Chicago (ORD) to Harrisburg (MDT): On-Time Performance
Data through July 2026
When you fly ORD to MDT matters as much as anything else about the booking: the route swung from 86% on-time in September 2024 to just 62% in July 2025. Across the full period the route averages 74% on-time against a national 78%. Morning departures also hold up better than evening ones (78% vs 68%), which matters most in the rough months.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 19 min
- completed flights
- Cancelled
- 2.4%
- Flights/day
- 5.8
- last 12 months
- Duration
- 1h 58m
- scheduled
- Distance
- 594 mi
Best airline from ORD to MDT
5 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airwaysmost reliable | 82% | 11 min | 2.8% | 503 |
| Envoy Air | 77% | 15 min | 2.3% | 854 |
| SkyWest Airlines | 72% | 20 min | 2.4% | 670 |
| United Airlines | 70% | 22 min | 1.7% | 1,034 |
| American Airlines | 67% | 34 min | 4.5% | 264 |
Monthly on-time trend
Best time to fly from ORD to MDT
Aim for departures around 8 a.m. (85% on-time); avoid 7 p.m. departures (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 20 min |
| Tuesday | 74% | 18 min |
| Wednesday | 75% | 19 min |
| Thursday | 76% | 17 min |
| Friday | 72% | 19 min |
| Saturdaybest | 77% | 16 min |
| Sunday | 67% | 25 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft45%
- Airline operations29%
- National airspace system18%
- Weather8%
Frequently asked questions
- How often are flights from ORD to MDT delayed?
- 26% of ORD–MDT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 19 minutes.
- Which airline is most reliable from ORD to MDT?
- Republic Airways has the best on-time record on this route at 82%, based on 503 flights. 5 airlines flew ORD–MDT frequently enough to compare in this period.
- What is the best time of day to fly from ORD to MDT?
- Departures around 8 a.m. have the best record (85% on-time), while departures around 7 p.m. have the worst (62%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ORD to MDT?
- The scheduled ORD–MDT flight time averages 1h 58m over 594 miles. Actual arrival times vary — flights on this route land 15+ minutes late 26% of the time.
- How often are ORD to MDT flights cancelled?
- 2.4% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from ORD to MDT?
- July 2025 was the roughest month in this dataset, with only 62% of arrivals on time. The best was September 2024 at 86%. If your dates are flexible, that 24-point gap is worth planning around.
Explore related pages
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Related guides
Based on 3,325 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.