Philadelphia (PHL) to San Juan (SJU): On-Time Performance
Data through May 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 June 2024. Across the full period the route averages 64% on-time against a national 78%. Morning departures also hold up better than evening ones (71% vs 58%), which matters most in the rough months.
- On-time
- 64%
- arrived <15 min late
- Avg delay
- 29 min
- completed flights
- Cancelled
- 2.5%
- Flights/day
- 5.0
- last 12 months
- Duration
- 3h 53m
- scheduled
- Distance
- 1,576 mi
Best airline from PHL to SJU
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 79% | 38 min | 0.0% | 67 |
| American Airlines | 70% | 27 min | 1.4% | 1,154 |
| Spirit Airlines | 66% | 25 min | 4.3% | 559 |
| Frontier Airlines | 58% | 32 min | 2.7% | 1,640 |
Monthly on-time trend
Best time to fly from PHL to SJU
Aim for departures around 12 p.m. (79% on-time); avoid 2 p.m. departures (48%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 61% | 32 min |
| Tuesdaybest | 70% | 29 min |
| Wednesday | 66% | 27 min |
| Thursday | 62% | 29 min |
| Friday | 64% | 34 min |
| Saturday | 63% | 23 min |
| Sunday | 61% | 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 aircraft32%
- Airline operations38%
- National airspace system26%
- 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 2024-06 and 2026-05. The average arrival delay across completed flights was 29 minutes.
- Which airline is most reliable from PHL to SJU?
- JetBlue Airways has the best on-time record on this route at 79%, based on 67 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 12 p.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 53m 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 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What is the worst month to fly from PHL to SJU?
- June 2024 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 3,420 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.