Historical on-time performance
Chicago to St. Louis
Flights on ORD–STL arrive on time 67% of the time over the last 12 months.
based on 2,779 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Envoy AirOn-time73%Medianon timep9050 minCancel2.2%Flights645
- Republic AirwaysOn-time71%Medianon timep9070 minCancel2.5%Flights323
- United AirlinesOn-time68%Medianon timep9070 minCancel1.4%Flights429
- SkyWest AirlinesOn-time64%Medianon timep9080 minCancel4.2%Flights837
- American AirlinesOn-time63%Medianon timep9080 minCancel2.0%Flights545
Why flights run late
Delay causes
- Airline34%
- Weather11%
- Air traffic (NAS)13%
- Late aircraft42%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline1%
- Weather81%
- Air traffic (NAS)18%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 74 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 → STL
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 61% to 81% on time.
- Middays81% on time · p90 40 min · 1,971 flights
- Mornings81% on time · p90 25 min · 1,711 flights
- Afternoons76% on time · p90 50 min · 2,267 flights
- Evenings62% on time · p90 85 min · 897 flights
- Overnights61% on time · p90 85 min · 1,078 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 78% on time.
- Saturdays78% on time · p90 35 min · 1,012 flights
- Tuesdays78% on time · p90 45 min · 1,111 flights
- Wednesdays77% on time · p90 50 min · 1,121 flights
- Thursdays75% on time · p90 50 min · 1,171 flights
- Mondays74% on time · p90 55 min · 1,170 flights
- Fridays71% on time · p90 60 min · 1,187 flights
- Sundays70% on time · p90 65 min · 1,152 flights
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