Philadelphia (PHL) to San Juan (SJU): On-Time Performance
Data through July 2026
When you fly PHL to SJU matters as much as anything else about the booking: the route swung from 93% on-time in September 2024 to just 44% in July 2025. Across the full period the route averages 64% on-time against a national 78%. Morning departures also hold up better than evening ones (72% vs 58%), which matters most in the rough months.
- On-time
- 64%
- arrived <15 min late
- Avg delay
- 30 min
- completed flights
- Cancelled
- 2.5%
- Flights/day
- 5.3
- last 12 months
- Duration
- 3h 54m
- scheduled
- Distance
- 1,576 mi
Best airline from PHL to SJU
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 71% | 30 min | 2.3% | 128 |
| American Airlines | 70% | 28 min | 1.3% | 1,245 |
| Spirit Airlines | 66% | 25 min | 4.2% | 529 |
| Frontier Airlines | 59% | 32 min | 2.9% | 1,748 |
Monthly on-time trend
Best time to fly from PHL to SJU
Aim for departures around 8 a.m. (79% on-time); avoid 2 p.m. departures (48%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 62% | 35 min |
| Tuesdaybest | 69% | 30 min |
| Wednesday | 68% | 24 min |
| Thursday | 63% | 29 min |
| Friday | 65% | 35 min |
| Saturday | 63% | 23 min |
| Sunday | 63% | 30 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft31%
- Airline operations40%
- National airspace system24%
- Weather4%
Frequently asked questions
- How often are flights from PHL to SJU delayed?
- 36% of PHL–SJU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 30 minutes.
- Which airline is most reliable from PHL to SJU?
- JetBlue Airways has the best on-time record on this route at 71%, based on 128 flights. 4 airlines flew PHL–SJU frequently enough to compare in this period.
- What is the best time of day to fly from PHL to SJU?
- Departures around 8 a.m. have the best record (79% on-time), while departures around 2 p.m. have the worst (48%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PHL to SJU?
- The scheduled PHL–SJU flight time averages 3h 54m over 1,576 miles. Actual arrival times vary — flights on this route land 15+ minutes late 36% of the time.
- How often are PHL to SJU flights cancelled?
- 2.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from PHL to SJU?
- July 2025 was the roughest month in this dataset, with only 44% of arrivals on time. The best was September 2024 at 93%. If your dates are flexible, that 49-point gap is worth planning around.
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Based on 3,650 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.