Historical on-time performance
Miami to San Juan
1,045 miData through Dec 2025Source: US DOT · BTS
Flights on MIA–SJU arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 2,274 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Frontier AirlinesOn-time75%Medianon timep9055 minCancel2.2%Flights315
- American AirlinesOn-time76%Medianon timep9045 minCancel0.2%Flights1,959
Why flights run late
Delay causes
- Airline40%
- Weather4%
- Air traffic (NAS)12%
- Late aircraft43%
- 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 → SJU
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 20 min · 2,494 flights
- Middays75% on time · p90 50 min · 2,669 flights
- Afternoons69% on time · p90 75 min · 1,219 flights
- Evenings67% on time · p90 70 min · 1,232 flights
- Overnights65% on time · p90 75 min · 616 flights
- Early mornings50% on time · p90 105 min · 66 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 79% on time.
- Tuesdays79% on time · p90 40 min · 1,118 flights
- Wednesdays79% on time · p90 40 min · 1,106 flights
- Mondays78% on time · p90 45 min · 1,219 flights
- Thursdays76% on time · p90 55 min · 1,202 flights
- Fridays75% on time · p90 50 min · 1,232 flights
- Sundays73% on time · p90 55 min · 1,235 flights
- Saturdays73% on time · p90 60 min · 1,184 flights
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