Historical on-time performance
Chicago to Chattanooga
501 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–CHA arrive on time 68% of the time over the last 12 months.
On-time rate68%arrived within 15 min
p90 delay70 min1 in 10 flights is worse (tail risk)
Cancelled3.4%of scheduled flights
based on 527 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysOn-time61%Medianon timep9090 minCancel4.8%Flights147
- SkyWest AirlinesbestOn-time71%Medianon timep9060 minCancel2.9%Flights380
Why flights run late
Delay causes
- Airline38%
- Weather11%
- Air traffic (NAS)15%
- Late aircraft36%
- 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 → CHA
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 69% to 78% on time.
- Mornings78% on time · p90 35 min · 698 flights
- Overnights75% on time · p90 45 min · 518 flights
- Middays75% on time · p90 45 min · 246 flights
- Afternoons73% on time · p90 50 min · 672 flights
- Evenings69% on time · p90 60 min · 465 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 66% to 78% on time.
- Saturdays78% on time · p90 35 min · 328 flights
- Tuesdays77% on time · p90 45 min · 389 flights
- Mondays76% on time · p90 45 min · 381 flights
- Thursdays75% on time · p90 45 min · 374 flights
- Wednesdays75% on time · p90 50 min · 395 flights
- Fridays73% on time · p90 45 min · 379 flights
- Sundays66% on time · p90 55 min · 353 flights
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