Historical on-time performance
Philadelphia to San Juan
1,576 miData through May 2026Source: US DOT · BTS
Flights on PHL–SJU arrive on time 60% of the time over the last 12 months.
On-time rate60%arrived within 15 min
p90 delay80 min1 in 10 flights is worse (tail risk)
Cancelled2.9%of scheduled flights
based on 1,644 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- JetBlue AirwaysOn-time80%Medianon timep9035 minCancel0.0%Flights61
- American AirlinesbestOn-time67%Medianon timep9080 minCancel2.2%Flights648
- Frontier AirlinesOn-time54%Median5 minp9085 minCancel3.6%Flights844
- Spirit AirlinesOn-time49%Median10 minp9085 minCancel4.4%Flights91
Why flights run late
Delay causes
- Airline37%
- Weather4%
- Air traffic (NAS)27%
- Late aircraft31%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline23%
- Weather67%
- Air traffic (NAS)10%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 48 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 PHL → 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 — 71% on time.
- Mornings71% on time · p90 45 min · 1,551 flights
- Middays65% on time · p90 70 min · 690 flights
- Overnights60% on time · p90 75 min · 1,307 flights
- Evenings54% on time · p90 105 min · 871 flights
- Afternoons46% on time · p90 95 min · 454 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 58% to 67% on time.
- Tuesdays67% on time · p90 60 min · 606 flights
- Wednesdays64% on time · p90 55 min · 630 flights
- Fridays62% on time · p90 90 min · 755 flights
- Saturdays61% on time · p90 70 min · 707 flights
- Thursdays61% on time · p90 75 min · 722 flights
- Mondays59% on time · p90 75 min · 722 flights
- Sundays58% on time · p90 85 min · 731 flights
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