Historical on-time performance
Miami to Chicago
1,182 miData through May 2026Source: US DOT · BTS
Flights on MIA–MDW arrive on time 70% of the time over the last 12 months.
On-time rate70%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled2.1%of scheduled flights
based on 380 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time70%Medianon timep9045 minCancel2.1%Flights380
Why flights run late
Delay causes
- Airline48%
- Weather5%
- Air traffic (NAS)21%
- Late aircraft26%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather75%
- Air traffic (NAS)25%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 8 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 → MDW
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 15 min · 865 flights
- Afternoons71% on time · p90 60 min · 420 flights
- Middays70% on time · p90 60 min · 360 flights
- Overnights59% on time · p90 110 min · 138 flights · limited
- Evenings54% on time · p90 80 min · 500 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 78% on time.
- Wednesdays78% on time · p90 40 min · 251 flights
- Tuesdays78% on time · p90 35 min · 246 flights
- Mondays74% on time · p90 60 min · 347 flights
- Fridays71% on time · p90 55 min · 339 flights
- Thursdays71% on time · p90 65 min · 330 flights
- Sundays70% on time · p90 75 min · 349 flights
- Saturdays67% on time · p90 55 min · 421 flights
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