Historical on-time performance
Chicago to Birmingham
584 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–BHM arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 622 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysbestOn-time95%Medianon timep90on timeCancel0.0%Flights96
- Envoy AirOn-time78%Medianon timep9040 minCancel1.1%Flights472
- SkyWest AirlinesOn-time72%Medianon timep9045 minCancel0.0%Flights54
Why flights run late
Delay causes
- Airline22%
- Weather15%
- Air traffic (NAS)20%
- Late aircraft43%
- 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 → BHM
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 74% to 84% on time.
- Mornings84% on time · p90 20 min · 702 flights
- Middays80% on time · p90 45 min · 493 flights
- Afternoons78% on time · p90 40 min · 480 flights
- Evenings77% on time · p90 40 min · 247 flights
- Overnights74% on time · p90 55 min · 172 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 83% on time.
- Tuesdays83% on time · p90 25 min · 238 flights
- Wednesdays82% on time · p90 35 min · 303 flights
- Mondays81% on time · p90 25 min · 323 flights
- Thursdays80% on time · p90 35 min · 315 flights
- Fridays79% on time · p90 30 min · 327 flights
- Saturdays78% on time · p90 40 min · 258 flights
- Sundays77% on time · p90 40 min · 330 flights
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