San Juan (SJU) to Philadelphia (PHL): On-Time Performance
Data through May 2026
When you fly SJU to PHL matters as much as anything else about the booking: the route swung from 88% on-time in September 2024 to just 43% in July 2024. Across the full period the route averages 69% on-time against a national 78%. Morning departures also hold up better than evening ones (78% vs 61%), which matters most in the rough months.
- On-time
- 69%
- arrived <15 min late
- Avg delay
- 30 min
- completed flights
- Cancelled
- 2.5%
- Flights/day
- 5.0
- last 12 months
- Duration
- 4h 7m
- scheduled
- Distance
- 1,576 mi
Best airline from SJU to PHL
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 93% | 2 min | 0.0% | 67 |
| American Airlines | 79% | 23 min | 1.7% | 1,154 |
| Spirit Airlines | 78% | 19 min | 3.9% | 560 |
| Frontier Airlines | 58% | 39 min | 2.7% | 1,637 |
Monthly on-time trend
Best time to fly from SJU to PHL
Aim for departures around 5 a.m. (90% on-time); avoid 12 a.m. departures (42%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 66% | 44 min |
| Tuesday | 68% | 24 min |
| Wednesdaybest | 73% | 23 min |
| Thursday | 69% | 28 min |
| Friday | 68% | 30 min |
| Saturday | 72% | 29 min |
| Sunday | 67% | 28 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft41%
- Airline operations44%
- National airspace system15%
- Weather1%
Frequently asked questions
- How often are flights from SJU to PHL delayed?
- 31% of SJU–PHL 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 30 minutes.
- Which airline is most reliable from SJU to PHL?
- JetBlue Airways has the best on-time record on this route at 93%, based on 67 flights. 4 airlines flew SJU–PHL frequently enough to compare in this period.
- What is the best time of day to fly from SJU to PHL?
- Departures around 5 a.m. have the best record (90% on-time), while departures around 12 a.m. have the worst (42%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJU to PHL?
- The scheduled SJU–PHL flight time averages 4h 7m over 1,576 miles. Actual arrival times vary — flights on this route land 15+ minutes late 31% of the time.
- How often are SJU to PHL 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 SJU to PHL?
- July 2024 was the roughest month in this dataset, with only 43% of arrivals on time. The best was September 2024 at 88%. If your dates are flexible, that 45-point gap is worth planning around.
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Based on 3,418 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.