Historical on-time performance
Miami to St. Louis
1,068 miData through May 2026Source: US DOT · BTS
Flights on MIA–STL arrive on time 69% of the time over the last 12 months.
On-time rate69%arrived within 15 min
p90 delay70 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 1,066 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Envoy AirOn-time86%Medianon timep9015 minCancel0.0%Flights37
- American AirlinesbestOn-time71%Medianon timep9070 minCancel1.2%Flights587
- Southwest AirlinesOn-time64%Medianon timep9075 minCancel0.5%Flights442
Why flights run late
Delay causes
- Airline30%
- Weather3%
- Air traffic (NAS)10%
- Late aircraft57%
- 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 MIA → STL
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 — 92% on time.
- Mornings92% on time · p90 10 min · 297 flights
- Middays80% on time · p90 25 min · 299 flights
- Afternoons72% on time · p90 50 min · 892 flights
- Overnights67% on time · p90 70 min · 1,138 flights
- Evenings57% on time · p90 80 min · 319 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 63% to 77% on time.
- Tuesdays77% on time · p90 45 min · 389 flights
- Wednesdays75% on time · p90 40 min · 383 flights
- Fridays72% on time · p90 50 min · 389 flights
- Mondays72% on time · p90 60 min · 387 flights
- Saturdays71% on time · p90 60 min · 543 flights
- Thursdays70% on time · p90 75 min · 386 flights
- Sundays63% on time · p90 70 min · 468 flights
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