Historical on-time performance
St. Louis to Miami
1,068 miData through May 2026Source: US DOT · BTS
Flights on STL–MIA arrive on time 83% of the time over the last 12 months.
On-time rate83%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 1,069 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesbestOn-time87%Medianon timep9015 minCancel1.2%Flights590
- Envoy AirOn-time81%Medianon timep9035 minCancel0.0%Flights37
- Southwest AirlinesOn-time77%Medianon timep9035 minCancel0.5%Flights442
Why flights run late
Delay causes
- Airline33%
- Weather3%
- Air traffic (NAS)25%
- Late aircraft40%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather67%
- Air traffic (NAS)33%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 9 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 STL → MIA
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 · 1,571 flights
- Middays81% on time · p90 30 min · 678 flights
- Evenings70% on time · p90 75 min · 359 flights
- Afternoons66% on time · p90 50 min · 306 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 87% on time.
- Wednesdays87% on time · p90 15 min · 384 flights
- Thursdays87% on time · p90 15 min · 388 flights
- Fridays85% on time · p90 30 min · 388 flights
- Mondays84% on time · p90 20 min · 387 flights
- Tuesdays82% on time · p90 40 min · 389 flights
- Sundays73% on time · p90 40 min · 468 flights
- Saturdays71% on time · p90 50 min · 549 flights
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