ORD to MDT flight delays
Chicago, IL (ORD) Harrisburg, PA (MDT) · 594 miles
2,061 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
72.67%
Arrived on time
Within 15 minutes of schedule
3.15%
Cancelled
Share of scheduled flights
71 min
When late, late by
Average across delayed arrivals
21 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. Republic Airways arrived on time 14.1 points more often than American Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
Cancellation, not delay, is the risk worth pricing here: 3.15% of scheduled flights never operated. A late flight still gets you there. A cancelled one leaves you rebooking, and on a route with few daily departures that can mean losing a day.
The season swings this route hard. In September it ran 21 points more punctual than in July — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
Flights from Chicago to Harrisburg run late more often than the average route, though not severely.
Which airline should you fly on this route?
Over January 2025 – August 2026, Republic Airways arrived on time most often on ORD to MDT. American Airlines was late most often. Flights ran closest to schedule in September and worst in July.
Every airline on ORD to MDT
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Envoy Air | 716 | 76.83% | 2.79% | 60 min | D |
| United Airlines | 570 | 68.46% | 2.11% | 71 min | D |
| Republic Airways | 293 | 79.64% | 4.44% | 60 min | D |
| SkyWest Airlines | 262 | 68.65% | 3.44% | 81 min | F |
| American Airlines | 220 | 65.55% | 5% | 96 min | F |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
MDT to ORD Harrisburg back to Chicago 75.58% on time DOther routes from Chicago
Common questions
Are flights from Chicago to Harrisburg usually delayed?
72.67% of flights on the ORD to MDT route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airline is most on time from Chicago to Harrisburg?
Republic Airways, at 79.64% on time across 293 flights. The least punctual on the route was American Airlines at 65.55%.
How often are ORD to MDT flights cancelled?
3.15% of scheduled flights did not operate — about 32 in every thousand. That is high enough that cancellation, not delay, is the risk worth planning around.
What is the best month to fly Chicago to Harrisburg?
September, when 82.9% of flights arrived on time. The worst was July at 61.9%.
When ORD to MDT flights are late, how late are they?
About 71 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on ORD to MDT during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →