Historical on-time performance
Miami to San Juan
1,045 miData through May 2026Source: US DOT · BTS
Flights on MIA–SJU arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 2,359 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesbestOn-time76%Medianon timep9050 minCancel0.6%Flights2,048
- Frontier AirlinesOn-time67%Medianon timep9085 minCancel2.5%Flights280
- Spirit AirlinesOn-time32%Median35 minp90185 minCancel12.9%Flights31
Why flights run late
Delay causes
- Airline41%
- Weather3%
- Air traffic (NAS)15%
- Late aircraft40%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline29%
- Weather42%
- Air traffic (NAS)29%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 24 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 → SJU
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 — 87% on time.
- Mornings87% on time · p90 20 min · 2,567 flights
- Middays73% on time · p90 50 min · 2,583 flights
- Afternoons69% on time · p90 85 min · 1,346 flights
- Evenings65% on time · p90 70 min · 1,174 flights
- Overnights65% on time · p90 80 min · 546 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 80% on time.
- Wednesdays80% on time · p90 35 min · 1,077 flights
- Tuesdays78% on time · p90 45 min · 1,085 flights
- Mondays77% on time · p90 50 min · 1,226 flights
- Fridays75% on time · p90 55 min · 1,248 flights
- Thursdays74% on time · p90 55 min · 1,218 flights
- Saturdays70% on time · p90 65 min · 1,182 flights
- Sundays70% on time · p90 65 min · 1,246 flights
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