Historical on-time performance
Chicago to Decatur
156 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–DEC arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled1.8%of scheduled flights
based on 627 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesOn-time76%Medianon timep9065 minCancel1.8%Flights627
Why flights run late
Delay causes
- Airline35%
- Weather10%
- Air traffic (NAS)24%
- Late aircraft30%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly ORD → DEC
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 61% to 79% on time.
- Middays79% on time · p90 50 min · 457 flights
- Mornings78% on time · p90 40 min · 496 flights
- Afternoons74% on time · p90 60 min · 861 flights
- Evenings61% on time · p90 70 min · 61 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 79% on time.
- Tuesdays79% on time · p90 50 min · 160 flights · limited
- Mondays78% on time · p90 35 min · 312 flights
- Saturdays77% on time · p90 60 min · 159 flights · limited
- Thursdays77% on time · p90 55 min · 308 flights
- Wednesdays76% on time · p90 65 min · 313 flights
- Fridays75% on time · p90 45 min · 311 flights
- Sundays71% on time · p90 70 min · 312 flights
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