Historical on-time performance
Chicago to Miami
1,182 miData through Dec 2025Source: US DOT · BTS
Flights on MDW–MIA arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 415 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.
- Southwest AirlinesOn-time76%Medianon timep9040 minCancel0.5%Flights385
- Frontier AirlinesOn-time63%Medianon timep90120 minCancel3.3%Flights30
Why flights run late
Delay causes
- Airline38%
- Weather1%
- Air traffic (NAS)24%
- Late aircraft38%
- 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 MDW → MIA
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 56% to 79% on time.
- Mornings79% on time · p90 35 min · 1,001 flights
- Middays76% on time · p90 55 min · 353 flights
- Overnights69% on time · p90 55 min · 334 flights
- Evenings68% on time · p90 80 min · 592 flights
- Afternoons56% on time · p90 85 min · 196 flights · limited
Best day of week
Tuesdays are the most reliable day to fly this route — 83% on time.
- Tuesdays83% on time · p90 40 min · 296 flights
- Mondays75% on time · p90 60 min · 359 flights
- Wednesdays72% on time · p90 65 min · 300 flights
- Saturdays71% on time · p90 50 min · 434 flights
- Fridays71% on time · p90 60 min · 351 flights
- Thursdays70% on time · p90 55 min · 357 flights
- Sundays68% on time · p90 55 min · 379 flights
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