Historical on-time performance
Newark to San Juan
1,608 miData through Dec 2025Source: US DOT · BTS
Flights on EWR–SJU arrive on time 66% of the time over the last 12 months.
On-time rate66%arrived within 15 min
p90 delay70 min1 in 10 flights is worse (tail risk)
Cancelled1.5%of scheduled flights
based on 2,159 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time69%Medianon timep9065 minCancel1.4%Flights1,108
- JetBlue AirwaysbestOn-time74%Medianon timep9055 minCancel1.7%Flights637
- Frontier AirlinesOn-time48%Median15 minp90115 minCancel1.7%Flights414
Why flights run late
Delay causes
- Airline40%
- Weather4%
- Air traffic (NAS)27%
- Late aircraft29%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly EWR → SJU
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 55% to 75% on time.
- Mornings75% on time · p90 50 min · 3,257 flights
- Afternoons74% on time · p90 60 min · 298 flights
- Middays65% on time · p90 70 min · 637 flights
- Overnights60% on time · p90 115 min · 1,005 flights
- Evenings55% on time · p90 95 min · 1,474 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 65% to 72% on time.
- Tuesdays72% on time · p90 65 min · 937 flights
- Wednesdays69% on time · p90 60 min · 967 flights
- Mondays68% on time · p90 80 min · 981 flights
- Sundays67% on time · p90 90 min · 948 flights
- Fridays65% on time · p90 75 min · 968 flights
- Saturdays65% on time · p90 80 min · 940 flights
- Thursdays65% on time · p90 80 min · 930 flights
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