% | 128 min | 4.5% | 264 |
| SkyWest Airlines | 65.4% | 125 min | 4.2% | 285 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDT to ORD
On-time arrival % by scheduled departure hour (local time), 3,241 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 93.9% | 2.0% | 150 |
| 6am–7am | 86.8% | 1.8% | 916 |
| 7am–8am | 90.2% | 1.6% | 63 |
| 8am–9am | 90.5% | 0.0% | 126 |
| 9am–10am | Limited data | 28 | |
| 10am–11am | 72.8% | 1.6% | 309 |
| 11am–12pm | 84.0% | 1.5% | 337 |
| 12pm–1pm | 70.6% | 3.7% | 54 |
| 1pm–2pm | Limited data | 15 | |
| 2pm–3pm | 54.0% | 7.1% | 42 |
| 3pm–4pm | 69.1% | 2.4% | 83 |
| 4pm–5pm | 66.7% | 2.5% | 80 |
| 5pm–6pm | 64.7% | 2.3% | 695 |
| 6pm–7pm | 59.5% | 5.6% | 198 |
| 7pm–8pm | 58.0% | 4.2% | 72 |
| 8pm–9pm | 59.1% | 9.6% | 73 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MDT 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) | 63.0% | -14.3 pts | 10.0% | 60 |
| Christmas & New Year (Dec 20 - Jan 3) | 66.3% | -11.0 pts | 2.3% | 86 |
| Summer peak (Jun 15 - Aug 15) | 75.8% | -1.5 pts | 2.8% | 599 |
| All other days | 77.3% | — | 2.1% | 2,496 |
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).