Historical on-time performance
Chicago to Harrisburg
594 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–MDT arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.8%of scheduled flights
based on 1,193 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Republic AirwaysOn-time83%Medianon timep9025 minCancel2.8%Flights107
- SkyWest AirlinesOn-time78%Medianon timep9025 minCancel0.9%Flights114
- Envoy AirOn-time75%Medianon timep9050 minCancel2.5%Flights605
- United AirlinesOn-time72%Medianon timep9075 minCancel0.5%Flights367
Why flights run late
Delay causes
- Airline25%
- Weather8%
- Air traffic (NAS)18%
- Late aircraft48%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly ORD → MDT
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 68% to 81% on time.
- Middays81% on time · p90 35 min · 736 flights
- Mornings81% on time · p90 30 min · 702 flights
- Afternoons75% on time · p90 45 min · 650 flights
- Evenings70% on time · p90 65 min · 1,085 flights
- Overnights68% on time · p90 65 min · 225 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 68% to 79% on time.
- Tuesdays79% on time · p90 40 min · 488 flights
- Fridays79% on time · p90 35 min · 485 flights
- Mondays78% on time · p90 45 min · 505 flights
- Saturdays76% on time · p90 55 min · 454 flights
- Wednesdays75% on time · p90 45 min · 484 flights
- Thursdays75% on time · p90 50 min · 485 flights
- Sundays68% on time · p90 65 min · 498 flights
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