Historical on-time performance
San Juan to Miami
1,045 miData through May 2026Source: US DOT · BTS
Flights on SJU–MIA arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 2,390 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesbestOn-time77%Medianon timep9055 minCancel0.8%Flights2,049
- Frontier AirlinesOn-time71%Medianon timep9065 minCancel2.9%Flights280
- Spirit AirlinesOn-time69%Medianon timep9055 minCancel3.3%Flights61
Why flights run late
Delay causes
- Airline37%
- Weather2%
- Air traffic (NAS)6%
- Late aircraft54%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline38%
- Weather35%
- Air traffic (NAS)27%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 26 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 SJU → MIA
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 — 89% on time.
- Mornings89% on time · p90 10 min · 1,615 flights
- Middays80% on time · p90 40 min · 2,772 flights
- Overnights70% on time · p90 90 min · 599 flights
- Evenings65% on time · p90 85 min · 1,646 flights
- Afternoons65% on time · p90 70 min · 1,572 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 80% on time.
- Wednesdays80% on time · p90 35 min · 1,078 flights
- Tuesdays77% on time · p90 55 min · 1,099 flights
- Fridays77% on time · p90 50 min · 1,249 flights
- Mondays75% on time · p90 60 min · 1,229 flights
- Thursdays74% on time · p90 55 min · 1,205 flights
- Saturdays73% on time · p90 65 min · 1,182 flights
- Sundays71% on time · p90 65 min · 1,246 flights
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