Historical on-time performance
Miami to St. Louis
1,068 miData through Dec 2025Source: 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 delay65 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 955 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Envoy AirbestOn-time85%Medianon timep9020 minCancel1.0%Flights98
- American AirlinesOn-time64%Medianon timep9075 minCancel1.0%Flights400
- Southwest AirlinesOn-time70%Medianon timep9065 minCancel0.4%Flights457
Why flights run late
Delay causes
- Airline26%
- Weather4%
- Air traffic (NAS)16%
- Late aircraft54%
- 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 MIA → STL
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 — 88% on time.
- Mornings88% on time · p90 15 min · 172 flights · limited
- Middays77% on time · p90 30 min · 364 flights
- Afternoons71% on time · p90 50 min · 878 flights
- Overnights67% on time · p90 70 min · 1,138 flights
- Evenings58% on time · p90 80 min · 255 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 63% to 75% on time.
- Tuesdays75% on time · p90 45 min · 370 flights
- Wednesdays73% on time · p90 45 min · 364 flights
- Mondays72% on time · p90 60 min · 374 flights
- Fridays70% on time · p90 50 min · 370 flights
- Saturdays69% on time · p90 55 min · 511 flights
- Thursdays69% on time · p90 65 min · 366 flights
- Sundays63% on time · p90 70 min · 452 flights
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