Historical on-time performance
St. Louis to Miami
1,068 miData through Dec 2025Source: US DOT · BTS
Flights on STL–MIA arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 958 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesbestOn-time85%Medianon timep9025 minCancel1.0%Flights403
- Southwest AirlinesOn-time78%Medianon timep9040 minCancel0.7%Flights457
- Envoy AirOn-time78%Medianon timep9050 minCancel2.0%Flights98
Why flights run late
Delay causes
- Airline31%
- Weather8%
- Air traffic (NAS)24%
- Late aircraft37%
- 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 STL → MIA
All airlines · rolling 36 months (2023-01 .. 2025-12).
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 · 1,508 flights
- Middays79% on time · p90 35 min · 606 flights
- Evenings65% on time · p90 75 min · 353 flights
- Afternoons65% on time · p90 50 min · 308 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 85% on time.
- Thursdays85% on time · p90 20 min · 367 flights
- Wednesdays84% on time · p90 25 min · 365 flights
- Mondays83% on time · p90 25 min · 374 flights
- Fridays83% on time · p90 30 min · 369 flights
- Tuesdays82% on time · p90 40 min · 370 flights
- Sundays72% on time · p90 40 min · 452 flights
- Saturdays71% on time · p90 50 min · 517 flights
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