Historical on-time performance
Miami to St. Thomas
1,107 miData through May 2026Source: US DOT · BTS
Flights on MIA–STT arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 941 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesOn-time76%Medianon timep9040 minCancel0.7%Flights941
Why flights run late
Delay causes
- Airline40%
- Weather7%
- Air traffic (NAS)28%
- Late aircraft25%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather57%
- Air traffic (NAS)43%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 7 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 → STT
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 — 91% on time.
- Mornings91% on time · p90 5 min · 542 flights
- Middays75% on time · p90 40 min · 2,108 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 83% on time.
- Wednesdays83% on time · p90 25 min · 356 flights
- Tuesdays83% on time · p90 25 min · 357 flights
- Fridays79% on time · p90 35 min · 390 flights
- Thursdays79% on time · p90 35 min · 386 flights
- Mondays78% on time · p90 45 min · 384 flights
- Sundays76% on time · p90 35 min · 390 flights
- Saturdays72% on time · p90 45 min · 418 flights
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