OnTimeStats

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 Airlinesbest
    On-time85%
    Medianon time
    p9025 min
    Cancel1.0%
    Flights403
  • Southwest Airlines
    On-time78%
    Medianon time
    p9040 min
    Cancel0.7%
    Flights457
  • Envoy Air
    On-time78%
    Medianon time
    p9050 min
    Cancel2.0%
    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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Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.