Historical on-time performance
Chicago to Decatur
156 miData through May 2026Source: US DOT · BTS
Flights on ORD–DEC arrive on time 67% of the time over the last 12 months.
On-time rate67%arrived within 15 min
p90 delay85 min1 in 10 flights is worse (tail risk)
Cancelled3.7%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-time67%Medianon timep9085 minCancel3.7%Flights627
Why flights run late
Delay causes
- Airline32%
- Weather5%
- Air traffic (NAS)23%
- Late aircraft39%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather87%
- Air traffic (NAS)13%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 23 cancellations with a reported cause (BTS reports causes from June 2003).
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 (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 68% to 79% on time.
- Middays79% on time · p90 55 min · 414 flights
- Mornings77% on time · p90 40 min · 604 flights
- Afternoons68% on time · p90 90 min · 820 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 74% on time.
- Thursdays74% on time · p90 60 min · 309 flights
- Fridays74% on time · p90 60 min · 314 flights
- Mondays74% on time · p90 50 min · 310 flights
- Wednesdays74% on time · p90 70 min · 310 flights
- Tuesdays73% on time · p90 90 min · 160 flights · limited
- Saturdays73% on time · p90 75 min · 161 flights · limited
- Sundays69% on time · p90 70 min · 313 flights
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