Historical on-time performance
Miami to Chicago
Flights on MIA–ORD arrive on time 69% of the time over the last 12 months.
based on 4,334 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.
- United AirlinesOn-time70%Medianon timep9070 minCancel0.8%Flights1,010
- American AirlinesOn-time69%Medianon timep9060 minCancel1.7%Flights3,019
- Spirit AirlinesOn-time55%Medianon timep9070 minCancel6.6%Flights305
Why flights run late
Delay causes
- Airline25%
- Weather8%
- Air traffic (NAS)35%
- Late aircraft32%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline8%
- Weather81%
- Air traffic (NAS)11%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 79 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 MIA → ORD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 86% on time.
- Mornings86% on time · p90 20 min · 3,978 flights
- Middays77% on time · p90 50 min · 2,460 flights
- Overnights72% on time · p90 50 min · 1,583 flights
- Evenings62% on time · p90 75 min · 2,114 flights
- Afternoons62% on time · p90 80 min · 3,163 flights
Best day of week
Tuesdays are the most reliable day to fly this route — 79% on time.
- Tuesdays79% on time · p90 40 min · 1,824 flights
- Wednesdays76% on time · p90 50 min · 1,815 flights
- Saturdays74% on time · p90 50 min · 1,923 flights
- Thursdays73% on time · p90 50 min · 1,914 flights
- Mondays72% on time · p90 60 min · 1,921 flights
- Fridays72% on time · p90 55 min · 1,945 flights
- Sundays66% on time · p90 70 min · 1,956 flights
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