Historical on-time performance
Decatur to Chicago
156 miData through May 2026Source: US DOT · BTS
Flights on DEC–ORD arrive on time 65% of the time over the last 12 months.
On-time rate65%arrived within 15 min
p90 delay80 min1 in 10 flights is worse (tail risk)
Cancelled4.8%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-time65%Medianon timep9080 minCancel4.8%Flights627
Why flights run late
Delay causes
- Airline40%
- Weather8%
- Air traffic (NAS)13%
- Late aircraft39%
- Security0%
Most delay minutes here are attributed to Airline.
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 30 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 DEC → ORD
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 57% to 80% on time.
- Mornings80% on time · p90 80 min · 729 flights
- Afternoons79% on time · p90 60 min · 414 flights
- Middays77% on time · p90 80 min · 242 flights
- Evenings57% on time · p90 90 min · 493 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 77% on time.
- Mondays77% on time · p90 65 min · 310 flights
- Wednesdays76% on time · p90 90 min · 310 flights
- Tuesdays74% on time · p90 85 min · 160 flights · limited
- Fridays73% on time · p90 75 min · 314 flights
- Saturdays72% on time · p90 75 min · 162 flights · limited
- Thursdays72% on time · p90 70 min · 309 flights
- Sundays69% on time · p90 105 min · 313 flights
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